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VladNitu
Feb 17th, 2024
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. const int inf = 1e9;
  6. const int maxv = 100;
  7.  
  8. struct Cell {
  9. int x, y;
  10.  
  11. Cell() {
  12. x = y = -1;
  13. }
  14.  
  15. Cell(int _x, int _y) {
  16. x = _x;
  17. y = _y;
  18. }
  19.  
  20. Cell operator+ (const Cell& other) const {
  21. return {x + other.x, y + other.y};
  22. }
  23.  
  24. bool operator ==(const Cell& other) const {
  25. return x == other.x && y == other.y;
  26. }
  27.  
  28. [[nodiscard]] inline bool inRange() const {
  29. if (1 <= x && x <= 8
  30. && 1 <= y && y <= 8)
  31. return true;
  32. return false;
  33. }
  34. };
  35.  
  36. struct Piece {
  37. enum PieceType {
  38. Pawn,
  39. Knight,
  40. Bishop,
  41. Rook,
  42. Queen,
  43. King
  44. };
  45.  
  46. PieceType type;
  47. Cell cell;
  48. char color;
  49.  
  50. Piece () = default;
  51.  
  52. Piece(PieceType _type, Cell _cell, char _color) {
  53. type = _type;
  54. cell = _cell;
  55. color = _color;
  56. }
  57.  
  58. Piece(char c, int x, int y) {
  59. if (isupper(c)) {
  60. color = 'w';
  61. c = tolower(c);
  62. } else {
  63. color = 'b';
  64. }
  65.  
  66. if (c == 'p')
  67. type = Pawn;
  68. else if (c == 'n')
  69. type = Knight;
  70. else if (c == 'b')
  71. type = Bishop;
  72. else if (c == 'r')
  73. type = Rook;
  74. else if (c == 'q')
  75. type = Queen;
  76. else if (c == 'k')
  77. type = King;
  78.  
  79. cell = Cell(x, y);
  80. }
  81.  
  82. struct Directions {
  83. vector<int> dx;
  84. vector<int> dy;
  85. int steps;
  86. };
  87.  
  88. [[nodiscard]] inline static Directions generateDirections(PieceType pieceType) {
  89. if (pieceType == Knight) {
  90. return {vector<int>({2, 2, 1, 1, -1, -1, -2, -2}),
  91. vector<int>({1, -1, 2, -2, 2, -2, 1, -1}),
  92. 1};
  93. } else if (pieceType == Bishop) {
  94. return {vector<int>({-1, -1, 1, 1}),
  95. vector<int>({-1, 1, -1, 1}),
  96. 7
  97. };
  98. } else if (pieceType == Rook) {
  99. return {vector<int>({1, -1, 0, 0}),
  100. vector<int>({0, 0, 1, -1}),
  101. 7
  102. };
  103.  
  104. } else if (pieceType == Queen) {
  105. return {vector<int>({-1, -1, 1, 1, 1, -1, 0, 0}),
  106. vector<int>({-1, 1, -1, 1, 0, 0, 1, -1}),
  107. 7
  108. };
  109. } else if (pieceType == King) {
  110. return {vector<int>({-1, -1, -1, 0, 1, 1, 1, 0}),
  111. vector<int>({-1, 0, 1, 1, 1, 0, -1, -1}),
  112. 1
  113. };
  114. }
  115.  
  116. return {}; // Compiler stops complaining
  117. }
  118.  
  119. [[nodiscard]] inline vector<vector<Cell> > generateMoves() const {
  120. vector<vector<Cell> > allMoves;
  121. if (type == Pawn) {
  122. for (int step = 1; step <= 2; ++step) {
  123. int sgn = (color == 'w' ? 1 : -1);
  124. if (step == 2 &&
  125. ((color == 'w' && cell.x != 2) || (color == 'b' && cell.x != 7)))
  126. continue;
  127. vector<Cell> currMove;
  128. bool illegal = false;
  129. for (int currStep = 1; currStep <= step; ++currStep) {
  130. Cell newCell = cell + Cell(currStep * sgn, 0);
  131. if (!newCell.inRange()) {
  132. illegal = true;
  133. break;
  134. }
  135. currMove.push_back(newCell);
  136. }
  137. if (!illegal) {
  138. allMoves.push_back(currMove);
  139. }
  140. }
  141. } else {
  142. Directions directions = generateDirections(type);
  143. for (int dir = 0; dir < directions.dx.size(); ++dir) {
  144. int dirX = directions.dx[dir];
  145. int dirY = directions.dy[dir];
  146. for (int step = 1; step <= directions.steps; ++step) {
  147. vector<Cell> currMove;
  148. bool illegal = false;
  149. for (int currStep = 1; currStep <= step; ++currStep) {
  150. Cell newCell = cell + Cell(currStep * dirX, currStep * dirY);
  151. if (!newCell.inRange()) {
  152. illegal = true;
  153. break;
  154. }
  155. currMove.push_back(newCell);
  156. }
  157. if (!illegal) {
  158. allMoves.push_back(currMove);
  159. }
  160. }
  161. }
  162. }
  163. return allMoves;
  164. }
  165. };
  166.  
  167. struct BoardState;
  168. string generateFEN(BoardState board, bool includeMoves);
  169.  
  170. struct BoardState {
  171. vector<Piece> pieces;
  172. char activeColor;
  173. char whiteCastling;
  174. char blackCastling;
  175. Cell enPassant;
  176. int halfMoves;
  177. int fullMoves;
  178.  
  179. [[nodiscard]] inline bool isInCheck(char color) const {
  180. Cell kingPosition;
  181. for (const Piece& piece : pieces) {
  182. if (piece.color == color && piece.type == Piece::King) {
  183. kingPosition = piece.cell;
  184. break;
  185. }
  186. }
  187. vector<vector<bool> > attacked = attackedCells(color ^ 'w' ^ 'b');
  188. return attacked[kingPosition.x][kingPosition.y];
  189. }
  190.  
  191. [[nodiscard]] inline bool isDraw() const {
  192. if (halfMoves >= 50 || pieces.size() == 2)
  193. return true;
  194. vector<BoardState> boardStates = generateAllMoves();
  195. if (boardStates.empty() && !isInCheck(activeColor))
  196. return true;
  197. return false;
  198. }
  199.  
  200.  
  201. [[nodiscard]] inline bool isCheckMate() const {
  202. if (!isInCheck(activeColor))
  203. return false;
  204. vector<BoardState> boardStates = generateAllMoves();
  205. return boardStates.empty();
  206. }
  207.  
  208. [[nodiscard]] inline vector<vector<bool> > attackedCells(char color) const {
  209. char b[10][10];
  210. memset(b, 0, sizeof(b));
  211. for (const Piece& piece : pieces) {
  212. b[piece.cell.x][piece.cell.y] = (piece.color == 'w' ? 1 : -1);
  213. }
  214. vector<vector<bool> > isAttacked(9, vector<bool>(9, false));
  215. for (const Piece& piece : pieces) {
  216. if (piece.color != color)
  217. continue;
  218. if (piece.type != Piece::Pawn) {
  219. vector<vector<Cell>> movesPiece = piece.generateMoves();
  220. for (vector<Cell> movesList : movesPiece) {
  221. bool invalid = false;
  222. for (int i = 0; i < movesList.size(); ++i) {
  223. Cell cell = movesList[i];
  224. if (b[cell.x][cell.y] != 0) {
  225. if (i != movesList.size() - 1) {
  226. invalid = true;
  227. break;
  228. } else {
  229. if ((color == 'w' && b[cell.x][cell.y] == 1)
  230. || (color == 'b' && b[cell.x][cell.y] == -1)) {
  231. invalid = true;
  232. break;
  233. }
  234. }
  235. }
  236. }
  237. if (invalid)
  238. continue;
  239. Cell endPosition = movesList.back();
  240. isAttacked[endPosition.x][endPosition.y] = true;
  241. }
  242. } else {
  243. if (piece.color == 'w') {
  244. Cell newCell = piece.cell + Cell(1, -1);
  245. if (newCell.inRange() && b[newCell.x][newCell.y] != 1)
  246. isAttacked[newCell.x][newCell.y] = true;
  247. newCell = piece.cell + Cell(1, 1);
  248. if (newCell.inRange() && b[newCell.x][newCell.y] != 1)
  249. isAttacked[newCell.x][newCell.y] = true;
  250. } else if (piece.color == 'b') {
  251. Cell newCell = piece.cell + Cell(-1, -1);
  252. if (newCell.inRange() && b[newCell.x][newCell.y] != -1)
  253. isAttacked[newCell.x][newCell.y] = true;
  254. newCell = piece.cell + Cell(-1, 1);
  255. if (newCell.inRange() && b[newCell.x][newCell.y] != -1)
  256. isAttacked[newCell.x][newCell.y] = true;
  257. }
  258. }
  259. }
  260. return isAttacked;
  261. }
  262.  
  263. [[nodiscard]] inline vector<BoardState> generateAllMoves() const {
  264. vector<BoardState> newBoards;
  265.  
  266. char newColor = activeColor ^ 'w' ^ 'b';
  267.  
  268. char b[10][10];
  269. memset(b, 0, sizeof(b));
  270. for (const Piece& piece : pieces) {
  271. char p;
  272. if (piece.type == Piece::Pawn) {
  273. p = 'p';
  274. } else if (piece.type == Piece::Knight) {
  275. p = 'n';
  276. } else if (piece.type == Piece::Bishop) {
  277. p = 'b';
  278. } else if (piece.type == Piece::Rook) {
  279. p = 'r';
  280. } else if (piece.type == Piece::Queen) {
  281. p = 'q';
  282. } else if (piece.type == Piece::King) {
  283. p = 'k';
  284. }
  285. if (piece.color == 'w')
  286. p = toupper(p);
  287. b[piece.cell.x][piece.cell.y] = p;
  288. }
  289.  
  290. for (int pieceIdx = 0; pieceIdx < pieces.size(); ++pieceIdx) {
  291. Piece piece = pieces[pieceIdx];
  292. if (piece.color != activeColor)
  293. continue;
  294.  
  295. vector<vector<Cell>> movesPiece = piece.generateMoves();
  296. if (piece.type == Piece::Pawn) {
  297. if (piece.color == 'w') {
  298. Cell newCell = piece.cell + Cell(1, -1);
  299. if (newCell.inRange() && b[newCell.x][newCell.y] != 0 && islower(b[newCell.x][newCell.y]) && b[newCell.x][newCell.y] != 'k')
  300. movesPiece.push_back(vector<Cell>({newCell}));
  301. newCell = piece.cell + Cell(1, 1);
  302. if (newCell.inRange() && b[newCell.x][newCell.y] != 0 && islower(b[newCell.x][newCell.y]) && b[newCell.x][newCell.y] != 'k')
  303. movesPiece.push_back(vector<Cell>({newCell}));
  304. } else if (piece.color == 'b') {
  305. Cell newCell = piece.cell + Cell(-1, -1);
  306. if (newCell.inRange() && b[newCell.x][newCell.y] != 0 && isupper(b[newCell.x][newCell.y]) && b[newCell.x][newCell.y] != 'K')
  307. movesPiece.push_back(vector<Cell>({newCell}));
  308. newCell = piece.cell + Cell(-1, 1);
  309. if (newCell.inRange() && b[newCell.x][newCell.y] != 0 && isupper(b[newCell.x][newCell.y]) && b[newCell.x][newCell.y] != 'K')
  310. movesPiece.push_back(vector<Cell>({newCell}));
  311. }
  312. }
  313. for (vector<Cell> movesList : movesPiece) {
  314. BoardState newBoard;
  315. bool invalid = false;
  316. for (int i = 0; i < movesList.size(); ++i) {
  317. Cell cell = movesList[i];
  318. if (b[cell.x][cell.y] != 0) {
  319. if (i != movesList.size() - 1) {
  320. invalid = true;
  321. break;
  322. } else {
  323. if ((islower(b[cell.x][cell.y]) && activeColor == 'b')
  324. || (isupper(b[cell.x][cell.y]) && activeColor == 'w') || tolower(b[cell.x][cell.y]) == 'k') {
  325. invalid = true;
  326. break;
  327. }
  328. if (piece.type == Piece::Pawn && cell.y == piece.cell.y) {
  329. invalid = true;
  330. break;
  331. }
  332. }
  333. }
  334. }
  335. if (invalid)
  336. continue;
  337. Cell endPosition = movesList.back();
  338. char oldPiece = b[endPosition.x][endPosition.y];
  339. b[endPosition.x][endPosition.y] = 0;
  340. newBoard.pieces = pieces;
  341. newBoard.activeColor = newColor;
  342. newBoard.fullMoves = fullMoves + 1;
  343. // compute newBoard.enPassant
  344. if (piece.type == Piece::Pawn && abs(endPosition.x - piece.cell.x) == 2) {
  345. newBoard.enPassant = piece.cell + Cell((endPosition.x - piece.cell.x) / 2, 0);
  346. } else {
  347. newBoard.enPassant = Cell(-1, -1);
  348. }
  349. // compute newBoard.castling
  350. newBoard.whiteCastling = newBoard.blackCastling = 0;
  351. if (whiteCastling & 1) {
  352. // K
  353. if (b[1][5] == 'K' && b[1][8] == 'R')
  354. newBoard.whiteCastling += 1;
  355. }
  356. if (whiteCastling & 2) {
  357. // Q
  358. if (b[1][5] == 'K' && b[1][1] == 'R')
  359. newBoard.whiteCastling += 2;
  360. }
  361. if (blackCastling & 1) {
  362. // k
  363. if (b[8][5] == 'k' && b[8][8] == 'r')
  364. newBoard.blackCastling += 1;
  365. }
  366. if (blackCastling & 2) {
  367. // q
  368. if (b[8][5] == 'k' && b[8][1] == 'r')
  369. newBoard.blackCastling += 2;
  370. }
  371. b[endPosition.x][endPosition.y] = oldPiece;
  372. if (piece.type == Piece::Pawn || b[endPosition.x][endPosition.y] != 0)
  373. newBoard.halfMoves = 0;
  374. else
  375. newBoard.halfMoves = halfMoves + 1;
  376. newBoard.pieces[pieceIdx].cell = endPosition;
  377. if (b[endPosition.x][endPosition.y] != 0) {
  378. for (int removeIdx = 0; removeIdx < newBoard.pieces.size(); ++removeIdx) {
  379. if (newBoard.pieces[removeIdx].cell == endPosition && newBoard.pieces[removeIdx].color != activeColor) {
  380. std::swap(newBoard.pieces[removeIdx], newBoard.pieces.back());
  381. newBoard.pieces.pop_back();
  382. break;
  383. }
  384. }
  385. }
  386. if (piece.type == Piece::Pawn && (endPosition.x == 1 || endPosition.x == 8)) {
  387. for (auto newPieceType : {Piece::Queen, Piece::Knight, Piece::Bishop, Piece::Rook}) {
  388. newBoard.pieces[pieceIdx].type = newPieceType;
  389. if (!newBoard.isInCheck(activeColor)) {
  390. newBoards.push_back(newBoard);
  391. }
  392. }
  393. } else if (!newBoard.isInCheck(activeColor)) {
  394. newBoards.push_back(newBoard);
  395. }
  396. }
  397. }
  398.  
  399. // implement en passant
  400. if (enPassant.x != -1) {
  401. int upDir = (activeColor == 'w' ? 1 : -1);
  402. for (int dir : {-1, 1}) {
  403. Cell capturePawn = enPassant + Cell(-upDir, dir);
  404. Cell toCapturePawn = enPassant + Cell(-upDir, 0);
  405. if (capturePawn.inRange() &&
  406. ((activeColor == 'w' && b[capturePawn.x][capturePawn.y] == 'P') ||
  407. (activeColor == 'b' && b[capturePawn.x][capturePawn.y] == 'p'))) {
  408. BoardState newBoard;
  409. newBoard.pieces = pieces;
  410. newBoard.activeColor = newColor;
  411. newBoard.whiteCastling = whiteCastling;
  412. newBoard.blackCastling = blackCastling;
  413. newBoard.fullMoves = fullMoves + 1;
  414. newBoard.halfMoves = 0;
  415. newBoard.enPassant = Cell(-1, -1);
  416. for (auto & piece : newBoard.pieces) {
  417. if (piece.cell == capturePawn) {
  418. piece.cell = enPassant;
  419. break;
  420. }
  421. }
  422. for (int pieceIdx = 0; pieceIdx < newBoard.pieces.size(); ++pieceIdx) {
  423. if (newBoard.pieces[pieceIdx].cell == toCapturePawn) {
  424. std::swap(newBoard.pieces[pieceIdx], newBoard.pieces.back());
  425. newBoard.pieces.pop_back();
  426. break;
  427. }
  428. }
  429. if (!isInCheck(activeColor)) {
  430. newBoards.push_back(newBoard);
  431. }
  432. }
  433. }
  434. }
  435. // implement castling
  436. if (activeColor == 'w') {
  437. vector<vector<bool>> attacked = attackedCells(newColor);
  438. if (whiteCastling & 1) {
  439. bool invalid = false;
  440. for (int col = 6; col <= 7; ++col) {
  441. if (b[1][col] != 0) {
  442. invalid = true;
  443. break;
  444. }
  445. }
  446. for (int col = 5; col <= 6; ++col) {
  447. if (attacked[1][col]) {
  448. invalid = true;
  449. break;
  450. }
  451. }
  452. if (!invalid) {
  453. BoardState newBoard;
  454. newBoard.pieces = pieces;
  455. newBoard.activeColor = newColor;
  456. newBoard.whiteCastling = 0;
  457. newBoard.blackCastling = blackCastling;
  458. newBoard.fullMoves = fullMoves + 1;
  459. newBoard.halfMoves = halfMoves + 1;
  460. newBoard.enPassant = Cell(-1, -1);
  461. for (auto & piece : newBoard.pieces) {
  462. if (piece.cell == Cell(1, 5)) {
  463. piece.cell = Cell(1, 7);
  464. break;
  465. }
  466. }
  467. for (auto & piece : newBoard.pieces) {
  468. if (piece.cell == Cell(1, 8)) {
  469. piece.cell = Cell(1, 6);
  470. break;
  471. }
  472. }
  473. if (!isInCheck(activeColor)) {
  474. newBoards.push_back(newBoard);
  475. }
  476. }
  477. }
  478. if (whiteCastling & 2) {
  479. bool invalid = false;
  480. for (int col = 2; col <= 4; ++col) {
  481. if (b[1][col] != 0) {
  482. invalid = true;
  483. break;
  484. }
  485. }
  486. for (int col = 3; col <= 5; ++col) {
  487. if (attacked[1][col]) {
  488. invalid = true;
  489. break;
  490. }
  491. }
  492. if (!invalid) {
  493. BoardState newBoard;
  494. newBoard.pieces = pieces;
  495. newBoard.activeColor = newColor;
  496. newBoard.whiteCastling = 0;
  497. newBoard.blackCastling = blackCastling;
  498. newBoard.fullMoves = fullMoves + 1;
  499. newBoard.halfMoves = halfMoves + 1;
  500. newBoard.enPassant = Cell(-1, -1);
  501. for (auto & piece : newBoard.pieces) {
  502. if (piece.cell == Cell(1, 5)) {
  503. piece.cell = Cell(1, 3);
  504. break;
  505. }
  506. }
  507. for (auto & piece : newBoard.pieces) {
  508. if (piece.cell == Cell(1, 1)) {
  509. piece.cell = Cell(1, 4);
  510. break;
  511. }
  512. }
  513. if (!isInCheck(activeColor)) {
  514. newBoards.push_back(newBoard);
  515. }
  516. }
  517. }
  518. } else {
  519. vector<vector<bool>> attacked = attackedCells(newColor);
  520. if (blackCastling & 1) {
  521. bool invalid = false;
  522. for (int col = 6; col <= 7; ++col) {
  523. if (b[8][col] != 0) {
  524. invalid = true;
  525. break;
  526. }
  527. }
  528. for (int col = 5; col <= 6; ++col) {
  529. if (attacked[8][col]) {
  530. invalid = true;
  531. break;
  532. }
  533. }
  534. if (!invalid) {
  535. BoardState newBoard;
  536. newBoard.pieces = pieces;
  537. newBoard.activeColor = newColor;
  538. newBoard.whiteCastling = 0;
  539. newBoard.blackCastling = blackCastling;
  540. newBoard.fullMoves = fullMoves + 1;
  541. newBoard.halfMoves = halfMoves + 1;
  542. newBoard.enPassant = Cell(-1, -1);
  543. for (auto & piece : newBoard.pieces) {
  544. if (piece.cell == Cell(8, 5)) {
  545. piece.cell = Cell(8, 7);
  546. break;
  547. }
  548. }
  549. for (auto & piece : newBoard.pieces) {
  550. if (piece.cell == Cell(8, 8)) {
  551. piece.cell = Cell(8, 6);
  552. break;
  553. }
  554. }
  555. if (!isInCheck(activeColor)) {
  556. newBoards.push_back(newBoard);
  557. }
  558. }
  559. }
  560. if (blackCastling & 2) {
  561. bool invalid = false;
  562. for (int col = 2; col <= 4; ++col) {
  563. if (b[8][col] != 0) {
  564. invalid = true;
  565. break;
  566. }
  567. }
  568. for (int col = 3; col <= 5; ++col) {
  569. if (attacked[8][col]) {
  570. invalid = true;
  571. break;
  572. }
  573. }
  574. if (!invalid) {
  575. BoardState newBoard;
  576. newBoard.pieces = pieces;
  577. newBoard.activeColor = newColor;
  578. newBoard.whiteCastling = 0;
  579. newBoard.blackCastling = blackCastling;
  580. newBoard.fullMoves = fullMoves + 1;
  581. newBoard.halfMoves = halfMoves + 1;
  582. newBoard.enPassant = Cell(-1, -1);
  583. for (auto & piece : newBoard.pieces) {
  584. if (piece.cell == Cell(8, 5)) {
  585. piece.cell = Cell(8, 3);
  586. break;
  587. }
  588. }
  589. for (auto & piece : newBoard.pieces) {
  590. if (piece.cell == Cell(8, 1)) {
  591. piece.cell = Cell(8, 4);
  592. break;
  593. }
  594. }
  595. if (!isInCheck(activeColor)) {
  596. newBoards.push_back(newBoard);
  597. }
  598. }
  599. }
  600. }
  601. return newBoards;
  602. }
  603. };
  604.  
  605. inline BoardState parseFEN(string fen) {
  606. int currIndex = 0;
  607. BoardState board;
  608. for (int i = 8; i >= 1; --i) {
  609. int pos = 0;
  610. while (pos < 8) {
  611. if (isdigit(fen[currIndex])) {
  612. pos += fen[currIndex] - '0';
  613. } else {
  614. pos++;
  615. board.pieces.emplace_back(fen[currIndex], i, pos);
  616. }
  617. currIndex++;
  618. }
  619. currIndex++;
  620. }
  621.  
  622. board.activeColor = fen[currIndex];
  623. currIndex += 2;
  624.  
  625. board.whiteCastling = board.blackCastling = 0;
  626. while (fen[currIndex] != ' ') {
  627. if (fen[currIndex] == 'K')
  628. board.whiteCastling += 1;
  629. else if (fen[currIndex] == 'Q')
  630. board.whiteCastling += 2;
  631. else if (fen[currIndex] == 'k')
  632. board.blackCastling += 1;
  633. else if (fen[currIndex] == 'q')
  634. board.blackCastling += 2;
  635. currIndex++;
  636. }
  637.  
  638. currIndex++;
  639. if (fen[currIndex] == '-') {
  640. board.enPassant = Cell(-1, -1);
  641. currIndex += 2;
  642. } else {
  643. board.enPassant = Cell(fen[currIndex + 1] - '0', fen[currIndex] - 'a' + 1);
  644. currIndex += 3;
  645. }
  646.  
  647. board.halfMoves = 0;
  648. while (fen[currIndex] != ' ') {
  649. board.halfMoves = board.halfMoves * 10 + fen[currIndex] - '0';
  650. currIndex++;
  651. }
  652. currIndex++;
  653.  
  654. board.fullMoves = 0;
  655. while (currIndex < fen.size()) {
  656. board.fullMoves = board.fullMoves * 10 + fen[currIndex] - '0';
  657. currIndex++;
  658. }
  659.  
  660. return board;
  661. }
  662.  
  663. //string generateFEN(const BoardState& board, bool includeMoves) {
  664. // string fen = "";
  665. // char b[10][10];
  666. // memset(b, 0, sizeof(b));
  667. // for (const Piece& piece : board.pieces) {
  668. // char p;
  669. // if (piece.type == Piece::Pawn) {
  670. // p = 'p';
  671. // } else if (piece.type == Piece::Knight) {
  672. // p = 'n';
  673. // } else if (piece.type == Piece::Bishop) {
  674. // p = 'b';
  675. // } else if (piece.type == Piece::Rook) {
  676. // p = 'r';
  677. // } else if (piece.type == Piece::Queen) {
  678. // p = 'q';
  679. // } else if (piece.type == Piece::King) {
  680. // p = 'k';
  681. // }
  682. // if (piece.color == 'w')
  683. // p = toupper(p);
  684. // b[piece.cell.x][piece.cell.y] = p;
  685. // }
  686. //
  687. // for (int i = 8; i >= 1; --i) {
  688. // int pos = 0;
  689. // for (int j = 1; j <= 8; ++j) {
  690. // if (b[i][j] == 0) {
  691. // pos++;
  692. // } else {
  693. // if (pos > 0) {
  694. // fen += to_string(pos);
  695. // pos = 0;
  696. // }
  697. // fen += b[i][j];
  698. // }
  699. // }
  700. // if (pos != 0)
  701. // fen += to_string(pos);
  702. // if (i == 1) {
  703. // fen += " ";
  704. // } else {
  705. // fen += "/";
  706. // }
  707. // }
  708. //
  709. // fen += board.activeColor;
  710. // fen += " ";
  711. //
  712. // if (board.whiteCastling == 0 && board.blackCastling == 0)
  713. // fen += "-";
  714. // else {
  715. // if (board.whiteCastling & 1) {
  716. // fen += "K";
  717. // }
  718. // if (board.whiteCastling & 2) {
  719. // fen += "Q";
  720. // }
  721. // if (board.blackCastling & 1) {
  722. // fen += "k";
  723. // }
  724. // if (board.blackCastling & 2) {
  725. // fen += "q";
  726. // }
  727. // }
  728. // fen += " ";
  729. //
  730. // if (board.enPassant.x == -1) {
  731. // fen += "-";
  732. // } else {
  733. // fen += ('a' + board.enPassant.y - 1);
  734. // fen += ('0' + board.enPassant.x);
  735. // }
  736. //
  737. // if (includeMoves) {
  738. // fen += " ";
  739. // fen += to_string(board.halfMoves);
  740. // fen += " ";
  741. // fen += to_string(board.fullMoves);
  742. // }
  743. //
  744. // return fen;
  745. //}
  746.  
  747. struct SortedBoards {
  748. BoardState board;
  749. int value{};
  750. };
  751.  
  752. inline int computeBoardScore(const BoardState& board) {
  753. int score = 0;
  754. for (const Piece& piece : board.pieces) {
  755. int value = 0;
  756. if (piece.type == Piece::Pawn) {
  757. value = 1;
  758. } else if (piece.type == Piece::Bishop) {
  759. value = 3;
  760. } else if (piece.type == Piece::Knight) {
  761. value = 3;
  762. } else if (piece.type == Piece::Rook) {
  763. value = 5;
  764. } else if (piece.type == Piece::Queen) {
  765. value = 9;
  766. }
  767. if (piece.color == 'w')
  768. score += value;
  769. else
  770. score -= value;
  771. }
  772. return score;
  773. }
  774.  
  775. inline int alphaBetaMiniMax(const BoardState& board, int depth, int alpha, int beta) {
  776. if (depth >= 6)
  777. return 0;
  778. if (board.isDraw())
  779. return 0;
  780. if (board.isCheckMate()) {
  781. if (board.activeColor == 'w') {
  782. return -maxv + depth;
  783. } else {
  784. return maxv - depth;
  785. }
  786. }
  787. vector<BoardState> generatedBoards = board.generateAllMoves();
  788. vector<SortedBoards> sortedBoards(generatedBoards.size());
  789. for (int i = 0; i < generatedBoards.size(); ++i) {
  790. swap(sortedBoards[i].board, generatedBoards[i]);
  791. sortedBoards[i].value = computeBoardScore(sortedBoards[i].board);
  792. }
  793. if (board.activeColor == 'w') {
  794. int maxEval = -inf;
  795. sort(sortedBoards.begin(), sortedBoards.end(), [](const auto& b1, const auto& b2) {return b1.value > b2.value; });
  796. for (const auto& newBoard : sortedBoards) {
  797. int eval = alphaBetaMiniMax(newBoard.board, depth + 1, alpha, beta);
  798. maxEval = max(maxEval, eval);
  799. alpha = max(alpha, eval);
  800. if (beta <= alpha)
  801. break;
  802. }
  803. return maxEval;
  804. } else {
  805. int minEval = inf;
  806. sort(sortedBoards.begin(), sortedBoards.end(), [](const auto& b1, const auto& b2) {return b1.value < b2.value; });
  807. for (const auto& newBoard : sortedBoards) {
  808. int eval = alphaBetaMiniMax(newBoard.board, depth + 1, alpha, beta);
  809. minEval = min(minEval, eval);
  810. beta = min(beta, eval);
  811. if (beta <= alpha)
  812. break;
  813. }
  814. return minEval;
  815. }
  816. }
  817.  
  818. int main() {
  819. freopen("instances/easy/5.in", "r", stdin);
  820.  
  821. string fen;
  822. getline(cin, fen);
  823. BoardState board = parseFEN(fen);
  824.  
  825. int answer = alphaBetaMiniMax(board, 0, -inf, inf);
  826. if (answer == 0) {
  827. cout << "Draw" << endl;
  828. } else if (answer > 0) {
  829. cout << "W M" << (-answer + maxv + 1) / 2 << endl;
  830. } else {
  831. cout << "B M" << (answer + maxv + 1) / 2 << endl;
  832. }
  833.  
  834. return 0;
  835. }
  836.  
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