Задача 2. Реверс

#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <iostream>
#include <string>
using namespace std;
using ll = long long;

void change(int col, int raw, vector <vector<int>> &desk, vector <int> &boys, int stepper) {
    //cout << "raw = " << raw << "  col = " << col << '\n';
    raw = desk.size() - raw - 1;
    //cout << "raw = " << raw << "  col = " << col << '\n';
    int yes = stepper; //чей ход
    int no = (stepper + 1) % 2;//кто не ходит
    if (desk[raw][col] == no) boys[no]--;
    desk[raw][col] = yes;
    boys[yes]++;
    //вверх
    bool up = false;
    int upper = -9;
    for (int i = raw - 1; i >= 0; --i) {
        if (desk[i][col] == yes) {
            up = true;
            upper = i;
            break;
        }
    }
    if (up) {
        for (int i = raw - 1; i > upper; --i) {
            if (desk[i][col] == no) boys[no]--;
            desk[i][col] = yes;
            boys[yes]++;
        }
    }
    //вниз
    bool down = false;
    int downer = -9;
    for (int i = raw + 1; i < (int)desk.size(); ++i) {
        if (desk[i][col] == yes) {
            down = true;
            downer = i;
            break;
        }
    }
    if (down) {
        for (int i = raw + 1; i < downer; ++i) {
            if (desk[i][col] == no) boys[no]--;
            desk[i][col] = yes;
            boys[yes]++;
        }
    }
    //влево
    bool left = false;
    int lefter = -9;
    for (int j = col - 1; j >= 0; --j) {
        if (desk[raw][j] == yes) {
            left = true;
            lefter = j;
            break;
        }
    }
    if (left) {
        for (int j = col - 1; j > lefter; --j) {
            if (desk[raw][j] == no) boys[no]--;
            desk[raw][j] = yes;
            boys[yes]++;
        }
    }
    //вправо
    bool right = false;
    int righter = -9;
    for (int j = col + 1; j < (int)desk[0].size(); ++j) {
        if (desk[raw][j] == yes) {
            right = true;
            righter = j;
            break;
        }
    }
    if (right) {
        for (int j = col + 1; j < righter; ++j) {
            if (desk[raw][j] == no) boys[no]--;
            desk[raw][j] = yes;
            boys[yes]++;
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int N, M;//N--размер по горизонтали, M-по вертикали
    cin >> N >> M;
    vector <vector<int>> desk(M, vector <int> (N, -9));
    vector <int> boys(2, 0);
    int stepper = -1;
    while (true) {
        int x, y;
        cin >> x >> y;
        stepper = (stepper + 1) % 2;
        if (x == -1 && y == -1) {
            //exit(0);
            break;
        }
        x--;
        y--;
        change(x, y, desk, boys, stepper);
        int dif = boys[0] - boys[1];
        cout << dif << endl;
        /*cout << "dif = " << dif << '\n';
        cout<<"desk\n";
        for (auto x : desk) {
            for (auto y : x) {
                cout << y << ' ';
            }cout << '\n';
        }cout << '\n';*/
    }
}
//в конце разобраться с flush