exam simu

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
typedef long long int llint;

int **allocMat(int rows, int cols) {
  int **mat = (int**)malloc(sizeof(int*) * rows);
  for (int i = 0; i < rows; i++) {
    mat[i] = (int*)malloc(sizeof(int) * cols);
  }
  return mat;
}

void readMatElems(int **mat, int rows, int cols) {
  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
      scanf("%d", &mat[i][j]);
    }
  }
}

int **readMat(int *rows, int *cols) {
  scanf("%d %d", rows, cols);
  int **mat = allocMat(*rows, *cols);
  readMatElems(mat, *rows, *cols);
  return mat;
}

llint sumOnRow(int **mat, int targetRow, int cols) {
  llint sum = 0;
  for (int j = 0; j < cols; j++) {
    sum += mat[targetRow][j];
  }
  return sum;
}

void sortMatLines(int **mat, int rows, int cols) {
  bool sorted;
  do {
    sorted = true;
    for (int i = 1; i < rows; i++) {
      if (sumOnRow(mat, i - 1, cols) > sumOnRow(mat, i, cols)) {
        int *aux = mat[i - 1];
        mat[i - 1] = mat[i];
        mat[i] = aux;
        sorted = false;
      }
    }
  } while(!sorted);
}

llint sumOnCol(int **mat, int targetCol, int rows) {
  llint sum = 0;
  for (int i = 0; i < rows; i++) {
    sum += mat[i][targetCol];
  }
  return sum;
}

bool colsSorted(int **mat, int rows, int cols) {
  for (int j = 1; j < cols; j++) {
    if (sumOnCol(mat, j - 1, rows) > sumOnCol(mat, j, rows)) {
      return false;
    }
  }
  return true;
}

void displayMat(int **mat, int rows, int cols) {
  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
      printf("%d ", mat[i][j]);
    }
    printf("\n");
  }
}

void freeMat(int **mat, int rows, int cols) {
  for (int i = 0; i < rows; i++) {
    free(mat[i]);
  }
  free(mat);
}

int main(void) {
  int rows, cols, **mat = NULL;
  mat = readMat(&rows, &cols);

  sortMatLines(mat, rows, cols);

  puts("");
  displayMat(mat, rows, cols);

  printf("columns sorted: %s\n", (colsSorted(mat, rows, cols) ? "true" : "false"));

  freeMat(mat, rows, cols);
  return 0;
}