BUPT-homework/semester1/pset11/2-4-SaddlePoint.c

#include <stdio.h>
#pragma GCC optimize("Ofast, inline")

int main(void) {
  int n, m;
  scanf("%d%d", &n, &m);
  int matrix[n][m];
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      scanf("%d", &matrix[i][j]);
    }
  }

  // Find the saddle point
  int maxrow, max;
  int found = 0, x = 0, y = 0;
  for (int i = 0; i < n && !found; i++) {
    max = matrix[i][0];
    maxrow = 0;
    // Find the largest in row i
    for (int j = 0; j < m; j++) {
      if (matrix[i][j] > max) {
        max = matrix[i][j];
        maxrow = j;
      }
    }
    // test if is also the min in the column
    found = 1;
    x = i;
    y = maxrow;
    for (int j = 0; j < n; j++) {
      if (matrix[j][maxrow] < max) {
        found = 0;
        break;
      }
    }
  }
  if (found) {
    printf("The saddle point is (%d,%d)=%d.\n", x, y, matrix[x][y]);
  } else {
    printf("There is no saddle point in the matrix.\n");
  }
  return 0;
}