BUPT-homework/semester1/pset11/2-3-MatrixAdd.c

#include <stdio.h>
#pragma GCC optimize("O2")
#define MAX 10

int matrixAdd(int matrix[][MAX], int m, int n, int x, int y);

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

  int x, y;
  scanf("%d%d", &x, &y);
  printf("%d\n", matrixAdd(matrix, m, n, x - 1, y - 1));

  return 0;
}

int matrixAdd(int matrix[][MAX], int m, int n, int x, int y) {
  int sum = 0;
  for (int i = -1; i <= 1; i++) {
    for (int j = -1; j <= 1; j++) {
      if (i + x >= 0 && i + x < m && j + y >= 0 && j + y < n &&
          !(i == j && i == 0)) {
        sum += matrix[i + x][j + y];
      }
    }
  }
  return sum;
}