Island Perimeter 求四邻域有几个1的问题

子函数：

int islandPerimeter(int** grid, int gridRowSize, int gridColSize) {int i, j, k=0;for (i = 0; i < gridRowSize; i++){//grid[i] = (int*)malloc(sizeof(int) *  gridRowSize);有就错了for (j = 0; j < gridColSize; j++){k += (grid[i][j] == 1)*((!i || !grid[i - 1][j]) + (i == gridRowSize - 1 || !grid[i + 1][j]) + (!j || !grid[i][j - 1]) + (j == gridColSize - 1 || !grid[i][j + 1]));//很巧妙的方式}}return k;}

主函数：

int main(){int m=2, n=2;int i, j,k;//scanf("%d,%d", &m, &n);int **grid=(int**)malloc(sizeof(int*)*m*n);for (i = 0; i < m; i++)grid[i] = (int*)malloc(sizeof(int) * m);//二维指针指向二维数组，首先。。。for (i = 0; i < m; i++)for (j = 0; j < n; j++)scanf("%d", &grid[i][j]);//我老是忘记写&&&&&&&&&    k = islandPerimeter(grid, m, n);printf("%d", k);system("pause");return 0;}