【leetcode】三维形体投影面积

int projectionArea(int** grid, int gridSize, int* gridColSize){
    int sum=0,i,j,count=0;
    int colMax[51] = {0};
    int rowMax[51] = {0};    
    for (i=0; i<gridSize; i++)
    {
        for (j=0; j<gridColSize[i]; j++)
        {
            if (grid[i][j] > colMax[j]) colMax[j] = grid[i][j];    
            if (grid[i][j] > rowMax[i]) rowMax[i] = grid[i][j];
            if (grid[i][j] == 0) count++;
        }
    }
    for (i=0; i<gridSize; i++)
    {
        sum+= colMax[i] + rowMax[i];
    }
    return sum + gridSize*(*gridColSize) - count;
}