[463] Island Perimeter

真是使人開心的題目～（大心）

不過一開始忘記把 == 0 的情境拿掉了 XD

int islandPerimeter(int** grid, int gridSize, int* gridColSize){

int perimeter=0;

for (int i=0;i<gridSize; i++)

for (int j=0;j< *gridColSize; j++)

{

if (grid[i][j]==0)

continue;

if (grid[i][j]==1)

perimeter+=4;

if (i>0 && grid[i-1][j]==1)

{

perimeter-=2;

}

if (j>0 && grid[i][j-1]==1)

perimeter-=2;

}

return perimeter;

}

修一修可以寫到這麼短這樣。

int islandPerimeter(int** grid, int gridSize, int* gridColSize){
    int perimeter=0;
    for (int i=0;i<gridSize; i++)
        for (int j=0;j< *gridColSize; j++)
            if (grid[i][j]==1)
            {
                perimeter+=4;
                if (i>0 && grid[i-1][j]==1)
                    perimeter-=2;
                if (j>0 && grid[i][j-1]==1)
                    perimeter-=2;
            }
    return perimeter;
}