【leetcode】63. 不同路径 II

int uniquePathsWithObstacles(int** obstacleGrid, int obstacleGridSize, int* obstacleGridColSize){
    double* arr=(double*)calloc(*obstacleGridColSize,sizeof(double));
    arr[(*obstacleGridColSize)-1]=1;
    int i, r=obstacleGridSize;
    if(obstacleGrid[0][0]==1 || obstacleGrid[r-1][(*obstacleGridColSize)-1]==1)
        return 0;
    while(--r>=0){
        for(i=(*obstacleGridColSize)-1; i>=0; i--)
            arr[i]+= (obstacleGrid[r][i])?-arr[i] :(i+1<*obstacleGridColSize)?arr[i+1] :0;
    }
    return (int)*arr;
}

int uniquePathsWithObstacles(int** obstacleGrid, int obstacleGridSize, int* obstacleGridColSize){
    double* arr=(double*)calloc(*obstacleGridColSize,sizeof(double));
    arr[(*obstacleGridColSize)-1]=1;
    int i, r=obstacleGridSize;
    if(obstacleGrid[0][0]==1 || obstacleGrid[r-1][(*obstacleGridColSize)-1]==1)
        return 0;
    while(--r>=0){
        for(i=(*obstacleGridColSize)-1; i>=0; i--)
            arr[i]+= (obstacleGrid[r][i])?-arr[i] :(i+1<*obstacleGridColSize)?arr[i+1] :0;
    }
    return (int)*arr;
}