leetcode118-杨辉三角

Posted 2021-01-23 xinfenglee

/**
 * Return an array of arrays.
 * The sizes of the arrays are returned as *columnSizes array.
 * Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
 */
int** generate(int numRows, int** columnSizes) {
    
    int **array;
    array = (int **)malloc(sizeof(int *) * numRows);
    *columnSizes =(int*) malloc(sizeof(int ) * numRows);
    int i, j;
    for(i = 0; i < numRows; i++)
    {
        (*columnSizes)[i] = i+1;
        array[i] = (int*)malloc(sizeof(int) *(i+1));
        array[i][0] = 1;
        array[i][i] = 1;
    }

    for (i = 1; i < numRows; i++)
    {
         for (j = 1; j < i; j++)
         {
            array[i][j] = array[i-1][j-1] + array[i-1][j];
         }

    }
    return array; 
}

 

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