递推求组合数模板

const LL MAX = (LL)1e15 + 100;const int MAX_INDEX = 1001;LL f[MAX_INDEX][MAX_INDEX];void init(){    FF(i, 1, MAX_INDEX)    {        f[i][0] = f[i][i] = 1;        FF(j, 1, i)        {            f[i][j] = f[i - 1][j] + f[i - 1][j - 1];            if (f[i][j] > MAX) f[i][j] = MAX;        }    }}