https://blog.csdn.net/csyifanZhang/article/details/106353929
long long C[MAX][MAX], dp[MAX];//C[i][j]:在i个里面取j个
int main() {
for (int i = 1; i < MAX; i++) {
C[i][i] = C[i][0] = 1;
for (int j = 1; j < i; j++) {
C[i][j] = C[i - 1][j] + C[i - 1][j - 1];
}
}
dp[0] = 1;...