每日一题洛谷P1025 [NOIP 2001 提高组] 数的划分c++

P1025 [NOIP 2001 提高组] 数的划分 - 洛谷 (luogu.com.cn)

#include<iostream>
using namespace std;
int n, k;
int res = 0;
void dfs(int num,int step,int sum) {
	//判断
	if (sum == n) {
		if (step == k) {
			res++;
			return;
		}
	}
	if (sum > n || step == k)return;
	//搜索
	for (int i = num; i * (k - step) + sum <= n; i++) {
		dfs(i, step + 1, sum + i);
	}
}
int main() {
	cin >> n >> k;
	dfs(1, 0, 0);
	cout << res;
	return 0;
}