제출 #208154

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
208154		smhh22	Ice Hockey World Championship (CEOI15_bobek)	C++11	100 / 100	414 ms	16848 KiB

bobek

//besmellah
#include <bits/stdc++.h>
using namespace std;

#define int long long
int sum[1 << 20], a[40];
vector <int> V;

int32_t main() {
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++)
		cin >> a[i];
	V.push_back(0);
	for (int mask = 1; mask < (1 << (n / 2)); mask++) {
		sum[mask] = sum[mask - (mask & -mask)] + a[__builtin_ctz(mask)];
		V.push_back(sum[mask]);
	}
	sort(V.begin(), V.end());
	int ans = 0;
	ans += upper_bound(V.begin(), V.end(), m) - V.begin();
	for (int mask = 1; mask < (1 << ((n + 1) / 2)); mask++) {
		sum[mask] = sum[mask - (mask & -mask)] + a[n / 2 + __builtin_ctz(mask)];
		ans += upper_bound(V.begin(), V.end(), m - sum[mask]) - V.begin();
	}
	cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10