제출 #1110644

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1110644		basa	Ice Hockey World Championship (CEOI15_bobek)	C++14	0 / 100	27 ms	18880 KiB

bobek

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define mod 1000000007

const int maxn = 45;
int a[maxn];

int n, m;
int ans = 0;
vector<int>v;

void s1(int i, int sum){
  if(i == (n / 2) + 1){
    v.push_back(sum);
    return;
  }

  s1(i + 1, sum);
  s1(i + 1, sum + a[i]);
}

void s2(int i, int sum){
  if(i == n){
    auto it = upper_bound(v.begin(), v.end(), m - sum) - v.begin();
    ans += it - 1;
    return;
  }

  s2(i + 1, sum);
  s2(i + 1, sum + a[i]);
}

signed main(){
  cin.tie(0) -> sync_with_stdio(0);
  cin >> n >> m;

  for(int i = 0; i < n; i++) cin >> a[i];

  s1(0, 0);
  s2((n / 2) + 1, 0);

  cout << ans;
}

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