제출 #1110611

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1110611		kasdo	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	336 ms	10852 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 45;
vector<int> v;
int n, m;
int a[maxn];
int mid;
int ans = 0;
void rec(int i, int sum)
{
    if (i == mid)
    {
        v.push_back(sum);
        return;
    }
    rec(i + 1, sum); rec(i + 1, sum + a[i]);
}
void rec2(int i, int sum)
{
    if (i == mid - 1)
    {
        int idx = upper_bound(v.begin(), v.end(), m - sum) - v.begin();
        // cout<<sum<<" "<<idx<<endl;
        ans += idx;
        return;
    }
    rec2(i - 1, sum); rec2(i - 1, sum + a[i]);
}
signed main()
{
    cin>>n>>m;
    
    for(int i=0; i<n; i++) cin>>a[i];
    
    mid = (n + 1) / 2;
    rec(0, 0);
    sort(v.begin(), v.end());
    
    // for(auto i : v) cout<<i<<" ";
    // cout<<endl;
    
    rec2(n - 1, 0);
    cout<<ans<<endl;
    
    return 0;
}

• 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