제출 #759223

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
759223		sofija6	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	224 ms	20896 KiB

bobek

#include <bits/stdc++.h>
#define ll long long
#define MAXN 50
using namespace std;
ll a[MAXN],m;
vector<ll> v1,v2;
void Solve(ll l,ll r,ll cur,ll pos,vector<ll> &v)
{
    if (pos>r)
    {
        v.push_back(cur);
        return;
    }
    Solve(l,r,cur,pos+1,v);
    Solve(l,r,cur+a[pos],pos+1,v);
}
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n,ans=0;
    cin >> n >> m;
    for (ll i=1;i<=n;i++)
        cin >> a[i];
    Solve(1,n/2,0,1,v1);
    Solve(n/2+1,n,0,n/2+1,v2);
    sort(v1.begin(),v1.end());
    sort(v2.begin(),v2.end());
    for (auto i : v1)
    {
        auto it=upper_bound(v2.begin(),v2.end(),m-i);
        if (it==v2.begin())
                continue;
        it--;
        ans+=it-v2.begin()+1;
    }
    cout << ans;
    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