제출 #759221

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
759221		sofija6	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	220 ms	20852 KiB

bobek

#include <bits/stdc++.h>
#define ll long long
#define MAXN 50
using namespace std;
ll a[MAXN],m,l,r;
vector<ll> v1,v2;
void Solve_1(ll cur,ll pos)
{
    if (pos>r)
    {
        if (cur>m)
            return;
        v1.push_back(cur);
        return;
    }
    Solve_1(cur,pos+1);
    Solve_1(cur+a[pos],pos+1);
}
void Solve_2(ll cur,ll pos)
{
    if (pos>r)
    {
        if (cur>m)
            return;
        v2.push_back(cur);
        return;
    }
    Solve_2(cur,pos+1);
    Solve_2(cur+a[pos],pos+1);
}
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];
    l=1;
    r=n/2;
    Solve_1(0,1);
    l=n/2+1;
    r=n;
    Solve_2(0,n/2+1);
    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