제출 #1295626

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1295626		hasan	Ice Hockey World Championship (CEOI15_bobek)	C++20	0 / 100	546 ms	16884 KiB

bobek

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

#define endl '\n'
#define int int_fast64_t
#define ul uint_fast32_t
#define ll int_fast64_t
#define dll long double
#define ull uint_fast64_t
#define spektar this_thread::sleep_for(chrono::milliseconds(1000))

void solve(){
    ll n,m;
    cin >> n >> m;
    vector<ll> k(n);
    for(int i=0; i<n; i++) cin >> k[i];
    vector<ll> kk;
    ll ss=0;
    kk.push_back(0);
    for(ll i=0; i<(1<<(n/2)); i++){
        ll s=0;
        for(int j=0; j<n/2; j++){
            if((1<<j)&i){
                s+=k[j];
            }
        }
        if(s<=m){
            kk.push_back(s);
        }
    }
    sort(kk.begin(),kk.end());
    for(ll i=0; i<(1<<(n-n/2)); i++){
        ll s=0;
        for(int j=n/2; j<n; j++){
            if((1<<(j-n/2))&i){
                s+=k[j];
            }
        }
        ll a;
        if(lower_bound(kk.begin(),kk.end(),m-s)==kk.end()) a=kk.size();
        else if(lower_bound(kk.begin(),kk.end(),m-s)==kk.begin()) a=0;
        else a=lower_bound(kk.begin(),kk.end(),m-s)-kk.begin();
        ss+=a;
    }
    cout << ss-1 << endl;
}

signed main(){
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int t=1;
    //cin >> t;
    while(t--){
        solve();
    }
}

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