제출 #386858

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
386858		FatihSolak	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	550 ms	8800 KiB

bobek

#include <bits/stdc++.h>
#define N 45
using namespace std;
long long arr[N];
vector<long long> v;
void solve(){
    long long n,m;
    cin >> n >> m;
    for(int i=0;i<n;i++)cin >> arr[i];
    long long ans = 0;
    for(int i=0;i<(1<<(n/2));i++){
        long long sum = 0;
        for(int j=0;j<(n/2);j++){
            if(i & ( 1<<j)){
                sum += arr[j];
            }
        }
        v.push_back(sum);
    }
    sort(v.begin(),v.end());
    int c = n/2;
    n -= n/2;
    for(int i=0;i<(1<<n);i++){
        long long sum = 0;
        for(int j=0;j<n;j++){
            if(i & ( 1<<j)){
                sum += arr[c+j];
            }
        }
        if(sum <=m){
            ans += upper_bound(v.begin(),v.end(),m-sum) -v.begin();
        }
    }
    cout << ans;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #ifdef Local
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
    #endif
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    #ifdef Local
    cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
    #endif
}

• 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