Submission #53334

#	Time	Username	Problem	Language	Result	Execution time	Memory
53334		TAMREF	Ice Hockey World Championship (CEOI15_bobek)	C++11	100 / 100	587 ms	21272 KiB

bobek

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

typedef long long ll;

vector<ll> A, B;
int n;
ll m;
ll price_a[20], price_b[20];

int main(){
    cin >> n >> m;
    for(int i = 0; i < n/2; i++){
        cin >> price_a[i];
    }
    for(int i = 0; i < (n+1)/2; i++){
        cin >> price_b[i];
    }
    for(int b = 0; b < (1 << n/2); b++){
        ll subset_sum = 0;
        for(int i = 0; i < n/2; i++){
            if(b >> i & 1){
                subset_sum += price_a[i];
            }
        }
        A.push_back(subset_sum);
    }
    for(int b = 0; b < (1 << (n+1)/2); b++){
        ll subset_sum = 0;
        for(int i = 0; i < (n+1)/2; i++){
            if(b >> i & 1){
                subset_sum += price_b[i];
            }
        }
        B.push_back(subset_sum);
    }
    sort(A.begin(),A.end());

    ll ans = 0;
    for(ll &b : B){
        ans += upper_bound(A.begin(),A.end(),m-b) - A.begin();
    }
    cout << ans << '\n';
}

• 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