Submission #1005011

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005011		emad234	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	324 ms	10484 KiB

bobek

#include "bits/stdc++.h"
#define F first
#define S second
#define ll long long
#define pii pair<ll,ll>
const ll mxN = 2e5 + 5;
const ll mod = 1e9 + 7;
using namespace std;
vector<ll>v;
ll a[50];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll n,m;
    ll ans = 0;
    cin >>n>>m;
    for(ll i = 0;i < n;i++) cin >>a[i];
    ll hf = n / 2,sf = (n + 1) / 2;
    for(ll mask = 0;mask < (1 << hf);mask++){
        ll sum = 0;
        for(ll i = 0;i < hf;i++){
            if((mask >> i) % 2){
                sum += a[i];
                if(sum > m) break;
            }
        }
        if(sum > m) continue;
        v.push_back(sum);
    }
    // cout<<'\n';
    sort(v.begin(),v.end());
    // for(auto x : v) cout<<x<<' ';
    // cout<<'\n';
    for(ll mask = 0;mask < (1 << sf);mask++){
        ll sum = 0;
        for(ll i = 0;i < sf;i++){
            if((mask >> i) % 2){
                sum += a[i + hf];
                if(sum > m) break;
            }
        }
        if(sum > m) continue;
        ans += upper_bound(v.begin(),v.end(),m - sum) - v.begin();
        // cout<<sum<<' '<<upper_bound(v.begin(),v.end(),m - sum) - v.begin()<<'\n';
    }
    cout<<ans;
}

• 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