Submission #638768

#	Time	Username	Problem	Language	Result	Execution time	Memory
638768		HossamHero7	Ice Hockey World Championship (CEOI15_bobek)	C++14	60 / 100	1089 ms	74312 KiB

bobek

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
    int n;
    ll m;
    cin>>n>>m;
    vector<ll> v(n);
    for(auto &i:v) cin>>i;
    map<ll,ll> frq;
    for(int mask=0;mask<(1<<n/2);mask++){
        ll sum = 0;
        for(int i=0;i<n/2;i++){
            if((1<<i)&mask){
                sum += v[i];
            }
        }
        frq[sum] ++;
    }
    ll prev = 0;
    vector<ll> tmp;
    for(auto &i : frq){
        i.second += prev;
        tmp.push_back(i.first);
        prev = i.second;
    }
    int rem = n-n/2;
    ll ans = 0;
    for(int mask=0;mask<(1<<rem);mask++){
        ll sum = 0;
        for(int i=0;i<rem;i++){
            if((1<<i)&mask){
                sum += v[n/2+i];
            }
        }
        if(sum > m) continue;
        int upper = upper_bound(tmp.begin(),tmp.end(),m-sum) - tmp.begin();
        upper --;
        ans += frq[tmp[upper]];
    }
    cout<<ans<<endl;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10