Submission #638816

#	Time	Username	Problem	Language	Result	Execution time	Memory
638816		HossamHero7	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	370 ms	20952 KiB

bobek

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define endl '\n'
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
void solve(){
    ll n,m;
    cin>>n>>m;
    vector<ll> v(n);
    for(auto &i:v) cin>>i;
    vector<ll> v1;
    for(int mask=0;mask<(1<<n/2);mask++){
        ll sum = 0;
        for(int i=0;i<(n>>1);i++){
            if((1<<i)&mask){
                sum += v[i];
            }
        }
        v1.push_back(sum);
    }
    sort(v1.begin(),v1.end());
    int rem = n-(n>>1);
    ll ans = 0;
    vector<ll> v2;
    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>>1)+i];
            }
        }
        v2.push_back(sum);
    }
    sort(v2.begin(),v2.end());
    for(auto i : v1){
        int upper = upper_bound(v2.begin(),v2.end(),m-i) - v2.begin();
        ans += upper;
    }
    cout<<ans<<endl;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    solve();
    return 0;
}

• 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