Submission #1122120

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122120		Almonther	Ice Hockey World Championship (CEOI15_bobek)	C++98	100 / 100	432 ms	10840 KiB

bobek

#include<bits/stdc++.h>
#define suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define co cout<< 
#define ll long long
using namespace std;
//stuff

void solve(){
    ll n,k;
    cin>>n>>k;
    ll arr[n+5];
    vector<ll>v;
    for(int i=0;i<n;i++) cin>>arr[i];
    ll n1=n/2,ans=0;
    for(int i=0;i<exp2(n1);i++){
        ll sum=0;
        ll x=i;
        for(int j=0;j<n1;j++) if(((x>>j)&1)) sum+=arr[j];
        v.push_back(sum);
    }
    sort(v.begin(),v.end());
    for(int i=0;i<exp2(n-n1);i++){
        ll sum=0;
        ll x=i;
        for(int j=0;j<n-n1;j++) if(((x>>j)&1)) sum+=arr[j+n1];
        ans+=upper_bound(v.begin(),v.end(),k-sum)-v.begin();
    }
    co ans<<'\n';
}
int main(){
    suiii
    int _=1;
    // cin>>_;
    while(_--) solve();
}

• 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