# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1121592 | vjudge1 | Ice Hockey World Championship (CEOI15_bobek) | C++14 | 433 ms | 8796 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#pragma GCC optimize ("O1")
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define pb push_back
#define F first
#define S second
#define ll long long
#define int ll
#define pii pair<int, int>
#define io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define M_PI 3.14159265358979323846
#define all(v) v.begin(), v.end()
#define pss pair<string, string>
#define no cout<<"NO"<<endl;
#define yes cout<<"YES"<<endl;
#define imp cout<<-1<<endl;
#define flu cout.flush();
#define Endl endl
const int N = 300009;
const int mod = 1e9+7;
void solve(){
int n, k;
cin>>n>>k;
vector<int>a;
for(int i=0; i<n; i++){
int x;
cin>>x;
a.pb(x);
}
int sum=0, mid1=n/2, mid2=n-mid1;
vector<int>sums;
for(int i=0; i<(1<<mid1); i++){
sum=0;
for(int j=0; j<mid1; j++){
if(i&(1<<j)){
sum+=a[j];
}
}
sums.pb(sum);
}
int ans=0;
sort(all(sums));
for(int i=0; i<(1<<mid2); i++){
int sum=0, yx=0;
for(int j=0; j<mid2; j++){
if(i&(1<<j)){
sum+=a[j+mid1];
}
}
int q=0;
q=upper_bound(all(sums), k-sum)-sums.begin();
ans+=q;
}
cout<<ans<<endl;
}
signed main(){
io;
int t=1;
//cin>>t;
while(t--){
solve();
}
}
Compilation message (stderr)
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