Submission #1295616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1295616		ulvix	Ice Hockey World Championship (CEOI15_bobek)	C++20	100 / 100	311 ms	21428 KiB

bobek

#include <bits/stdc++.h>
#ifdef ULVI
    #define db(x)          cerr<<"[ "<<#x<<" = "<<(x)<<" ]\n"
    #define dbv(v)         cerr<<#v<<" = [ ";for(auto &__x : v)cerr<<__x<<' ';cerr<<"]\n"
    #define line()         cerr<<string(80, '-')<<'\n'
#else
    #define db(x)
    #define dbv(v)
    #define line()
#endif
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ff first
#define ss second
#define enld endl
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<ll,ll> pll;
const ll sz=2e5+100;
const ll mod=1e9+7;
const ll inf=1e18;
template<class T>
using indexed_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
vector<ll> f(ll l,ll r,vector<ll> &v){
    if(l>r) return {0};
    ll ln=r-l+1;
    vector<ll> res;
    for(ll i=0;i<(1LL<<ln);i++){
        ll sum=0;
        for(ll j=0;j<ln;j++) if(i>>j&1) sum+=v[l+j];
        res.push_back(sum);
    }
    return res;
}
void solve(){
    ll n,m;
    cin>>n>>m;
    vector<ll> v(n);
    for(ll i=0;i<n;i++) cin>>v[i];
    vector<ll> l=f(0,n/2-1,v),r=f(n/2,n-1,v);
    sort(all(l));
    sort(all(r));
    ll ans=0;
    for(ll i:l){
        auto itl=upper_bound(all(r),m-i);
        ans+=itl-r.begin();
    }
    cout<<ans<<'\n';
}

int main(){
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    //cin>>t;
    for(ll _=1;_<=t;_++){
        //cout<<"Scenario #"<<_<<":\n";
        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