Submission #560680

#	Time	Username	Problem	Language	Result	Execution time	Memory
560680		urosk	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	385 ms	20880 KiB

bobek

// __builtin_popcount(x)
// __builtin_popcountll(x)
#define here cerr<<"===========================================\n"
#include <bits/stdc++.h>
#define ld double
#define ll long long
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
using namespace std;

#define maxn 45
ll n,m;
ll a[maxn];
vector<ll> get(ll l,ll r){
    vector<ll> v;
    ll siz = r-l+1;
    for(ll mask = 0;mask<(1<<siz);mask++){
        ll sum = 0;
        for(ll i = 0;i<siz;i++) if((1<<i)&mask) sum+=a[i+l];
        v.pb(sum);
    }
    sort(all(v));
    return v;
}
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n >> m;
    for(ll i = 1;i<=n;i++) cin >> a[i];
    ll mid = (n+1)/2;
    vector<ll> ls = get(1,mid);
    vector<ll> rs = get(mid+1,n);
    ll ans = 0;
    for(ll x : ls){
        ll i = upper_bound(all(rs),m-x) - rs.begin();
        ans+=i;
    }
    cout<<ans<<endl;
	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