제출 #1121582

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1121582		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	361 ms	20888 KiB

bobek

#include<bits/stdc++.h>

#define ll long long
#define pb push_back
#define in insert
#define fi first
#define se second
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define endl "\n"

using namespace std;
const int sz = 1e6 + 5; /// mind this
const int MAX = 2e6 + 123;
const int BS = 61;
const int mod = 998244353;
void solve(){
    ll n, k, i, j, ans = 0;
    cin >> n >> k;
    vl v(n);
    for(i = 0; i < n; i++){
        cin >> v[i];
    }
    ll m = n / 2;
    vl S1, S2;
    for(i = 0; i < (1 << m); i++){
        ll s = 0;
        for(j = 0; j < m; j++){
            if(i & (1 << j)){
                s += v[j];
            }
        }
        S1.pb(s);
    }
    for(i = 0; i < (1 << (n - m)); i++){
        ll s = 0;
        // cout << i << ": ";
        for(j = 0; j < (n - m); j++){
            if(i & (1 << j)){
                // cout << j << ' ';
                s += v[j + m];
            }
        }
        // cout << "       " << s << endl;
        S2.pb(s);
    }
    sort(all(S1));
    sort(all(S2));
    // for(auto x: S2){cout << x <<  ' ';}cout << endl;
    for(auto x: S1){
        if(x > k){break;}
        ll ix = upper_bound(all(S2), k - x) - S2.begin();
        // cout << x << ' ' << ix << endl;
        ans += ix;
    }
    cout << ans << endl;


}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    ll t = 1;
    // cin >> t;
    while(t--){
        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