Submission #1121492

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121492		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	407 ms	8804 KiB

bobek

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
 
#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pii>
#define db long double
#define vll vector<pll>
#define endl '\n'
#define all(x) x.begin(), x.end()
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
#define int long long

int n, m, res, a[45];

void fmain(){
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    vi v;
    for(int mask = 0; mask < (1 << (n / 2)); mask++){
        int s = 0;
        for(int i = 0; i < n / 2; i++){
            if((1 << i) & mask){
                s += a[i + 1];
            }
        }
        v.push_back(s);
    }
    sort(all(v));
    for(int mask = 0; mask < (1 << (n - n / 2)); mask++){
        int s = 0;
        for(int i = 0; i < n - n / 2; i++){
            if((1 << i) & mask){
                s += a[n / 2 + i + 1];
            }
        }
        int ind = upper_bound(all(v), m - s) - v.begin();
        res += ind;
    }
    cout << res;
}
 
signed main(){
    fastio;
    int tmr = 1;
    // cin >> tmr;
    while(tmr--){
        fmain();
    }
    
}

• 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