Submission #384168

#	Time	Username	Problem	Language	Result	Execution time	Memory
384168		Sorting	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	546 ms	8796 KiB

bobek

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
template<typename T> void check_min(T &a, const T & b){ a = (a < b) ? a : b; }
template<typename T> void check_max(T &a, const T & b){ a = (a > b) ? a : b; }
const int N = 40 + 3;

int n;
ll m, a[N];
vector<ll> v;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> m;
    for(int i = 0; i < n; ++i)
        cin >> a[i];
    
    int half = n / 2;
    for(int mask = 0; mask < (1 << half); ++mask){
        ll sum = 0;
        for(int i = 0; i < half; ++i)
            if(mask & (1 << i))
                sum += a[i];
        v.push_back(sum);
    }
    sort(v.begin(), v.end());

    ll ans = 0;
    for(int mask = 0; mask < (1 << (n - half)); ++mask){
        ll sum = 0;
        for(int i = half; i < n; ++i)
            if(mask & (1 << (i - half)))
                sum += a[i];
        ans += upper_bound(v.begin(), v.end(), m - sum) - v.begin();
    }
    cout << ans << "\n";
}

• 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