Submission #713940

#	Time	Username	Problem	Language	Result	Execution time	Memory
713940		stevancv	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	438 ms	8656 KiB

bobek

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e5 + 2;
const int M = 1e7 + 2;
const int inf = 1e9;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n;
    ll m;
    cin >> n >> m;
    vector<ll> a, b;
    for (int i = 0; i < n; i++) {
        ll x; cin >> x;
        if (i < n / 2) a.push_back(x);
        else b.push_back(x);
    }
    vector<ll> v;
    int sza = a.size();
    for (int mask = 0; mask < (1 << sza); mask++) {
        ll sum = 0;
        for (int i = 0; i < sza; i++) {
            if ((1 << i) & mask) sum += a[i];
        }
        v.push_back(sum);
    }
    sort(v.begin(), v.end());
    int szb = b.size();
    ll ans = 0;
    for (int mask = 0; mask < (1 << szb); mask++) {
        ll sum = 0;
        for (int i = 0; i < szb; i++) {
            if ((1 << i) & mask) sum += b[i];
        }
        ans += (int)(upper_bound(v.begin(), v.end(), m - sum) - v.begin());
    }
    cout << ans << en;
    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