답안 #445910

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
445910	2021-07-20T07:27:22 Z	snasibov05	Ice Hockey World Championship (CEOI15_bobek)	C++14	컴파일 오류	0 ms	0 KB

bobek

#include <iostream>
#include <vector>

using namespace std;

#define ll long long
#define pb push_back

int main() {
    int n; ll m; cin >> n >> m;
    vector<ll> v(n);
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }

    int mid = (n-1) / 2;
    vector<ll> p1;

    p1.pb(0);
    for (int i = 0; i < (1 << (mid+1)); ++i) {
        ll sum = 0;
        int x = i;
        for (int j = 0; j <= mid; ++j) {
            if (x % 2 == 1) sum += v[j];
            x /= 2;
        }
        if (sum <= m) p1.pb(sum);
    }

    sort(p1.begin(), p1.end());

    ll ans = p1.size();
    for (int i = 0; i < (1 << (n - mid - 1)); ++i) {
        ll sum = 0;
        int x = i;
        for (int j = mid + 1; j < n; ++j) {
            if (x % 2 == 1) sum += v[j];
            x /= 2;
        }
        if (sum > m) continue;
        int k = upper_bound(p1.begin(), p1.end(), m - sum) - p1.begin();
        ans += 1ll * k;
    }

    ans /= 2;

    cout << ans << "\n";


    return 0;
}

Compilation message

bobek.cpp: In function 'int main()':
bobek.cpp:30:5: error: 'sort' was not declared in this scope; did you mean 'qsort'?
   30 |     sort(p1.begin(), p1.end());
      |     ^~~~
      |     qsort
bobek.cpp:41:17: error: 'upper_bound' was not declared in this scope
   41 |         int k = upper_bound(p1.begin(), p1.end(), m - sum) - p1.begin();
      |                 ^~~~~~~~~~~