Submission #1260506

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260506		wedonttalkanymore	Hindeks (COCI17_hindeks)	C++20	50 / 50	29 ms	4164 KiB

hindeks

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 5e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 16;

int n;
int a[N];

bool check(int mid) {
    int sum = 0;
    for (int i = 1; i <= n; i++) {
        sum += (a[i] >= mid);
    }
    return sum >= mid;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    int l = 1, r = 1e6, ans = 0;
    while(l <= r) {
        int mid = (l + r) / 2;
        if (check(mid)) {
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

hindeks.cpp: In function 'int main()':
hindeks.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
hindeks.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 50 / 50