Submission #883276

#	Time	Username	Problem	Language	Result	Execution time	Memory
883276		votranngocvy	Sure Bet (CEOI17_sure)	C++14	0 / 100	3 ms	1368 KiB

sure

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

const int N = 1e5 + 5;
double a[N],b[N],sumA[N],sumB[N];

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    freopen("task.inp","r",stdin);
    freopen("task.out","w",stdout);
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i] >> b[i];
    sort(a + 1,a + n + 1,greater<double>());
    sort(b + 1,b + n + 1,greater<double>());
    sumA[0] = 0,sumB[0] = 0;
    for (int i = 1; i <= n; i++) {
        sumA[i] = sumA[i - 1] + a[i];
        sumB[i] = sumB[i - 1] + b[i];
    }
    int j = 1;
    double ans = 0;
    for (int i = 1; i <= n; i++) {
        while (j <= n && sumA[i] + sumB[j] - i - j <= sumA[i] + sumB[j - 1] - i - j - 1) j++;
        ans = max(ans,min(sumA[i],sumB[j]) - i - j);
    }
    cout << fixed << setprecision(4) << ans << "\n";
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:10:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     freopen("task.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sure.cpp:11:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     freopen("task.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40