Submission #843482

#	Time	Username	Problem	Language	Result	Execution time	Memory
843482		vjudge1	Sure Bet (CEOI17_sure)	C++17	60 / 100	2039 ms	6480 KiB

sure

 ///***LTT***///
/// ->TUYEN QUOC GIA<- ///
#include<bits/stdc++.h>
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("popcnt")
//#define int long long
#define endl "\n"
#define F first
#define S second
#define pb push_back
#define CHECKBIT(mask,i) ((mask>>(i) )&1) // == 1 la bat, == 0 la tat
#define OFFBIT(mask,i) ((1<<(i))^mask) // tat bit thu i
#define ONBIT(mask,i) ((1<<(i))mask) // bat bit thu i
using namespace std;
const long long oo = 1e9+7;
const int N = 2 * 1e5 + 10;
int n;
long double  a[N], b[N], L, R, cntl, cntr, ans;
bool cmp (long double a,long double b){
    return a > b;
}
void inp(){
    cin >> n;
    for (int i = 1;i <= n;i++){
        cin >> a[i] >> b[i];
    }
    return;
}
void solve(){
    sort(a+1,a+n+1,cmp);
    sort(b+1,b+n+1,cmp);
//    for (int i = 1;i <= n;i++){
//        cout << a[i] <<" "<< b[i] <<"\n";
//    }
    for (int i = 1;i <= n;i++){
        cntl++;
        cntr = 0;
        L += a[i];
        R = 0;
        for (int j = 1;j <= n;j++){
            cntr++;
            R += b[j];
            ans = max(ans, min(R - (cntl + cntr), L - (cntl + cntr) ));
        }
    }
    cout << fixed << setprecision(4) << ans;
    return;
}
int main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);
    if (fopen("file.inp", "r")){
        freopen("file.inp", "r", stdin);
        freopen("file.out", "w", stdout);
    }
    //int t;
    //cin >> t;
    //while(t--){
    inp();
    solve();
    //}
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen("file.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen("file.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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