Submission #844597

#	Time	Username	Problem	Language	Result	Execution time	Memory
844597		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	92 ms	6892 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;
long double a[N], b[N], ans, L, R;
int n;
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);
    int l = 1, r = 1;
    while (l <= n or r <= n){
        if ( (L < R and l <= n) or (r == n + 1) ){
            L += a[l++];
        } else R += b[r++];
        --L;
        --R;
        ans = max(ans, min(L,R));
    }
    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:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen("file.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen("file.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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