Submission #498349

#	Time	Username	Problem	Language	Result	Execution time	Memory
498349		kingline	Sure Bet (CEOI17_sure)	C++17	100 / 100	121 ms	2656 KiB

sure

/*#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")*/
#include <bits/stdc++.h>
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
//#define file(data) freopen(data".in", "r", stdin); freopen(data".out", "w", stdout);
#define pb push_back
//#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(data) data.begin() , data.end()
#define endl '\n'
//freopen("nenokku_easy.in", "r", stdin);
//freopen("nenokku_easy.out", "w", stdout);
#define int long long
#define pii pair < int, int >
#define pll pair < long long, long long >

using namespace std;

typedef long long ll;
const int N = 2e5 + 5;
const int M = 305;
const int mod = 1e9 + 7;

int n;
double a[N], b[N], pref[N];

main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //file("pieaters");
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i];
    }
    sort(a + 1, a + n + 1);
    reverse(a + 1, a + n + 1);
    sort(b + 1, b + n + 1);
    reverse(b + 1, b + n + 1);
    for(int i = 1; i <= n; i++) {
        pref[i] = pref[i - 1] + b[i];
    }
    double ans = 0, suma = 0;
    for(int i = 1; i <= n; i++) {
        suma += a[i];
        int l = 1, r = n;
        while(r - l > 2) {
            int md1 = l + (r - l) / 3, md2 = r - (r - l) / 3;
            if(min(suma, pref[md1]) - i - md1 >= min(suma, pref[md2]) - i - md2) {
                r = md2;
            } else {
                l = md1;
            }
        }
        ans = max(ans, min(suma - i - r, pref[r] - i - r));
        ans = max(ans, min(suma - i - l, pref[l] - i - l));
        l++;
        ans = max(ans, min(suma - i - l, pref[l] - i - l));
        /*
        for(int j = 1; j <= n; j++) {
            ans = max(ans, min(suma, pref[j]) - i - j);
        }*/
    }
    cout << fixed << setprecision(4) << ans;
}

Compilation message (stderr)

sure.cpp:30:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   30 | main() {
      | ^~~~

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