Submission #1027367

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027367		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	50 ms	8284 KiB

sure

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
// #define double long double
 
#define endl '\n'
#define fastIO ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define setmin(x, y) x = min((x), (y))
#define setmax(x, y) x = max((x), (y))
#define sqr(x) ((x) * (x))
#define fi first
#define se second
 
// mt19937 hdp(chrono::high_resolution_clock::now().time_since_epoch().count());
// int rand(int l, int r){return l + ((hdp() % (r - l + 1)) + r - l + 1) % (r - l + 1);}
 
const int NM = 1e6 + 5;
const int mod = 1e6 + 3;
const int inf = 1e9 + 1;

int n;
double a[NM], b[NM], ans, cur, A, B;

signed main()
{
    if (fopen("in.txt", "r")) {
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    }
    fastIO
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i] >> b[i];
    sort(a + 1, a + 1 + n, greater<double>());
    sort(b + 1, b + 1 + n, greater<double>());
    int pa = 0, pb = 0;
    while (pa < n || pb < n)
    {
        if (pa == n)
        {
            ++pb;
            B += b[pb];
        }
        else if (pb == n)
        {
            ++pa;
            A += a[pa];
        }
        else if (A <= B)
        {
            ++pa;
            A += a[pa];
        }
        else
        {
            ++pb;
            B += b[pb];
        }
        setmax(ans, min(A, B) - pa - pb);
    }
    cout << fixed << setprecision(4) << ans;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen("in.txt","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
sure.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen("out.txt","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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