#include <bits/stdc++.h>
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define fast ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
#define all(v) v.begin(),v.end()
#define pb push_back
#define sz size()
#define ft first
#define sd second
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef unsigned long long ull;
const int N = 1e6 + 5;
const ll M = 1e8;
const ll inf = 1e18;
const ll mod = 1e9;
const double Pi = acos(-1);
ll binpow(ll x, ll ti) { ll res = 1;while (ti){if(ti & 1)res *= x;x *= x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll binmul(ll x, ll ti) { ll res = 0;while (ti){if(ti & 1)res += x;x += x;ti >>= 1; x %= mod; res %= mod;} return res;}
ll nok(ll a, ll b) { return (a*b)/__gcd(abs(a),abs(b)) * (a*b > 0 ? 1 : -1); }
bool odd(ll n) { return (n % 2 == 1); }
bool even(ll n) { return (n % 2 == 0); }
ll n;
double a[N], b[N];
const void solve(/*Armashka*/) {
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);
double ans = 0.0, sum1 = 0.0, sum2 = 0.0;
ll l1 = 1, l2 = 1;
while (l1 <= n && l2 <= n) {
if (l1 > n) {
sum2 += b[l2];
double cnt = l1 + l2 - 1;
ans = max(ans, min(sum1 - cnt, sum2 - cnt));
++ l2;
} else if (l2 > n) {
sum1 += a[l1];
double cnt = l1 + l2 - 1;
ans = max(ans, min(sum1 - cnt, sum2 - cnt));
++ l1;
} else {
if (fabs(sum1 + a[l1] - sum2) < fabs(sum2 + b[l2] - sum1)) {
sum1 += a[l1];
double cnt = l1 + l2 - 1;
ans = max(ans, min(sum1 - cnt, sum2 - cnt));
++ l1;
} else {
sum2 += b[l2];
double cnt = l1 + l2 - 1;
ans = max(ans, min(sum1 - cnt, sum2 - cnt));
++ l2;
}
}
//cout << sum1 << " " << sum2 << " " << l1 + l2 - 1 << "\n";
}
cout << fixed << setprecision(4) << ans << "\n";
}
signed main() {
fast;
//freopen("divide.in", "r", stdin);
//freopen("divide.out", "w", stdout);
int tt = 1;
//cin >> tt;
while (tt --) {
solve();
}
}
/*
5 4 4
1 2
3 1
3 4
5 3
4 5 2 3
2 1 3 1
1 3 5
2 3 4 5
2 1 3 1
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
