#include<bits/stdc++.h>
#pragma GCC optimize("Ofast,O3,unroll-loops")
#define double long double
#define ll long long
#define fi first
#define se second
#define ii pair<ll,ll>
#define pb push_back
using namespace std;
const ll N=2e5+5;
const long long mod=1e9+7;
const double esp=1e-8;
double a[N],b[N];
ll vta,vtb,i,j,n;
bool kt(double k)
{
for(ll i=1;i<=n;i++)
if(a[i]>=k)
{
ll l=1,r=n,vt;
double tmp=i;
if(b[n]-tmp<k) continue;
while(l<=r)
{
ll mid=(l+r)/2;
if(b[mid]-tmp>=k)
{
vt=mid;
r=mid-1;
}
else l=mid+1;
}
tmp=vt;
if(a[i]-tmp>=k) return 1;
}
return 0;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
cin>>n;
for(i=1;i<=n;i++){
cin>>a[i]>>b[i];
}
sort(a+1,a+n+1,greater<double>());
sort(b+1,b+n+1,greater<double>());
a[1]-=1;
b[1]-=1;
for(i=2;i<=n;i++)
{
a[i]+=a[i-1]-1;
b[i]+=b[i-1]-1;
}
//return cout<<kt(0.5),0;
ll l=0,r=1e12;
double kq;
while(l<=r)
{
ll mid=(l+r)/2;
double tmp=mid;
tmp/=10000;
if(kt(tmp))
{
kq=tmp;
l=mid+1;
}
else r=mid-1;
}
cout<<setprecision(4)<<fixed<<kq;
}
/*
5
1.5 2.5
2.5 1.8
1.8 2.2
1.6 2.1
2.5 1.4
*/
Compilation message
sure.cpp: In function 'bool kt(long double)':
sure.cpp:33:8: warning: 'vt' may be used uninitialized in this function [-Wmaybe-uninitialized]
33 | tmp=vt;
| ~~~^~~
sure.cpp: In function 'int main()':
sure.cpp:33:8: warning: 'vt' may be used uninitialized in this function [-Wmaybe-uninitialized]
33 | tmp=vt;
| ~~~^~~
sure.cpp:20:16: note: 'vt' was declared here
20 | ll l=1,r=n,vt;
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
2396 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
2396 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
2396 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
