CF1252H.Twin Buildings

普及/提高-

通过率：0%

AC君温馨提醒

该题目为【codeforces】题库的题目，您提交的代码将被提交至codeforces进行远程评测，并由ACGO抓取测评结果后进行展示。由于远程测评的测评机由其他平台提供，我们无法保证该服务的稳定性，若提交后无反应，请等待一段时间后再进行重试。

题目描述

Input begins with a line containing an integer: $N$ ( $1 \le N \le 100\,000$ ) representing the number of available lands. The next $N$ lines each contains two integers: $L_i$ $W_i$ ( $1 \le L_i, W_i \le 10^9$ ) representing the size of the land.

输入格式

Output in a line a number representing the largest building that ICPC Jakarta can build with exactly one decimal point (see sample input/output for clarity).

输出格式

Explanation for the sample input/output #1

Two buildings of $2.5 \times 5$ can be built both on the first land.

Explanation for the sample input/output #2

Two buildings of $2 \times 4$ can be built each on the first and second lands.

Explanation for the sample input/output #3

Two buildings of $7 \times 6$ can be built each on the second and third lands.

输入输出样例

输入#1
```
2
5 5
3 4
```
输出#1
```
12.5
```
输入#2
```
2
2 5
4 3
```
输出#2
```
8.0
```
输入#3
```
3
10 1
9 8
7 6
```
输出#3
```
42.0
```