Polygon

题号：NC219803
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 512 M，其他语言1024 M
64bit IO Format: %lld

题目描述

Given the length of $n_{}$ edges, determine whether these edges can be used to form an $n_{}$ -polygon which has positive area.

Examples of 3-polygon, 4-polygon and 6-polygon.

The first line contains a single integer  , the number of edges. 
The next line contains  integers  , the length of  edges.

If the  edges can form a  -polygon, output “Yes”, otherwise output “No”.(without quote)

示例1

复制

3
1 2 3

复制

No

示例2

复制

5
5 5 5 5 5

复制

Yes