492. Valid Perfect Square
EasyBinary Search
Print YES if n is a perfect square, else NO, without using a square-root function.
Input format
One integer n
Output format
YES or NO
Example 1
Input
16
Output
YES
Example 2
Input
14
Output
NO
Constraints
1 ≤ n ≤ 2³¹ − 1
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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