{leetcode}/problems/sqrtx/[LeetCode - Sqrt(x)^]
明知使用的是二分查找，竟然没有写出来！！
Implement int sqrt(int x).
Compute and return the square root of x, where x is guaranteed to be a non-negative integer.
Since the return type is an integer, the decimal digits are truncated and only the integer part of the result is returned.
Example 1:
Input: 4 Output: 2
Example 2:
Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since
the decimal part is truncated, 2 is returned.
link:{sourcedir}/_0069_SqrtX.java[role=include]