Sqrt.java ( File view )

  • By issaczr 2014-10-24
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			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/sqrtx/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/20002071

// Implement int sqrt(int x).
// Compute and return the square root of x.

public class Sqrt {

	public int sqrt(int x) {

		// Note: The Solution object is instantiated only once and is reused by
		// each test case.
		if (x < 2) {

			return x;

		int low = 1;
		int high = x / 2;
		int mid = 0;
		int lastMid = 0;

		while (low <= high) {

			mid = (low + high) / 2;
			if (x / mid > mid
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