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package leetcode._69_;

class Solution {

public int mySqrt(int x) {

int left = 0; // 二分法

int right = x;

int medium = (left + right) / 2;

while (left <= right) {

if (medium == 0) {

return right;

}

int target = x / medium;

if (medium == target || medium == target + 1) {

return target;

} else if (target < medium) {

right = medium;

} else if (target > medium - 1) {

left = medium + 1;

}

medium = (left + right) / 2;

}

return 0;

}

}