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24 lines (23 loc) · 651 Bytes
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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;
}
}