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C++
1 class Solution { 2 public: 3 /** 4 * @param x: An integer 5 * @return: The sqrt of x 6 */ 7 int sqrt(int x) { 8 // write your code here 9 if (x<=1) {10 return x;11 }12 int left = 1;13 int right = x;14 while (left <= right) {15 int mid = left + ((right - left) >> 1);16 if (mid == x/mid) {17 return mid;18 }19 else if (mid < x/mid) {20 left = mid + 1;21 } else {22 right = mid - 1;23 }24 }25 return right;26 }27 };
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