19.2.12 [LeetCode 69] Sqrt(x)
阿新 • • 發佈:2019-02-13
分享圖片 close int 16px ted return decimal img guarantee
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.
1 class Solution { 2 public: 3 int mySqrt(int x) { 4 int s = 0, e = sqrt(INT_MAX); 5 while (s <= e) { 6 int mid = (s + e) / 2; 7 if (mid*mid <= x) 8 s = mid + 1; 9 else 10 e = mid - 1View Code; 11 } 12 return e; 13 } 14 };
19.2.12 [LeetCode 69] Sqrt(x)