第74题 Sqrt(x)

Implement int sqrt(int x).

Compute and return the square root of x.

Hide Tags

  Math Binary Search

Code in C++:

class Solution {
public:
    int mySqrt(int x) {
        double error = 0.00001f;
        double low=0, high = x;
        while(high-low>error){
            double mid = (low+high)/2;
            if(mid*mid<x)
                low = mid;
            else 
                high = mid;
        }
        return (int)high;
    }
};