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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.
                
      
代码：
                
      
                    
       
class Solution {public:    int mySqrt(int x) {        int ans = (int)sqrt(x);        return ans;    }}
                
      
            
     
        
    
    
   

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