class Solution {
public:int mySqrt(int x) {int left=0;int right=x;int mid=left+(right-left)/2;int ans=-1;while(left<=right){mid=left+(right-left)/2;if((long long)mid*mid<=x){ans=mid;left=mid+1;}else{right=mid-1;}}return ans;}
};
*(long long)
class Solution {
public:int mySqrt(int x) {int left=0;int right=x;int mid=left+(right-left)/2;int ans=-1;while(left<=right){mid=left+(right-left)/2;if((long long)mid*mid<=x){ans=mid;left=mid+1;}else{right=mid-1;}}return ans;}
};
*(long long)
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