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题目：
题解：
int mySqrt(int x) {long int i = 0;for(i=0;;i++){long int a = i*i;long int b = (i+1)*(i+1);if(a <= x&&b > x){break;}}return i;
}
题目：
题解：
int mySqrt(int x) {long int i = 0;for(i=0;;i++){long int a = i*i;long int b = (i+1)*(i+1);if(a <= x&&b > x){break;}}return i;
}