public int mySqrt(int x) {
if (x == 0) {
return 0;
}
int left = 1, right = x;
int mid = 0;
while (left <= right) {
mid = left + (right - left) / 2;
if (mid <= x / mid && (mid + 1) > x / (mid + 1)) {
return mid;
}
if (mid > x / mid) {
right = mid - 1;
} else {
left = mid + 1;
}
}
return mid;
}
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