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SqrtX.java
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SqrtX.java
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public class Solution {
public int mySqrt(int x) {
if (x == 0) {
return 0;
}
if (x == 1 || x == 2 || x == 3) {
return 1;
}
long low = 2;
long high = x / 2 + 1;
while (low < high) {
long mid = low + (high - low) / 2;
long curr = mid * mid;
if (curr == x) {
return (int) mid;
} else if (curr > x) {
if (mid - 1 < 2 || (mid - 1) * (mid - 1) < x) {
return (int) mid - 1;
} else {
high = mid - 1;
}
} else {
if (mid + 1 > (x/2 + 1) || (mid + 1) * (mid + 1) > x) {
return (int) mid;
} else {
low = mid + 1;
}
}
}
return (int) low;
}
}