FilesExpand file tree

 master

/

SquareRootX.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

63 lines (47 loc) · 1.11 KB

 master

/

SquareRootX.java

Copy path

Top

File metadata and controls

• Code
• Blame

63 lines (47 loc) · 1.11 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

package Leetcode.Youtube;

public class SquareRootX {

public static int mySqrt(int x) {

for (int i = 0; i <= x; i++) {

if (i * i == x)

return i;

if (i * i > x) {

return i - 1;

}

}

return -1;

}

// optimal approach using binary search

public static int mySqrt2(int x) {

if (x < 2)

return x;

long low = 1, high = x / 2;

long ans = 0;

while (low <= high) {

long mid = low + (high - low) / 2;

if (mid * mid <= x) {

ans = mid;

low = mid + 1;

} else {

high = mid - 1;

}

}

return (int)ans;

}

public static void main(String[] args) {

System.out.println(mySqrt(4));

System.out.println(mySqrt(8));

System.out.println(mySqrt(2));

System.out.println(mySqrt(67));

System.out.println(mySqrt(86));

System.out.println(mySqrt(40));

System.out.println(mySqrt(999999999));

System.out.println();

System.out.println(mySqrt2(4));

System.out.println(mySqrt2(8));

System.out.println(mySqrt2(2));

System.out.println(mySqrt2(67));

System.out.println(mySqrt2(86));

System.out.println(mySqrt2(40));

System.out.println(mySqrt2(999999999));

}

}