Leetcode Guess Number Higher or Lower problem solution

YASH PAL,

In this Leetcode Guess Number Higher or Lower problem solution, We are playing the Guess Game. The game is as follows:

I pick a number from 1 to n. You have to guess which number I picked.

Every time you guess wrong, I will tell you whether the number I picked is higher or lower than your guess.

You call a pre-defined API int guess(int num), which returns 3 possible results:

  1. -1: The number I picked is lower than your guess (i.e. pick < num).
  2. 1: The number I picked is higher than your guess (i.e. pick > num).
  3. 0: The number I picked is equal to your guess (i.e. pick == num).

Return the number that I picked.

Leetcode Guess Number Higher or Lower problem solution

Problem solution in Python.

class Solution(object):
    def guessNumber(self, n):
        """
        :type n: int
        :rtype: int
        """
        left,right = 1,n
        while left<=right:
            mid = (left+right)/2
            gues = guess(mid)
            if gues == 0:
                return mid
            if gues == -1:
                right = mid -1
            if gues == 1:
                left = mid+1
        return -1

Problem solution in Java.

public class Solution extends GuessGame {
    public int guessNumber(int n) {
        int left = 1;
        int right = n;
        while(left < right){
            int myPick = left + (right - left )/ 2;
            if(guess(myPick) == 0) return myPick;
            else if(guess(myPick) == 1){
                left = myPick + 1;
            }
            else{
                right = myPick - 1;
            }
        }
        return left;
    }
}

Problem solution in C++.

int guess(int num);

class Solution {
public:
    int guessNumber(int n) {
        if (guess(n) == 0)
            return n;
        int i = 1;
        int j = n;
        while (i < j) {
            int mid = i + (j - i) / 2;
            int tmp = guess(mid);
            if (tmp == 0)
                return mid;
            else if (tmp == 1)
                i = mid + 1;
            else
                j = mid - 1;
        }
        return i;
    }
};

Problem solution in C.

int guessNumber(int n){
    int l = 1, h = n;
    
    while(l <= h){
        int mid = l + (h-l)/2;
        
        if(guess(mid) == 0) return mid;
        else if(guess(mid) == 1){
            l = mid+1;
            mid = l + (h-l)/2;
        }
        else{
            h = mid-1;
            mid = l + (h-l)/2;
        }
    }
    return -1;
}

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