1. Finding first non repeated character in an array
2. Linux command to list files containing specific string
3. Mysql query related to Group by

Second phone interview
1. create a doubly linked list out of that tree where each node represents sum of all nodes in the same vertical line.
2. Implement search for a sorted rotated array.

Question

1. Finding first non repeated character in an array
2. Linux command to list files containing specific string
3. Mysql query related to Group by

 Second phone interview 
1.  create a doubly linked list out of that tree where each node represents sum of all nodes in the same vertical line.
2.  Implement search for a sorted rotated array.

Kang · Accepted Answer

public class Solution {
    /** 
     *@param A : an integer rotated sorted array
     *@param target :  an integer to be searched
     *return : an integer
     */
    public int search(int[] A, int target) {
        // write your code here
        if(A == null || A.length == 0){
            return -1;
        }
        int start = 0;
        int end = A.length - 1;
        int mid;
        while(start + 1 < end){
            mid = start + (end - start) / 2;
            if(A[mid] == target){
                return mid;
            }
            if(A[start] < A[mid]){
                if(A[start] <= target && target <= A[mid]){
                    end = mid;
                }else{
                    start = mid;
                }
            }else{
                if(A[mid] <= target && target <= A[end]){
                    start = mid;
                }else{
                    end = mid;
                }
            }
        }
        if(A[start] == target){
            return start;
        }else if(A[end] == target){
            return end;
        }else{
            return -1;
        }
    }
}

Sigiloso · Answer

1. Finding first non repeated character in an array 

class FirstNonRepeatedCharacter{
    public static void main(String args[]){
        Character[] input = {'a'};
        
        if(input.length==1){
            System.out.println(input[0]);
        }
        else if(input.length>1){
        for(int i=0;i

Sigiloso · Answer

1. Finding first non repeated character in an array

class FirstNonRepeatedCharacter{
    public static void main(String args[]){
        Character[] input = {'a','b','c','b','a'};
        
        if(input.length==1){
            System.out.println(input[0]);
        }
        else if(input.length>1){
            Set unique = new LinkedHashSet();
            Set duplicates = new LinkedHashSet();
            
            for(int i=0;i

Sigiloso · Answer

Linux command to list files containing specific string 

grep -l "string" path to directory

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