Help me in solving DNASTORAGE problem

help
,
1

My issue

string is out box please somebody help where i am wrong

My code

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc=new Scanner(System.in);
		int T=sc.nextInt();
		while(T>0){
		    int N=sc.nextInt();
		    int i=0;
		    String s=sc.nextLine();
		    while(i<N){
		    if(s.charAt(i)==0 && s.charAt(i+1)==0){
		        System.out.print("A");
		    }
		   else if(s.charAt(i)==0 && s.charAt(i+1)==1){
		        System.out.print("T");
		}
		else if(s.charAt(i)==1 && s.charAt(i+1)==0){
		        System.out.print("C");
	}
else  if(s.charAt(i)==1 && s.charAt(i+1)==1){
		        System.out.print("G");
}
i=i+2;
}
T--;}
	    
	}
    
}

Learning course: Strings using Java
Problem Link: CodeChef: Practical coding for everyone

2

import java.util.;
import java.lang.;
import java.io.*;

/* Name of the class has to be “Main” only if the class is public. */
class Codechef
{
public static void main (String args) throws java.lang.Exception
{
// your code goes here
Scanner sc = new Scanner(System.in);
int t;
t=sc.nextInt();
sc.nextLine();
while(t>0){

	    int N=sc.nextInt();
	    sc.nextLine();
	    String s=sc.nextLine();
	    
	    for (int i = 0; i < N ; i += 2) {
            int m = (s.charAt(i) - '0') * 10 + (s.charAt(i + 1) - '0');
            if (m == 0) {
                System.out.print("A");
            } else if (m == 1) {
                System.out.print("T");
            } else if (m == 10) {
                System.out.print("C");
            } else {
                System.out.print("G");
            }
            
        }
        System.out.println(); 
	    t=t-1;
	    
	}
}

}
this code will work you can compare.

3

import java.util.;
import java.lang.;
import java.io.*;

/* Name of the class has to be “Main” only if the class is public. */
class Codechef
{
public static void main (String args) throws java.lang.Exception
{
// your code goes here
Scanner sc=new Scanner(System.in);
int T=sc.nextInt();
sc.nextLine();
while(T>0){
int N=sc.nextInt();
sc.nextLine();
int i=0;
String s=sc.nextLine();
while(i<N){
if((s.charAt(i)-‘0’)==0 && (s.charAt(i+1)-‘0’)==0){
System.out.print(“A”);
}
else if((s.charAt(i)-‘0’)==0 && (s.charAt(i+1)-‘0’)==1){
System.out.print(“T”);
}
else if((s.charAt(i)-‘0’)==1 && (s.charAt(i+1)-‘0’)==0){
System.out.print(“C”);
}
else if((s.charAt(i)-‘0’)==1 && (s.charAt(i+1)-‘0’)==1){
System.out.print(“G”);
}
i=i+2;
}
System.out.println();
T–;}

}

} this is you code.