Help needed in HXOR, unable to clear test case 4

Tried the implementation as per editorial, still getting WA for test case 4. Not sure what I’m doing wrong.

Code link: https://www.codechef.com/viewsolution/40451631

Your code is failing following test case type :-
1
4 4
2 5 5 9

your code (O/P) :- 0 0 2 9
Correct O/P :- 0 0 0 11

you first loop is running till ( i < n-1 ) change it to ( i < n )

while( 1 )
    {
        if( x == 0 )
            break;
        while( i < n  && a[ i ] == 0 )          // here change to ( i < n ) from ( i < n-1)
            i++;
        if( i == n - 1 )
            break;
        ```

Still facing the same issue.

Code link: https://www.codechef.com/viewsolution/40452149

yep I forgot to add this

if(( x % 2 && n == 2 ))    // in this conditon if we have any odd value of x and n==2 we need to apply xor on last two
    {
        a[ n - 1 ] ^= 1;
        a[ n - 2 ] ^= 1;
    }

It will work fine after those changes see here :- https://www.codechef.com/viewsolution/40452039

That worked, thanks for the help.

welcome