Untitled

this part can we rite as solve(idx,diff)
{
    int a = INT_MIN;   
    // take
    if(idx+1<arr.length && nums[idx+1] - nums[idx] == diff)
{
 a  = 1 + solve(idx+1,diff);    
}
a = MAX(a,solve(idx,diff))
return a; 

}
ChatGPT said:
Your idea is close, but there are some issues in the logic that need to be fixed:

Incorrect recursive call in a = MAX(a, solve(idx, diff))

You are calling solve(idx, diff) instead of solve(idx + 1, diff), which means you're not moving forward.
This would cause an infinite recursion (or incorrect results).