What is mistake in my solution

[rbpagire (Shubham Pagire)]

Problem link: https://leetcode.com/explore/challenge/card/30-day-leetcoding-challenge/531/week-4/3313/

solution: https://ide.codingblocks.com/s/288781

[aman212yadav (Aman Yadav)]

hello @rbpagire

i m getting this

on clicking that link.
pls mention problem name or any other working link

[rbpagire (Shubham Pagire)]

@aman212yadav Problem:First Unique Number
from 30 day leetcoding challenge (april : week 4 , last problem)