One test case giving wrong answer

#1

My code is failing in one test case. Which constraint is missing in the code?

#2

@sourav1999
You have to do

ans+=(1LL*fre[i]*(fre[i]-1))/2;

Since fre[] was int, fre[i]*(fre[i]-1) overflows the value of int.
1LL typecastes it into long long
I hope this solves your doubt,
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