EDIT : My query has already been answered, thank you for the help.
EDIT : My query has already been answered, thank you for the help.
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Seems like int overflow in ans -=((x)*(x + 1))/2;
Check the following:
int x=(1<<20); ll ans=x*x; cout<<ans<<'\n';
it outputs 0 instead of $$$2^{40}$$$.
Why havn't you delete this yet.