$ diff 1 2
176c176
<      v[!i%2].pb(x%2);
---
>      v[(i+1)%2].pb(x%2);
187c187
<     if(count(v[1].begin(),v[1].end(),1)!=0)
---
>     if(v[1].size()>0 && count(v[1].begin(),v[1].end(),1)!=0)
195c195
<     if(count(v[0].begin(),v[0].end(),0)!=0)
---
>     if(v[0].size()>0 && count(v[0].begin(),v[0].end(),0)!=0)