I am not able to find any bug in my code of today's contest 662Div2 problem B.Here is my submission:- https://codeforces.me/contest/1393/submission/89277043.Here is my code also:-

Code:-

include<bits/stdc++.h>

using namespace std;

define light ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

int m=2e5; int main() { light; int n,q,i,sum=0; cin>>n; vectorb(m+1,0),c(m+1,0); for(i=0;i<n;i++) { int a;cin>>a; b[a]++; } for(i=1;i<=m;i++) { if(b[i]) c[b[i]]++; } for(i=8;i<=m;i++) sum+=c[i]; cin>>q; while(q--) { char ch;int x; cin>>ch>>x; if(ch=='+') { if(b[x]) c[b[x]]--; b[x]++;c[b[x]]++; if(b[x]==8) sum++; } else { c[b[x]]--;b[x]--; if(b[x]) c[b[x]]++; if(b[x]==7) sum--; } if(sum) cout<<"YES\n"; else if(c[6]&&(c[2]||c[3]||c[4]||c[5]||c[7])) cout<<"YES\n"; else if(c[7]&&(c[2]||c[3]||c[4]||c[5]||c[6])) cout<<"YES\n"; else if(c[4]>1||c[5]>1||c[6]>1||c[7]>1) cout<<"YES\n"; else cout<<"NO\n"; } }