Manthan, Codefest 18 (rated, Div. 1 + Div. 2) (D. Valid BFS?)

Bismillahir Rahmanir Rahim

///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

vector<ll>g[200005];
bool vis[200005];
queue<ll>q_t,q;

bool bfs(int node)
{
    q_t.pop();
    q.push(node);
    vis[node]=true;
    while(!q.empty())
    {
        set<ll>st;
        set<ll>::iterator it;
        ll cur=q.front(),cnt=0;
        q.pop();
        for(ll i=0; i<g[cur].size(); i++)
            if(vis[g[cur][i]]==false)
            {
                cnt++;
                vis[g[cur][i]]=true;
                st.insert(g[cur][i]);
            }
            while(cnt--)
            {
                ll piku=q_t.front();
                it=st.find(piku);
                if(vis[piku]==true && it!=st.end()) q.push(piku),q_t.pop();
                else return false;
            }
            st.clear();
    }
    return true;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll node,a,b,num;
    cin>>node;
    for(ll i=1; i<node; i++)
    {
        cin>>a>>b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    for(ll i=1; i<=node; i++) cin>>num,q_t.push(num);
    if(bfs(1) && q_t.empty()) cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/1037/D

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