Codeforces Round #790 (Div. 4) (G. White-Black Balanced Subtrees)

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;

const int N=1e5;
vector<ll>g[N];
bool vis[N];
string str;
ll blacknode[N],whitenode[N];

void dfs(ll node)
{
    vis[node]=true;
    ll black=0,white=0;
    if(str[node-1]=='W')
        white++;
    else
        black++;
    for(ll i=0; i<g[node].size(); i++)
        if(vis[g[node][i]]==false)
        {
            dfs(g[node][i]);
            black+=blacknode[g[node][i]];
            white+=whitenode[g[node][i]];
        }
    blacknode[node]=black;
    whitenode[node]=white;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll tst,node,num;
    cin>>tst;
    while(tst--)
    {
        cin>>node;
        for(ll i=1;i<=node;i++)
            blacknode[i]=whitenode[i]=0,vis[i]=false,g[i].clear();
        for(ll i=2; i<=node; i++)
            cin>>num,g[num].push_back(i);
        cin>>str;
        dfs(1);
        ll cnt=0;
        for(ll i=1;i<=node;i++)
            if(blacknode[i]==whitenode[i]) cnt++;
        cout<<cnt<<endl;
    }
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/1676/G

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