Submission #1083271

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083271		rayan_bd	Regions (IOI09_regions)	C++17	0 / 100	246 ms	131072 KiB

regions

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define ll long long

const int mxN = 2e5 + 5000;

ll color[mxN][505];
vector<ll> adj[mxN];
ll hd[mxN],out[mxN];
unordered_map<ll,vector<ll>> mp;

void solve(ll tc) {
  ll n,r,q,r1,r2,super;cin>>n>>r>>q;

  cin>>hd[1];

  mp[hd[1]].pb(1);
  color[1][hd[1]]=1;

  for(ll i=2;i<=n;++i){
  	cin>>super>>hd[i];
  	adj[i].pb(super);
  	mp[hd[i]].pb(i);
  	color[i][hd[i]]=1;
  	++out[super];
  }

  set<ll> st;
  for(ll i=1;i<=n;++i){
  	if(out[i]==0){
  		st.insert(i); 
  	}
  }

  while(st.size()){
  	ll u=*st.begin();
  	st.erase(u);
  	for(auto it:adj[u]){
  		for(ll i=1;i<505;++i){
  			color[it][i]+=color[u][i];
  		}
  		if(--out[it]==0) st.insert(it);
  	}
  }


  while(q--){
  	cin>>r1>>r2;
  	ll ans=0;
  	for(auto it:mp[hd[r1]]){
  		ans+=color[it][r2];
  	}
  	cout.flush()<<ans<<'\n';
    cout.flush();
  }

}

void testing(){
	#ifndef ONLINE_JUDGE
    freopen("input.in","r",stdin);
    freopen("output.out","w",stdout);
    #endif
}

int main() {
    
	//testing();

    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    solve(0);

    return 0;
}

Compilation message (stderr)

regions.cpp: In function 'void testing()':
regions.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |     freopen("input.in","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
regions.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen("output.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 85