Submission #1128692

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128692		rayan_bd	Regions (IOI09_regions)	C++20	0 / 100	159 ms	196608 KiB

regions

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(),x.end()

const int mxN = 2e5+5000;

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


vector<int> adj[mxN];
int dp[mxN][505];

void dfs(int u){
	for(auto it:adj[u]){
		dfs(it);
		for(int i=1;i<=500;++i){
			dp[u][i]+=dp[it][i];
		}
	}
}


int main(){
//	io();

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

	memset(dp,0,sizeof(dp));
	
	int n,r,q,u,man,reg;cin>>n>>r>>q;
	cin>>u;
	++dp[1][u];
	dp[1][0]=u;
	for(int i=2;i<=n;++i){
		cin>>u>>man;
		adj[u].pb(i);
		++dp[i][man];
		dp[i][0]=man;
	}

	dfs(1);


	while(q--){
		cin>>man>>reg;
		int ans=0;
		for(int i=1;i<=n;++i){
			if(dp[i][0]!=man) continue;
			ans+=dp[i][reg];
		}
		cout<<ans<<endl;
	}

	return 0;
}

Compilation message (stderr)

regions.cpp: In function 'void io()':
regions.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen("input.in","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
regions.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen("output.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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