Submission #102108

#	Time	Username	Problem	Language	Result	Execution time	Memory
102108		figter001	Regions (IOI09_regions)	C++17	0 / 100	9 ms	4992 KiB

regions

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int nax = 2e5 + 50;
const int rax = 510;

int r[nax],dp[rax][rax],ans[rax][rax];
int n,R,q;
vector<int> g[nax];

void dfs(int u,int p){

	for(int v : g[u]){
		if(v == p)
			continue;
		dfs(v,u);
		dp[u][r[v]]++;
	}

	if(p != -1){
		for(int i=1;i<=R;i++)
			dp[p][i] += dp[u][i];
	}
	for(int i=1;i<=R;i++){
		ans[r[u]][i] += dp[u][i];
	}
}

int main(){
	#ifndef ONLINE_JUDGE
		freopen("input.txt","r",stdin);
	#endif
	cin>>n>>R>>q;
	cin>>r[1];
	for(int i=2;i<=n;i++){
		int p;
		cin>>p>>r[i];
		g[p].push_back(i);
	}
	dfs(1,0);
	int a,b;
	for(int i=0;i<q;i++){
		scanf("%d%d",&a,&b);
		printf("%d\n", ans[a][b]);
		fflush(stdout);
	}
}

Compilation message (stderr)

regions.cpp: In function 'int main()':
regions.cpp:35:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen("input.txt","r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a,&b);
   ~~~~~^~~~~~~~~~~~~~

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