Submission #825378

#	Time	Username	Problem	Language	Result	Execution time	Memory
825378		serifefedartar	Regions (IOI09_regions)	C++17	5 / 100	69 ms	15164 KiB

regions

#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MOD 1000000007
#define LOGN 20
#define MAXN 200005
#define pb push_back

vector<vector<int>> graph;
int ans[505][505], cnt[505][505];
int region[MAXN];
void dfs(int node, int parent) {
	for (int i = 0; i <= 500; i++) {
		cnt[node][i] = cnt[parent][i];
		ans[i][region[node]] += cnt[node][i];
	}
	cnt[node][region[node]]++;

	for (auto u : graph[node]) {
		dfs(u, node);
	}
}

int main() {
    fast
    int N, R, Q, S, r1, r2;
    cin >> N >> R >> Q >> region[1];

    graph = vector<vector<int>>(N+1, vector<int>());
    for (int i = 2; i <= N; i++) {
    	cin >> S >> region[i]; 
    	graph[S].pb(i);
    }

    if (R <= 500) {
    	dfs(1, 1);
    	while (Q--) {
    		cin >> r1 >> r2;
    		cout << ans[r1][r2] << endl;
    	}
    } else {
    	while (Q--) {
    		int x, y;
    		cin >> x >> y;
    		cout << x << " " << y << endl;
    	}
    }
}

• Subtask 1: 5 / 15
• Subtask 2: 0 / 85