Submission #1232378

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232378		PlayVoltz	Railway (BOI17_railway)	C++20	23 / 100	1097 ms	39472 KiB

railway

#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

int k;
vector<vector<pii> > graph;
vector<int> cc, ans;
vector<set<pii> > s;

void dfs(int node, int par){
	for (auto num:graph[node])if (num.fi!=par){
		dfs(num.fi, node);
		if (s[num.fi].size()>=k)ans.pb(num.se);
		for (auto a:s[num.fi]){
			auto it = s[node].lower_bound(mp(a.fi, 0ll));
			if (it==s[node].end()||it->fi!=a.fi)s[node].insert(a);
			else{
				if (a.se+it->se!=cc[it->fi])s[node].insert(mp(a.fi, a.se+it->se));
				s[node].erase(it);
			}
		}
		s[num.fi].clear();
	}
}

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, m, a, b;
	cin>>n>>m>>k;
	graph.resize(n+1);
	s.resize(n+1);
	for (int i=1; i<n; ++i){
		cin>>a>>b;
		graph[a].pb(mp(b, i));
		graph[b].pb(mp(a, i));
	}
	cc.resize(m, 0);
	for (int i=0; i<m; ++i){
		cin>>cc[i];
		for (int j=0; j<cc[i]; ++j)cin>>a, s[a].insert(mp(i, 1));
	}
	dfs(1, 0);
	sort(ans.begin(), ans.end());
	cout<<ans.size()<<"\n";
	for (auto a:ans)cout<<a<<" ";
}

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 0 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25