Submission #940365

#	Time	Username	Problem	Language	Result	Execution time	Memory
940365		pcc	Village (BOI20_village)	C++14	0 / 100	2 ms	4440 KiB

Village

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

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


const int mxn = 1e5+10;
vector<int> tree[mxn];
int N;

namespace S1{
	ll ans;
	ll dp[mxn];
	int mx[mxn];
	void dfs(int now,int par){
		vector<int> need;
		dp[now] = 1;
		for(auto nxt:tree[now]){
			if(nxt == par)continue;
			dfs(nxt,now);
			if(dp[nxt])need.push_back(nxt);
		}
		if(need.size()>=2){
			dp[now] = 0;
			ans += need.size()*2;
			for(int i = 1;i<need.size();i++){
				mx[need[i-1]] = need[i];
			}
			mx[need.back()] = now;
			mx[now] = need[0];
			need.clear();
		}
		else if(need.size() == 1){
			dp[now] = 0;
			ans += 2;
			int a = need[0];
			mx[now] = a;
			mx[a] = now;
		}
		if(now==par&&dp[now]){
			ans += 2;
			int a = tree[now][0],b = mx[a];
			mx[b] = now,mx[now] = a;
		}
		return;
	}
	void solve(){
		dfs(1,1);
		return;
	}
}

namespace S2{
	int mx[mxn];
	ll ans;
	void solve(){
	}
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N;
	for(int i = 1;i<N;i++){
		int a,b;
		cin>>a>>b;
		tree[a].push_back(b);
		tree[b].push_back(a);
	}
	S1::solve();
	S2::solve();
	cout<<S1::ans<<' '<<S2::ans<<'\n';
	for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
	for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
	return 0;
}

Compilation message (stderr)

Village.cpp: In function 'void S1::dfs(int, int)':
Village.cpp:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |    for(int i = 1;i<need.size();i++){
      |                  ~^~~~~~~~~~~~
Village.cpp: In function 'int main()':
Village.cpp:77:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   77 |  for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
      |  ^~~
Village.cpp:77:46: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   77 |  for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
      |                                              ^~~~
Village.cpp:78:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   78 |  for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
      |  ^~~
Village.cpp:78:46: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   78 |  for(int i = 1;i<=N;i++)cout<<S1::mx[i]<<' ';cout<<'\n';
      |                                              ^~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 38
• Subtask 3: 0 / 50