oj.uz

답안 #376306

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
376306 2021-03-11T08:05:25 Z errorgorn Papričice (COCI20_papricice) C++17
50 / 110
 1000 ms 96452 KB 
//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl

#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define lb lower_bound
#define up upper_bound

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
//change less to less_equal for non distinct pbds, but erase will bug

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n;
vector<int> al[200005];
set<int> s[200005];
int sz[200005];

void dfs_sz(int i,int p){
	sz[i]=1;
	
	for (auto &it:al[i]){
		if (it==p) continue;
		dfs_sz(it,i);
		sz[i]+=sz[it];
	}
}

ll ans=1e9;

ll calc(int i,int j){
	int k=n-i-j;
	int arr[3]={i,j,k};
	sort(arr,arr+3);
	return arr[2]-arr[0];
}

void dfs(int i,int p){
	
	for (auto &it:al[i]){
		if (it==p) continue;
		
		dfs(it,i);
		auto temp=s[i];
		for (auto &it:s[it]){
			s[i].insert(it);
			for (auto &it2:temp) ans=min(ans,calc(it,it2));
		}
	}
	
	for (auto &it:s[i]) ans=min(ans,calc(sz[i]-it,it));
	
	s[i].insert(sz[i]);
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n;
	
	int a,b;
	rep(x,1,n){
		cin>>a>>b;
		al[a].pub(b);
		al[b].pub(a);
	}
	
	dfs_sz(1,-1);
	dfs(1,-1);
	
	cout<<ans<<endl;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14424 KB Output is correct
2 Correct 10 ms 14592 KB Output is correct
3 Correct 10 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14424 KB Output is correct
2 Correct 10 ms 14592 KB Output is correct
3 Correct 10 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 12 ms 14700 KB Output is correct
7 Correct 16 ms 15340 KB Output is correct
8 Correct 12 ms 14700 KB Output is correct
9 Correct 12 ms 14700 KB Output is correct
10 Correct 14 ms 14956 KB Output is correct

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14424 KB Output is correct
2 Correct 10 ms 14592 KB Output is correct
3 Correct 10 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 12 ms 14700 KB Output is correct
7 Correct 16 ms 15340 KB Output is correct
8 Correct 12 ms 14700 KB Output is correct
9 Correct 12 ms 14700 KB Output is correct
10 Correct 14 ms 14956 KB Output is correct
11 Correct 512 ms 46476 KB Output is correct
12 Execution timed out 1044 ms 96452 KB Time limit exceeded
13 Halted 0 ms 0 KB -