Submission #821480

#	Time	Username	Problem	Language	Result	Execution time	Memory
821480		Baytoro	Split the Attractions (IOI19_split)	C++17	18 / 100	455 ms	1048576 KiB

split

#include "split.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
const int maxN=1e5+5;
vector<int> ans,g[maxN];
int used[maxN];
void dfs(int x, int &d, int c){
	if(d<=0) return;
	ans[x]=c;
	used[x]=1;
	for(auto it: g[x]){
		if(used[it]) continue;
		dfs(it,--d,c);
	}
}
int sz[maxN];
int N;
int A,B,C;
int u=-1,v=-1;
void DFS(int x, int p){
	sz[x]=1;
	for(auto it: g[x]){
		if(it==p) continue;
		DFS(it,x);
		if(sz[it]>=B && N-sz[it]>=A) u=x,v=it;
		sz[x]+=sz[it];
	}
}
void col(int x, int p, int c){
	ans[x]=c;
	for(auto it: g[x]){
		if(it==p) continue;
		col(it,x,c);
	}
}
vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
	N=n;int m=p.size();
	ans.resize(n);
	A=a,B=b,C=c;
	if(A>B) swap(A,B);
	if(B>C) swap(B,C);
	if(A>B) swap(A,B);
	bool ok=1,sb1=1;
	for(int i=0;i<m;i++){
		g[p[i]].push_back(q[i]);
		g[q[i]].push_back(p[i]);
		if(g[p[i]].size()>2) sb1=0;
		if(g[q[i]].size()>2) sb1=0;
	}
	if(sb1){
		for(int i=0;i<n;i++){
			if(g[i].size()==1 && ok){
				dfs(i,b,2);
				ok=0;
			}
			else if(g[i].size()==1 && !ok){
				dfs(i,a,1);
				break;
			}
		}
		if(ok){
			dfs(0,b,2);
			for(int i=0;i<n;i++){
				if(!used[i]){
					dfs(i,a,1);
					break;
				}
			}
		}
		for(int i=0;i<n;i++){
			if(!ans[i]) ans[i]=3;
		}
		return ans;
	}
	else if(a==1){
		dfs(0,b,2);
		bool ok=0;
		for(int i=0;i<n;i++){
			if(ans[i]) continue;
			ans[i]=3;
			if(!ok) ans[i]=1;
			ok=1;
		}
		return ans;
	}
	else{
		int x,y;
		if(A==a){
			x=1;
			if(B==b) y=2;
			else y=3;
		}
		else if(A==B){
			x=2;
			if(B==a) y=1;
			else y=3;
		}
		else{
			x=3;
			if(B==a) y=1;
			else y=2;
		}
		DFS(0,0);
		if(u==-1)
			return ans;
		col(v,u,y);
		for(int i=0;i<n;i++){
			if(!ans[i]) ans[i]=x;
		}
		return ans;
	}
}

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36