Submission #726011

#	Time	Username	Problem	Language	Result	Execution time	Memory
726011		alvingogo	Split the Attractions (IOI19_split)	C++14	0 / 100	70 ms	9772 KiB

split

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

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
	int m=p.size();
	vector<vector<int> > e(n);
	for(int i=0;i<m;i++){
		e[p[i]].push_back(q[i]);
		e[q[i]].push_back(p[i]);
	}
	if(m==n-1){
		vector<int> sz(n),fa(n);
		function<void(int,int)> dfs=[&](int r,int f){
			fa[r]=f;
			sz[r]=1;
			for(auto h:e[r]){
				if(h!=f){
					dfs(h,r);
					sz[r]+=sz[h];
				}
			}
		};
		vector<int> ans(n);
		function<int(int,int,int,int)> dfs2=[&](int r,int f,int p,int u){
			ans[r]=p;
			u--;
			if(u==0){
				return u;
			}
			for(auto h:e[r]){
				if(h!=f){
					u=dfs2(h,r,p,u);
					if(u==0){
						return u;
					}
				}
			}
			return u;
		};
		dfs(0,0);
		int ak[3]={1,2,3};
		if(a>b){
			swap(a,b);
			swap(ak[0],ak[1]);
		}
		if(b>c){
			swap(b,c);
			swap(ak[1],ak[2]);
		}
		if(a>b){
			swap(a,b);
			swap(ak[0],ak[1]);
		}
		for(int i=0;i<n;i++){
			int x=sz[i],y=n-sz[i];
			if(x>=a && y>=b){
				dfs2(i,fa[i],ak[0],a);
				dfs2(fa[i],i,ak[1],b);
				for(int j=0;j<n;j++){
					if(!ans[j]){
						ans[j]=ak[2];
					}
				}
				return ans;
			}
		}
		return ans;
	}
	vector<int> res;
	for(int i=0;i<n;i++){

	}
	return res;
}

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