Submission #425114

#	Time	Username	Problem	Language	Result	Execution time	Memory
425114		alishahali1382	Split the Attractions (IOI19_split)	C++14	29 / 100	614 ms	1048580 KiB

split

#include "split.h"
#include<bits/stdc++.h>
#pragma GCC optimize("O2")
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define debug(x) {cerr<<#x<<"="<<x<<"\n";}
#define debug2(x, y) {cerr<<"{"<<#x<<", "<<#y<<"}={"<<x<<", "<<y<<"}\n";}
#define debugp(p) {cerr<<#p<<"={"<<p.first<<", "<<p.second<<"}\n";}
#define debugv(abcd) {cerr<<#abcd<<": ";for (auto dcba:abcd) cerr<<dcba<<", ";cerr<<"\n";}
#define pb push_back
#define SZ(x) ((int)x.size())
#define all(x) x.begin(), x.end()

const int inf=1000001000; // 1e9
const ll INF=10000000010000000; // 1e16
const int mod=1000000007;
const int MAXN=100010;

vector<pair<int, char>> perm;
int n, m, k, a, b, c, u, v, t, x, y, solved;
int mark[MAXN], sz[MAXN], par[MAXN];
vector<int> G[MAXN];
vector<int> out;
vector<int> topol;

void dfs1(int node){
	topol.pb(node);
	mark[node]=1;
	for (int v:G[node]) if (!mark[v]) dfs1(v);
}
int dfs2(int node){
	for (int v:G[node]) if (v!=par[node]){
		par[v]=node;
		sz[node]+=dfs2(v);
	}
	return ++sz[node];
}

vector<int> find_split(int _n, int _a, int _b, int _c, vector<int> _p, vector<int> _q){
	n=_n;
	out.resize(n, 0);
	a=_a;
	b=_b;
	c=_c;
	for (int i=0; i<n-1/*SZ(_p)*/; i++){
		int u=_p[i], v=_q[i];
		G[u].pb(v);
		G[v].pb(u);
	}
	perm.pb({a, 'a'});
	perm.pb({b, 'b'});
	perm.pb({c, 'c'});
	sort(all(perm));
	a=perm[0].first;
	b=perm[1].first;
	c=perm[2].first;
	// --------------------------


	dfs2(0);
	for (int i=1; i<n && !solved; i++){
		if (sz[i]>=a && n-sz[i]>=b){
			mark[i]=mark[par[i]]=1;
			
			dfs1(i);
			for (int j=0; j<a; j++) out[topol[j]]=1;
			topol.clear();
			
			dfs1(par[i]);
			for (int j=0; j<b; j++) out[topol[j]]=2;
			topol.clear();
			
			solved=1;
			break ;
		}
		if (sz[i]>=b && n-sz[i]>=a){
			mark[i]=mark[par[i]]=1;
			
			dfs1(i);
			for (int j=0; j<b; j++) out[topol[j]]=2;
			topol.clear();
			
			dfs1(par[i]);
			for (int j=0; j<a; j++) out[topol[j]]=1;
			topol.clear();

			solved=1;
			break ;
		}
	}

	// --------------------------
	if (!solved) return out;
	debugv(out)
	for (int i=0; i<n; i++){
		if (!out[i]) out[i]=3;
		if (out[i]==1){
			if (perm[0].second=='a') out[i]=1;
			if (perm[0].second=='b') out[i]=2;
			if (perm[0].second=='c') out[i]=3;
		}
		else if (out[i]==2){
			if (perm[1].second=='a') out[i]=1;
			if (perm[1].second=='b') out[i]=2;
			if (perm[1].second=='c') out[i]=3;
		}
		else if (out[i]==3){
			if (perm[2].second=='a') out[i]=1;
			if (perm[2].second=='b') out[i]=2;
			if (perm[2].second=='c') out[i]=3;
		}
	}
	return out;
}

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