Submission #926508

#TimeUsernameProblemLanguageResultExecution timeMemory
926508GrindMachineSplit the Attractions (IOI19_split)C++17
22 / 100
618 ms1048576 KiB
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "split.h"

vector<int> adj[N];
vector<int> subsiz(N);
vector<int> par(N);

void dfs1(int u, int p){
	subsiz[u] = 1;
	par[u] = p;
	trav(v,adj[u]){
		if(v == p) conts;
		dfs1(v,u);
		subsiz[u] += subsiz[v];
	}
}

pii to_col;
vector<int> ans;

void dfs2(int u, int p){
	if(!to_col.ss) return;
	to_col.ss--;
	ans[u] = to_col.ff;

	trav(v,adj[u]){
		if(v == p) conts;
		if(ans[v]) conts;
		dfs2(v,u);
	}
}

vector<int> find_split(int n, int A, int B, int C, vector<int> p, vector<int> q) {
	rep(i,sz(p)){
		int u = p[i], v = q[i];
		adj[u].pb(v), adj[v].pb(u);
	}

	dfs1(0,-1);
	ans.resize(n);

	rep(u,n){
		int s = subsiz[u];
		
		if(s >= A and n-s >= min(B,C)){
			to_col = {1,A};
			dfs2(u,par[u]);

			if(B < C){
				to_col = {2,B};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 3;
					}
				}
			}
			else{
				to_col = {3,C};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 2;
					}
				}
			}

			return ans;
		}
		
		if(s >= B and n-s >= min(A,C)){
			to_col = {2,B};
			dfs2(u,par[u]);

			if(A < C){
				to_col = {1,A};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 3;
					}
				}
			}
			else{
				to_col = {3,C};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 1;
					}
				}
			}

			return ans;
		}

		if(s >= C and n-s >= min(A,B)){
			to_col = {1,C};
			dfs2(u,par[u]);

			if(A < B){
				to_col = {1,A};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 2;
					}
				}
			}
			else{
				to_col = {2,B};
				dfs2(0,-1);
				rep(i,n){
					if(!ans[i]){
						ans[i] = 1;
					}
				}
			}

			return ans;
		}
	}

	return vector<int>(n,0);
}
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