Submission #622310

#	Time	Username	Problem	Language	Result	Execution time	Memory
622310		Jomnoi	Split the Attractions (IOI19_split)	C++17	18 / 100	78 ms	13888 KiB

split

#include <bits/stdc++.h>
#include "split.h"
using namespace std;
 
const int MAX_N = 1e5 + 5;
 
int N, M, A, B, C;
int sz[MAX_N];
vector <int> graph[MAX_N];
vector <int> res;
 
void dfs(int u, int p, int a, int &A) {
	A--;
	res[u] = a;
	for(auto v : graph[u]) {
		if(res[v] == p and A > 0) {
			dfs(v, p, a, A);
		}
	}
}
 
vector <int> find_split(int n, int a, int b, int c, vector <int> p, vector <int> q) {
	N = n, M = p.size(), A = a, B = b, C = c;
	res.resize(N, 0);
 
	for(int i = 0; i < M; i++) {
		graph[p[i]].push_back(q[i]);
		graph[q[i]].push_back(p[i]);
	}

	int rt = 0;
	for(int i = 0; i < N; i++) {
		if(graph[i].size() == 1) {
			rt = i;
			break;
		}
	}
 
	dfs(rt, 0, 2, B);
	for(int i = 0; i < N; i++) {
		if(res[i] == 0) {
			dfs(i, 0, -1, B = A);
			if(B == 0) {
				dfs(i, -1, 1, A);
				break;
			}
		}
	}
	for(int i = 0; i < N; i++) {
		if(res[i] != 1 and res[i] != 2) {
			res[i] = 3;
			C--;
		}
	}
 
	if(A != 0 or B != 0 or C != 0) {
		fill(res.begin(), res.end(), 0);
	}
	return res;
}

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