Submission #603522

#	Time	Username	Problem	Language	Result	Execution time	Memory
603522		SeDunion	Split the Attractions (IOI19_split)	C++17	0 / 100	7 ms	9940 KiB

split

#include "split.h"
#include<algorithm>
#include<iostream>
#include<vector>
#include<assert.h>

using namespace std;
const int N = 2e5 + 123;

vector<int>g[N];

int used[N];

int n, a, b, c;

vector<int>vec, ans;

int av = -1, bv = -1;

int tin[N], tout[N], timer, sz[N];

void dfs(int v) {
	cout << v << " v\n";
	used[v] = 1;
	sz[v] = 1;
	tin[v] = timer++;
	tout[v] = timer++;
	for (int to : g[v]) if (!used[to]) {
		dfs(to);
		sz[v] += sz[to];
		if (sz[to] >= a && n - sz[to] >= b) {
			av = to, bv = v;
		}
	}
}

bool cmp(int a, int b) {
	return tin[a] < tin[b];
}

bool upper(int a, int b) { return tin[a] <= tin[b] && tout[a] >= tout[b]; } 

vector<int> find_split(int n_, int a_, int b_, int c_, vector<int> p, vector<int> q) {
	n = 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);
	// a <= b <= c
	// a <= n/3 ?
	// b <= n/2 ?
	int m = p.size();
	for (int i = 0 ; i < m ; ++ i) {
		g[p[i]].emplace_back(q[i]);
		g[q[i]].emplace_back(p[i]);
	}
	int root = 0;
	for (int i = 0 ; i < n ; ++ i) {
		if ((int)g[i].size() == 1) root = i;
	}
	ans = vector<int>(n, 3);
	dfs(root);
	if (av == -1) return vector<int>(n, 0);
	vector<int>vec;
	for (int i = 0 ; i < n ; ++ i) {
		vec.emplace_back(i);
	}
	for (int i = 0 ; i < n ; ++ i) cout << tin[i] << " ";
	cout << " t\n";
	sort(vec.begin(), vec.end(), cmp);
	for (int v : vec) cout << v << " ";
	cout << " ve\n";
	for (int v : vec) {
		if (a && upper(av, v)) ans[v] = 1, a--;
		if (b && !upper(av, v)) ans[v] = 2, b--;
	}
	assert(a == 0 && b == 0);
	return ans;
}

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