Submission #814095

#	Time	Username	Problem	Language	Result	Execution time	Memory
814095		IBory	Chameleon's Love (JOI20_chameleon)	C++17	40 / 100	2 ms	464 KiB

chameleon

#include "chameleon.h"
#include <bits/stdc++.h>
#define pii pair<int, int>
using namespace std;

const int MAX = 505;
vector<int> G[MAX];
int checked[MAX];

void Solve(int N) {
	N <<= 1;
	for (int i = 1; i <= N; ++i) {
		for (int j = i + 1; j <= N; ++j) {
			vector<int> go = {i, j};
			int c = Query(go);
			if (c == 1) {
				G[i].push_back(j);
				G[j].push_back(i);
			}
		}
	}

	vector<pii> ans;
	for (int i = 1; i <= N; ++i) {
		if (checked[i]) continue;
		if (G[i].size() == 1) {
			ans.emplace_back(i, G[i][0]);
			checked[i] = checked[G[i][0]] = 1;
		}
		else if (G[i].size() == 3) {
			for (int k = 0; k < 3; ++k) {
				if (checked[G[i][k]]) continue;
				int a = i, b = G[i][k];
				vector<int> remain = G[a];
				for (int n : G[b]) remain.push_back(n);
				int same = 0;
				for (int n : remain) {
					if (n == a || n == b) continue;
					vector<int> go = {a, b, n};
					int c = Query(go);
					if (c == 1) same++;
				}
				if (same == 2) {
					ans.emplace_back(a, b);
					checked[a] = checked[b] = 1;
					break;
				}
			}
		}
		else exit(99);
	}

	for (auto [a, b] : ans) Answer(a, b);
}

• Subtask 1: 0 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36