Submission #1022656

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022656		HappyCapybara	Split the Attractions (IOI19_split)	C++17	11 / 100	52 ms	12624 KiB

split

#include "split.h"
#include<bits/stdc++.h>
using namespace std;

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q){
	int m = p.size();
	vector<vector<int>> g(n);
	for (int i=0; i<m; i++){
		g[p[i]].push_back(q[i]);
		g[q[i]].push_back(p[i]);
	}
	vector<int> res(n, 3);
	if (a > 1){
		int now;
		for (int i=0; i<n; i++){
			if (g[i].size() == 1) now = i;
		}
		int i = 0;
		int prev = -1;
		while (i < a+b){
			if (i < a) res[now] = 1;
			else res[now] = 2;
			i++;
			if (g[now][0] != prev){
				prev = now;
				now = g[prev][0];
			}
			else {
				prev = now;
				now = g[prev][1];
			}
		}
		return res;
	}
	vector<bool> seen(n, false);
	int i = 0;
	queue<int> qu;
	qu.push(0);
	while (i<b){
		int cur = qu.front();
		qu.pop();
		if (seen[cur]) continue;
		seen[cur] = true;
		res[cur] = 2;
		i++;
		for (int next : g[cur]) qu.push(next);
	}
	for (int j=0; j<n; j++){
		if (res[j] == 3){
			res[j] = 1;
			break;
		}
	}
	return res;
}

Compilation message (stderr)

split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:21:22: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized]
   21 |    if (i < a) res[now] = 1;
      |                      ^

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