Submission #429319

#	Time	Username	Problem	Language	Result	Execution time	Memory
429319		abdzag	Stations (IOI20_stations)	C++17	0 / 100	1091 ms	564 KiB

stations

#include<bits/stdc++.h>
#include<unordered_map>
#include<unordered_set>
#include "stations.h"
#define rep(i,a,b) for(int i=int(a);i<int(b);i++)
#define rrep(i,a,b) for(int i=int(a);i>int(b);i--)
#define trav(a,v) for(auto& a: v)
#define sz(v) v.size()
#define all(v) v.begin(),v.end()
#define vi vector<int>

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const long long inf = 2e9;

using namespace std;

vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	ll counter = 0;
	vector<vector<ll>> g(n);
	rep(i, 0, n - 1) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	ll cur = 0;
	queue<ll> q;
	rep(i, 0, g.size()) {
		if (g[i].size() == 1)q.push(i);
	}
	vector<int> ans(n);
	vector<bool> visited(n);
	ll counter2 = 0;
	while (!q.empty()) {
		cur = q.front();
		q.pop();
		while (counter < n) {
			visited[cur] = 1;
			ans[cur] = counter2++;
			counter++;
			trav(a, g[cur])if (!visited[a])cur = a;
			if (g[cur].size() > 2) {
				counter2 = ((counter2 / 1000) + 1) * 1000;
				ans[cur] = 1e6;
				break;
			}

		}
	}
	
	return ans;
}

int find_next_station(int s, int t, vector<int> c) {
	int ans;
	if (s == 1e5) {
		trav(a, c) {
			if (a/1000==t/1000)ans = a;
		}
	}
	else if (s/1000==t/1000) {
		ans = -1;
		trav(a, c)ans = max(a, ans);
	}
	else if (s < t) {
		ans = -1;
		trav(a, c)ans = max(a, ans);
	}
	else {
		ans = 1e7;
		trav(a, c)ans = min(a, ans);
	}
	return ans;
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:73:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |  return ans;
      |         ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61