Submission #320465

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
320465	2020-11-08 20:04:44	nikatamliani	Stations (IOI20_stations)	C++14	100 / 100	1097 ms	1324 KiB

stations

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#include <bits/stdc++.h>
#include "stations.h"
using namespace std;
void dfs(int x, int p, vector < vector < int > > &adj, vector < int > &labels, int depth) {
  static int timer = -1;
  ++timer;
  if(depth) labels[x] = timer;
  for(int to : adj[x]) {
    if(to != p) {
      dfs(to, x, adj, labels, depth ^ 1);
    }
  }
  ++timer;
  if(!depth) labels[x] = timer;
}
vector < int > label(int n, int k, vector < int > u, vector < int > v) {
  vector < int > labels(n);
  vector< vector < int > > adj(n, vector < int >());
  for(int i = 0; i < n - 1; ++i) {
    adj[u[i]].push_back(v[i]);
    adj[v[i]].push_back(u[i]);
  }
  dfs(0, -1, adj, labels, 0);
  vector < vector < int > > g;
  for(int i = 0; i < n; ++i) {
      g.push_back({labels[i], i});
  }
  sort(g.begin(), g.end());
  for(int i = 0; i < n; ++i) {
      labels[g[i][1]] = i;
 
 
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Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:41:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |      for(int i = 0; i < c.size(); ++i) {
      |                     ~~^~~~~~~~~~
stations.cpp:40:10: warning: unused variable 'my_out' [-Wunused-variable]
   40 |      int my_out = c.back();
      |          ^~~~~~
stations.cpp:54:22: warning: variable 'my_out' set but not used [-Wunused-but-set-variable]
   54 |      int my_in = -1, my_out = -1;
      |                      ^~~~~~
stations.cpp:85:1: warning: control reaches end of non-void function [-Wreturn-type]
   85 | }
      | ^

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