Submission #314056

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
314056	2020-10-18 02:17:30	dlwocks31	Stations (IOI20_stations)	C++17	100 / 100	994 ms	1128 KiB

stations

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#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
int lbl[1000], cnt;
void dfs(int i, int p, int d, vector<vector<int>> &adj) {
  if(d % 2 == 0)
    lbl[i] = cnt++;
  for(int a: adj[i]) {
    if(a == p) continue;
    dfs(a, i, d+1, adj);
  }
  if(d % 2 == 1)
    lbl[i] = cnt++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
  cnt = 0;
  memset(lbl, 0, sizeof lbl);
  vector<int> labels(n);
  vector<vector<int>> adj(n);
  for(int i=0; i<u.size(); i++) {
    //printf("edge = %d, %d\n", u[i], v[i]);
    adj[u[i]].push_back(v[i]);
    adj[v[i]].push_back(u[i]);
  }
  dfs(0, -1, 0, adj);
  for(int i=0; i<n; i++) {
    //printf("label %d = %d\n", i, lbl[i]);
    labels[i] = lbl[i];
  }
  return labels;
 
 
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Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:20:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  for(int i=0; i<u.size(); i++) {
      |               ~^~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:38:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |  for(int i=1; i<c.size(); i++) {
      |               ~^~~~~~~~~

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