Submission #342403

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
342403	2021-01-02 05:27:16	Ta180m	Stations (IOI20_stations)	C++17	100 / 100	932 ms	1464 KiB

stations

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#include "stations.h"
#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
using ll = long long;
using ii = pair<int, int>;
constexpr int MX = 1e3+5;
int cnt, in[MX], out[MX];
vector<int> labels, G[MX];
void dfs(int u, int p, int d) {
  in[u] = cnt++;
  for (int v : G[u]) if (v != p) dfs(v, u, d+1);
  out[u] = cnt++;
  labels[u] = (d%2 == 0 ? in[u] : out[u]);
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
  for (int i = 0; i < n; ++i) G[i].clear();
  for (int i = 0; i < n-1; ++i)
    G[u[i]].push_back(v[i]), G[v[i]].push_back(u[i]);
  labels.resize(n, 0);
  cnt = 0;
  dfs(0, -1, 0);
  /*for (int i = 0; i < n; ++i) {
    cout << in[i] << ' ' << out[i] << '\n';
  }*/
 
 
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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:36:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |  for (int i = 0; i < labels.size(); ++i)
      |                  ~~^~~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |    for (int i = 0; i < c.size(); ++i) {
      |                    ~~^~~~~~~~~~
stations.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |    for (int i = 0; i < c.size(); ++i) {
      |                    ~~^~~~~~~~~~
stations.cpp:92:1: warning: control reaches end of non-void function [-Wreturn-type]
   92 | }
      | ^

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