Submission #803016

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
803016	2023-08-02 18:15:44	TimDee	Stations (IOI20_stations)	C++17	100 / 100	808 ms	908 KiB

stations

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#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define forn(i,n) for(int i=0;i<n;++i)
#define pb push_back
#define all(x) x.begin(), x.end()
using ll = long long;
const int N=1e3;
int l[N], r[N];
vector<int> adj[N];
int nxt=0;
int col[N];
void dfs(int u, int p, int c) {
  col[u]=c;
  l[u]=nxt++;
  for(auto&v:adj[u]) {
    if (v==p) continue;
    dfs(v,u,!c);
  }
  r[u]=nxt++;
}
vector<int> label(int n, int k, vector<int>u, vector<int> v) {
  forn(i,n) adj[i].clear(); nxt=0;
  forn(i,n-1) {
    adj[u[i]].pb(v[i]);
    adj[v[i]].pb(u[i]);
  }
 
 
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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:4:19: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    4 | #define forn(i,n) for(int i=0;i<n;++i)
      |                   ^~~
stations.cpp:25:2: note: in expansion of macro 'forn'
   25 |  forn(i,n) adj[i].clear(); nxt=0;
      |  ^~~~
stations.cpp:25:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   25 |  forn(i,n) adj[i].clear(); nxt=0;
      |                            ^~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:60:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |    for (int i=1; i<adj.size()-1; ++i) {
      |                  ~^~~~~~~~~~~~~
stations.cpp:72:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |    for (int i=1; i<adj.size()-1; ++i) {
      |                  ~^~~~~~~~~~~~~

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