Submission #1174802

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1174802	2025-03-27 11:34:05	khanhphucscratch	Stations (IOI20_stations)	C++20	Compilation error	0 ms	0 KiB

stations

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#include "stations.h"
#include<bits/stdc++.h>
using namespace std;
//Subtask 1
vector<int> ad[1005], order;
int deg[1005];
bool visited[1005];
void dfs(int u, int par)
{
    order.push_back(u); visited[u] = 1;
    for(int v : ad[u]) if(visited[v] == 0) dfs(v, u);
}
vector<int> label(int n, int k, vector<int> a, vector<int> b)
{
    for(int i = 0; i < n; i++){
        deg[i] = 0; order[i].clear(); ad[i].clear(); visited[i] = 0;
    }
    for(int i = 0; i < n-1; i++){
        deg[a[i]]++; deg[b[i]]++;
        ad[a[i]].push_back(b[i]);
        ad[b[i]].push_back(a[i]);
    }
    int root = 0;
    while(deg[root] == 2){
        root++;
    }
    dfs(root, -1);
    vector<int> ans(n);
    for(int i = 0; i < n; i++) ans[order[i]] = i;
    return ans;
 
 
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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:16:30: error: request for member 'clear' in 'order.std::vector<int>::operator[](((std::vector<int>::size_type)i))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'}
   16 |         deg[i] = 0; order[i].clear(); ad[i].clear(); visited[i] = 0;
      |                              ^~~~~