#include "citymapping.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 1e3+5;
vector<int> adj[N];
int v[N], r[N], w[N];
vector<pair<long long int, int>> dis(N, {1e18+7, 0});
int pos = 0;
void un(int a, int b, int dis){
adj[a].push_back(b);
// adj[b].push_back(a);
v[pos]=a;
r[pos]=b;
w[pos]=dis;
pos++;
}
void dfs(int u, int p, int ps, long long int pd){
int st = dis[ps].second, dd = dis[ps].first;
if(adj[u].size() == 0){
un(u, st, (int) pd);
return;
}
if(adj[u].size() == 1){
int x = adj[u][0];
long long int d = get_distance(x, st);
if(d < pd) dfs(x, u, ps, d);
else{
un(u, st, (int) pd);
return;
}
return;
}
if(adj[u].size() == 2){
int x = adj[u][0];
int y = adj[u][1];
int g = gnd()%2;
if(g) swap(x, y);
long long int d = get_distance(x, st);
if(d < pd) dfs(x, u, ps, d);
else{
long long int r = get_distance(y, st);
dfs(y, u, ps, r);
}
return;
}
}
void find_roads(int n, int q, int A[], int B[], int W[]) {
// vector<pair<long long int, int>> dis (n-1);
long long int mx;
int mp;
mx = -1;
mp = -1;
for(int i = 0; i < n-1; i++){
long long int d = get_distance(1, i+2);
// dis[i]={d, i+2};
if(d > mx){
mx = d;
mp=i+2;
}
}
int rr = 0;
for(int i = 0; i < n; i++){
if(i+1 != mp){
long long int d = get_distance(mp, i+1);
dis[i-rr]={d, i+1};
}
else rr=1;
}
sort(dis.begin(), dis.end());
un(mp, dis[0].second, dis[0].first);
for(int i = 1; i < n-1; i++){
dfs(mp, -1, i, dis[i].first);
}
// for(int i = 0; i < n-1; i++){
// cout << v[i] << " " << r[i] << " " << w[i] << endl;
// }
//int aa[n-1], bb[n-1], cc[n-1];
// for(int i = 0; i < n-1; i++){
// aa[i] = v[i];
// bb[i] = r[i];
// cc[i] = w[i];
// // cout << v[i] << " " << r[i] << " " << w[i] << endl;
// }
// A = aa;
// B = bb;
// W = cc;
for (int i = 0; i < n - 1; i++) {
A[i] = v[i];
B[i] = r[i];
W[i] = w[i];
// cout << A[i] << " " << B[i] << " " << W[i] << endl;
}
return;
}
Compilation message
citymapping.cpp: In function 'void dfs(int, int, int, long long int)':
citymapping.cpp:46:11: error: 'gnd' was not declared in this scope
46 | int g = gnd()%2;
| ^~~
citymapping.cpp:25:30: warning: unused variable 'dd' [-Wunused-variable]
25 | int st = dis[ps].second, dd = dis[ps].first;
| ^~
