#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pii pair<int,int>
const int mxN = 1e5 + 1;
using namespace std;
vector<int> labelss,pre,post;
vector<vector<int>>gr;
int id;
void dfs(int u,int par){
pre[u] = ++id;
for(auto x : gr[u]){
if(x == par) continue;
dfs(x,u);
}
post[u] = ++id;
}
void labeling(int u,int par,int d){
if(d % 2) labelss[u] = pre[u];
else labelss[u] = post[u];
cout<<labelss[u]<<' ';
for(auto x : gr[u]){
if(x == par) continue;
labeling(x,u,d + 1);
}
}
vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
gr.resize(n + 1);
labelss.resize(n);
post.resize(n);
pre.resize(n);
for(int i = 0;i < n - 1;i++){
gr[u[i]].push_back(v[i]);
gr[v[i]].push_back(u[i]);
}
dfs(0,-1);
labeling(0,-1,0);
cout<<'\n';
return labelss;
}
int find_next_station(int s, int t, std::vector<int> c) {
bool pst = 1;
int root = -1;
for(auto x : c) {
if(x > s) pst = 0;
}
for(auto x : c){
if(pst) root == -1 ? root = x : root = min(root,x);
else root = max(x,root);
}
int id = root;
if(pst){
for(auto x : c){
if(x > t) break;
else id = x;
}
if(s < t) id = root;
}else{
for(auto x : c){
if(x > t){
id = x;
break;
}
}
}
return id;
}
static int max_label = 0;
static int r, n, k, q;
static std::vector<int> u, v, labels, answers;
static std::map<int, int> reverse_labels;
static std::vector<std::vector<int>> adjlist;
static int s, t, w;
static std::vector<int> c;
int main() {
assert(scanf("%d", &r) == 1);
for (int tc = 0; tc < r; tc++) {
assert(scanf("%d%d", &n, &k) == 2);
u.resize(n - 1);
v.resize(n - 1);
adjlist.clear();
adjlist.resize(n);
for (int i = 0; i < n - 1; i++) {
assert(scanf("%d%d", &u[i], &v[i]) == 2);
adjlist[u[i]].push_back(v[i]);
adjlist[v[i]].push_back(u[i]);
}
labels = label(n, k, u, v);
if ((int)labels.size() != n) {
printf("Number of labels not equal to %d\n", n);
exit(0);
}
reverse_labels.clear();
for (int i = 0; i < n; i++) {
if (labels[i] < 0 || labels[i] > k) {
printf("Label not in range 0 to %d\n", k);
exit(0);
}
if (reverse_labels.find(labels[i]) != reverse_labels.end()) {
printf("Labels not unique\n");
exit(0);
}
reverse_labels[labels[i]] = i;
if (labels[i] > max_label) {
max_label = labels[i];
}
}
assert(scanf("%d", &q) == 1);
for (int i = 0; i < q; i++) {
assert(scanf("%d%d%d", &s, &t, &w) == 3);
c.clear();
for (int v : adjlist[s]) {
c.push_back(labels[v]);
}
std::sort(c.begin(), c.end());
int answer = find_next_station(labels[s], labels[t], c);
if (!std::binary_search(c.begin(), c.end(), answer)) {
printf("Label %d returned by find_next_station not found in c\n", answer);
exit(0);
}
answers.push_back(reverse_labels[answer]);
}
}
printf("%d\n", max_label);
for (int index : answers) {
printf("%d\n", index);
}
exit(0);
}
Compilation message
/usr/bin/ld: /tmp/ccaAdZwS.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccxbQMeQ.o:stations.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
