#include <bits/stdc++.h>
using namespace std;
vector<int> adj[105];
int p[105];
int sz[105];
void dfs(int v,int pr) {
p[v]=pr;
sz[v]=1;
for(int i=0;i<adj[v].size();i++) {
int nt=adj[v][i];
if (pr!=nt) {
dfs(nt,v);
sz[v]+=sz[nt];
}
}
}
int getc(int v,int pr,int half) {
for(int i=0;i<adj[v].size();i++) {
int nt=adj[v][i];
if (pr!=nt) {
if (sz[nt]>half) {
return getc(nt,v,half);
}
}
}
return v;
}
int getp(int x) {
return p[x]==-1?x:p[x];
}
int move0(int v,int x) {
v=getp(v);
for(int i=0;i<2;i++) {
printf("%d ",v);
}
vector<int> vec;
for(int i=0;i<x*2;i++) {
if (i%2==0) {
vec.push_back(v);
v=getp(v);
}
printf("%d ",v);
}
for(int i=0;i<x*2;i++) {
if (i%2==0) {
v=vec[x-1-i/2];
}
printf("%d ",v);
}
for(int i=0;i<x*4-2;i++) {
printf("%d ",v);
}
return v;
}
int move1(int v,int x) {
printf("%d %d ",v,getp(v));
v=getp(v);
vector<int> vec;
for(int i=0;i<x*4-2;i++) {
printf("%d ",v);
}
vector<int> vec;
for(int i=0;i<x*2;i++) {
if (i&1) {
vec.push_back(v);
v=getp(v);
}
printf("%d ",v);
}
for(int i=0;i<x*2;i++) {
if (i%2==0) {
v=vec[x-1-i/2];
}
printf("%d ",v);
}
return v;
}
int main(void) {
int n;
scanf("%d",&n);
if (n!=100) {
return 0;
}
for(int i=1;i<n;i++) {
int u,v;
scanf("%d %d",&u,&v);
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs(0,-1);
int c=getc(0,-1,n/2);
dfs(c,-1);
int t=452;
printf("%d\n",t);
for(int i=0;i<n;i++) {
int now=i;
now=move0(i,2);
now=move0(now,5);
for(int j=0;j<296;j++) {
if (j%2==0) {
now=getp(now);
}
printf("%d ",now);
}
for(int j=0;j<100;j++) {
printf("%d ",now);
}
printf("\n");
}
for(int i=0;i<n;i++) {
int now=i;
now=move1(i,2);
now=move1(now,5);
for(int j=0;j<296;j++) {
if (j%2==1) {
now=getp(now);
}
printf("%d ",now);
}
for(int j=0;j<100;j++) {
printf("%d ",now);
}
printf("\n");
}
}
Compilation message
Main.cpp: In function 'void dfs(int, int)':
Main.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
11 | for(int i=0;i<adj[v].size();i++) {
| ~^~~~~~~~~~~~~~
Main.cpp: In function 'int getc(int, int, int)':
Main.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
21 | for(int i=0;i<adj[v].size();i++) {
| ~^~~~~~~~~~~~~~
Main.cpp: In function 'int move1(int, int)':
Main.cpp:68:17: error: redeclaration of 'std::vector<int> vec'
68 | vector<int> vec;
| ^~~
Main.cpp:64:17: note: 'std::vector<int> vec' previously declared here
64 | vector<int> vec;
| ^~~
Main.cpp: In function 'int main()':
Main.cpp:87:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
87 | scanf("%d",&n);
| ~~~~~^~~~~~~~~
Main.cpp:93:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
93 | scanf("%d %d",&u,&v);
| ~~~~~^~~~~~~~~~~~~~~
