#include <bits/stdc++.h>
#include "island.h"
namespace {
const int invalid_v_range = 1;
const int invalid_k_range = 2;
const int query_limit_exceeded = 3;
const int invalid_xy_range = 4;
const int no_edge = 5;
const int answer_twice = 6;
const int invalid_answer_times = 7;
int N, L, ok;
std::vector<int> A, B, answered;
std::vector<std::vector<int>> g, dist, que;
std::vector<std::pair<int, int>> p;
int query_count = 0;
int answer_count = 0;
void wronganswer(int code) {
printf("Wrong Answer [%d]\n", code);
exit(0);
}
void dfs(int now, int pre, std::vector<std::vector<int>> &g,
std::vector<int> &dist) {
for (int nxt : g[now]) {
if (nxt == pre) {
continue;
}
dist[nxt] = dist[now] + 1;
dfs(nxt, now, g, dist);
}
}
} // namespace
int query(int v, int k) {
if (v < 1 || N < v) {
wronganswer(invalid_v_range);
}
if (k < 1 || N - 1 < k) {
wronganswer(invalid_k_range);
}
query_count++;
if (query_count > L) {
wronganswer(query_limit_exceeded);
}
return que[v - 1][k] + 1;
}
void answer(int x, int y) {
if (x < 1 || N < x || y < 1 || N < y) {
wronganswer(invalid_xy_range);
}
if (x > y) {
std::swap(x, y);
}
answer_count++;
if (answer_count > N - 1) {
wronganswer(invalid_answer_times);
}
ok = -1;
for (int i = 0; i < N - 1; i++) {
if (A[i] == x && B[i] == y) {
if (answered[i] != 0) {
wronganswer(answer_twice);
}
ok = i;
}
}
if (ok == -1) {
wronganswer(no_edge);
}
answered[ok] = 1;
}
using namespace std;
void solve(int n,int l){
map<int,int>d;
queue<int>o;
d[1]=1;
int x=query(1,1);
o.push(x);
d[x]=1;
answer(1,x);
x=query(1,2);
o.push(x);
d[x]=1;
answer(1,x);
x=query(1,3);
o.push(x);
d[x]=1;
answer(1,x);
int c=4;
while (c<n){
int h=o.front();
o.pop();
x=query(h,1);
if (d[x]){
x=query(h,2);
if (d[x]){
continue;
}
}
d[x]=1;
c++;
answer(x,h);
o.push(x);
}
return;
}
int main(int argc, char **argv) {
if (scanf("%d", &N) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
if (scanf("%d", &L) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
A.resize(N - 1);
B.resize(N - 1);
answered.resize(N - 1, 0);
g.resize(N);
dist.resize(N, std::vector<int>(N));
que.resize(N);
for (int i = 0; i < N - 1; i++) {
if (scanf("%d", &A[i]) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
if (scanf("%d", &B[i]) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
}
for (int i = 0; i < N - 1; i++) {
if (A[i] >= B[i]) {
std::swap(A[i], B[i]);
}
g[A[i] - 1].emplace_back(B[i] - 1);
g[B[i] - 1].emplace_back(A[i] - 1);
}
for (int i = 0; i < N; i++) {
dist[i][i] = 0;
dfs(i, -1, g, dist[i]);
p.clear();
for (int j = 0; j < N; j++) {
p.emplace_back(dist[i][j], j);
}
std::sort(p.begin(), p.end());
for (int j = 0; j < N; j++) {
que[i].emplace_back(p[j].second);
}
}
solve(N, L);
if (answer_count != N - 1) {
wronganswer(invalid_answer_times);
}
printf("Accepted: %d\n", query_count);
return 0;
}
