#include "migrations.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 10000;
vector<vector<int>> adj(N);
int diameter = 0;
int ai = 0, bi = 0;
bool Aknown = false;
bool Bknown = false;
int Abit = 0;
int Bbit = 0;
int send_message(int N_, int i, int Pi) {
assert(N_ == 10000);
adj[i].push_back(Pi);
adj[Pi].push_back(i);
vector<int> dist(i + 1), vis(i + 1);
auto Dfs = [&](auto&& self, int j) -> void {
vis[j] = 1;
for (auto node : adj[j]) {
if (vis[node]) continue;
dist[node] = dist[j] + 1;
self(self, node);
}
};
Dfs(Dfs, i);
if (dist[ai] > diameter) {
bi = i;
diameter = dist[ai];
} else if (dist[bi] > diameter) {
ai = i;
diameter = dist[bi];
}
if (i >= N - 28) {
if (Abit >= 14) Aknown = true;
if (Bbit >= 14) Bknown = true;
if (Aknown && Bknown) {
if (ai == i) {
return 1;
} else if (bi == i) {
return 2;
}
return 0;
}
if (!Aknown && !Bknown) {
if (ai == i) {
Aknown = true;
return 2;
}
if (bi == i) {
Bknown = true;
return 3;
}
return ((ai & (1 << Abit++)) ? 1 : 0);
}
if (ai == i) {
if (!Aknown) {
Aknown = true;
return 4;
}
return (2 | ((bi & (1 << Bbit++)) ? 1 : 0));
} else if (bi == i) {
if (!Bknown) {
Bknown = true;
return 4;
}
return (2 | ((ai & (1 << Abit++)) ? 1 : 0));
}
if (!Aknown) {
return ((ai & (1 << Abit++)) ? 1 : 0);
} else if (!Bknown) {
return ((bi & (1 << Bbit++)) ? 1 : 0);
}
}
return 0;
}
pair<int, int> longest_path(vector<int> S) {
int A = 0, B = 0;
bool isAknown = false;
bool isBknown = false;
int bitA = 0;
int bitB = 0;
for (int i = N - 28; i < N; i++) {
if (bitA >= 14) isAknown = true;
if (bitB >= 14) isBknown = true;
if (isAknown && isBknown) {
if (S[i] == 1) {
A = i;
} else if (S[i] == 2) {
B = i;
} else {
assert(S[i] == 0);
}
continue;
}
if (!isAknown && !isBknown) {
if (S[i] == 2) {
A = i;
isAknown = true;
continue;
}
if (S[i] == 3) {
B = i;
isBknown = true;
continue;
}
A |= (S[i] << bitA++);
continue;
}
if (S[i] == 4) {
if (!isBknown) {
isBknown = true;
B = i;
} else {
isAknown = true;
A = i;
}
continue;
}
if (S[i] >= 2) {
S[i] -= 2;
if (isAknown) {
A = i;
} else {
B = i;
}
}
if (!isAknown) {
A |= (S[i] << bitA++);
} else if (!isBknown) {
B |= (S[i] << bitB++);
}
}
return {A, B};
}
//#include "grader.cpp"
