#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 Aunknown = true;
bool Bunknown = true;
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 (!(Aunknown && Abit < 14) && !(Bunknown && Bbit < 14)) {
if (ai == i) {
return 1;
} else if (bi == i) {
return 2;
}
return 0;
}
if (ai == i) {
if (Aunknown && Abit < 14) {
Aunknown = false;
return 4;
} else {
return (2 | ((bi & (1 << Bbit++)) ? 1 : 0));
}
} else if (bi == i) {
if (Bunknown && Bbit < 14) {
Bunknown = false;
return 4;
} else {
return (2 | ((ai & (1 << Abit++)) ? 1 : 0));
}
}
if (Aunknown && Abit < 14) {
return ((ai & (1 << Abit++)) ? 1 : 0);
} else if (Bunknown && Bbit < 14) {
return ((bi & (1 << Bbit++)) ? 1 : 0);
}
}
return 0;
}
pair<int, int> longest_path(vector<int> S) {
int A = 0, B = 0;
bool isAunknown = true;
bool isBunknown = true;
int bitA = 0;
int bitB = 0;
for (int i = N - 28; i < N; i++) {
if (!(isAunknown && bitA < 14) && !(isBunknown && bitB < 14)) {
if (S[i] == 1) {
A = i;
} else if (S[i] == 2) {
B = i;
}
continue;
}
if (S[i] == 4) {
if (isBunknown && bitB < 14) {
isBunknown = false;
B = i;
} else {
isAunknown = false;
A = i;
}
continue;
}
if (S[i] >= 2) {
S[i] -= 2;
if (!(isAunknown && bitA < 14)) {
A = i;
if (isBunknown && bitB < 14) {
B |= (S[i] << bitB++);
}
} else {
B = i;
if (isAunknown && bitA < 14) {
A |= (S[i] << bitA++);
}
}
continue;
}
if (isAunknown && bitA < 14) {
A |= (S[i] << bitA++);
} else if (isBunknown && bitB < 14) {
B |= (S[i] << bitB++);
}
}
return {A, B};
}
//#include "grader.cpp"
