#include "friend.h"
#include <bits/stdc++.h>
int findSample(int n, int confidence[], int host[], int protocol[]) {
/*
if (n <= 10) {
std::vector<std::vector<bool>> isFriend(n, std::vector<bool>(n));
for (int x = 1; x < n; ++x) {
const int h = host[x], type = protocol[x];
if (type == 0) {
isFriend[h][x] = isFriend[x][h] = true;
} else if (type == 1) {
for (int i = 0; i < n; ++i) {
if (isFriend[h][i]) {
isFriend[i][x] = isFriend[x][i] = true;
}
}
} else if (type == 2) {
for (int i = 0; i < n; ++i) {
if (isFriend[h][i]) {
isFriend[i][x] = isFriend[x][i] = true;
}
}
isFriend[h][x] = isFriend[x][h] = true;
}
}
int answer = 0;
for (int bits = 0; bits < (1 << n); ++bits) {
bool isOk = true;
for (int i = 0; i < n; ++i) {
if (not(bits & (1 << i))) {
continue;
}
for (int j = 0; j < n; ++j) {
if (not(bits & (1 << j))) {
continue;
}
if (isFriend[i][j]) {
isOk = false;
}
}
}
int sum = 0;
if (isOk) {
for (int i = 0; i < n; ++i) {
if (not(bits & (1 << i))) {
continue;
}
sum += confidence[i];
}
answer = std::max(answer, sum);
}
}
return answer;
}*/
bool ex0 = false, ex1 = false, ex2 = false;
for (int i = 1; i < n; ++i) {
if (protocol[i] == 0) {
ex0 = true;
}
if (protocol[i] == 1) {
ex1 = true;
}
if (protocol[i] == 2) {
ex2 = true;
}
}
if (ex1 and ex0 and (not ex2)) {
// not prove
std::vector<std::vector<bool>> isFriend(n, std::vector<bool>(n));
for (int x = 1; x < n; ++x) {
const int h = host[x], type = protocol[x];
if (type == 0) {
isFriend[h][x] = isFriend[x][h] = true;
} else if (type == 1) {
for (int i = 0; i < n; ++i) {
if (isFriend[h][i]) {
isFriend[i][x] = isFriend[x][i] = true;
}
}
}
}
std::vector<int> color(n, -1);
int answer = 0;
for (int f = 0; f < n; ++f) {
if (color[f] != -1) {
continue;
}
int a = 0, b = 0;
auto dfs = [&](auto &&self, const int v, const bool c) -> void {
if (c) {
++a;
} else {
++b;
}
color[v] = c;
for (int t = 0; t < n; ++t) {
if ((not isFriend[v][t]) or color[t] != -1) {
continue;
}
self(self, t, not c);
}
};
dfs(dfs, f, false);
answer += std::max(a, b);
}
return answer;
}
return -1;
}
