#include <bits/stdc++.h>
using namespace std;
void build(vector<vector<int>> b);
int construct(vector<vector<int>> p) {
int n = (int) p.size();
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
if(p[i][j] == 3) return 0;
if(p[i][j] != p[j][i]) return 0;
}
}
vector<vector<int>> put(n, vector<int>(n));
vector<bool> vis(n);
vector<bool> inTree(n);
for(int i = 0; i < n; i++) {
if(vis[i]) continue;
queue<int> q;
vector<int> f, s;
q.push(i);
vis[i] = true;
while(!q.empty()) {
auto curr = q.front();
f.push_back(curr);
q.pop();
for(int next = 0; next < n; next++) {
if(p[curr][next] == 0) continue;
if(p[curr][next] == 1) {
if(!vis[next]) {
vis[next] = true;
q.push(next);
}
}
else {
if(!vis[next]) {
vis[next] = true;
s.push_back(next);
}
}
}
}
for(int i = 0; i < (int) f.size(); i++) {
for(int j = i + 1; j < (int) f.size(); j++) {
if(p[f[i]][f[j]] != 1 || p[f[j]][f[i]] != 1) return 0;
}
}
for(int i = 0; i < (int) f.size() - 1; i++) {
put[f[i]][f[i + 1]] = 1, put[f[i + 1]][f[i]] = 1;
inTree[f[i]] = 1;
}
if(s.empty()) continue;
if((int) s.size() == 1) return 0;
for(int i = 0; i < (int) s.size() - 1; i++) {
put[s[i]][s[i + 1]] = 1, put[s[i + 1]][s[i]] = 1;
}
put[i][s[0]] = 1, put[s[0]][i] = 1;
put[i][s.back()] = 1, put[s.back()][i] = 1;
}
build(put);
return 1;
}
