#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define lc (rt<<1)
#define rc (rt<<1|1)
#define pb push_back
#define cl(a, b) memset(a, b, sizeof(a))
typedef long long ll;
typedef pair<int, int> pi;
typedef pair<int, pi> pii;
typedef vector<int> vi;
typedef vector<pi> vii;
typedef vector<pii> viii;
const int inf = 0x3F3F3F3F;
const ll infl = 0x3F3F3F3F3F3F3F3FLL;
const int mod = 1e9 + 7;
vector<vi> b; vi p, p2, adj[1010], adj2[1010], tmp;
void build(vector<vi> b);
//void build(vector<vi> t){
// int n = t.size();
// for(int i=0; i<n; i++, cout<<endl)
// for(int j=0; j<n; j++)
// cout << t[i][j] << " ";
//}
int fd(int d, vi& p){ return d==p[d]? p[d]: p[d]=fd(p[d], p); }
inline void join(int u, int v, vi& p){
int fu = fd(u, p), fv = fd(v, p);
if(fu == fv) return;
p[fu] = fv;
}
int construct(vector<vi> a) {
int n = a.size(); b.resize(n, vi(n, 0)); p.resize(n, 0); p2.resize(n, 0);
for(int i=0; i<n; i++) p[i] = p2[i] = i;
for(int i=0; i<n; i++){
for(int j=0; j<i; j++){
if(a[i][j] == 3) return 0;
if(a[i][j]) join(i, j, p);
}
}
for(int i=0; i<n; i++){
adj[fd(i, p)].pb(i);
for(int j=0; j<i; j++){
if(!a[i][j] && fd(i, p) == fd(j, p)) return 0;
}
}
for(int i=0; i<n; i++){
if(adj[i].empty()) continue;
for(int x: adj[i])
for(int y: adj[i])
if(a[x][y] == 1) join(x, y, p2);
for(int x: adj[i])
adj2[fd(x, p2)].pb(x);
for(int x: adj[i]){
if(adj2[x].empty()) continue;
for(int xx: adj2[x])
for(int yy: adj2[x])
if(a[xx][yy] != 1) return 0;
int st = adj2[x][0], ed = adj2[x].back();
if(adj2[x].size() > 1){
b[st][ed] = b[ed][st] = 1;
for(int j=1; j<adj2[x].size(); j++){
int u = adj2[x][j-1], v = adj2[x][j];
b[u][v] = b[v][u] = 1;
}
}
tmp.pb(st);
}
if(tmp.size() == 2) return 0;
if(tmp.size() > 1){
int st = tmp[0], ed = tmp.back(); b[st][ed] = b[ed][st] = 1;
for(int j=1; j<tmp.size(); j++){
int u = tmp[j-1], v = tmp[j];
b[u][v] = b[v][u] = 1;
}
}
tmp.clear();
}
build(b);
return 1;
}
//int main(){
// ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
// //vector<vi> a = {{1,1,2,2}, {1,1,2,2}, {2,2,1,2}, {2,2,2,1}};
// vector<vi> a = {{1, 3}, {3, 1}};
// cout << construct(a) << endl;
//}
