#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
void build(std::vector<std::vector<int>> _b);
vector<int>parent;
int UF(int u) {
if(parent[u] == u)
return u;
return parent[u] = UF(parent[u]);
}
int construct(vector<vector<int>> p) {
const int n = (int)p.size();
parent.resize(n);
vector<vector<int>>ans(n,vector<int>(n,0));
for(int i = 0 ; i < n ; i++)
parent[i] = i;
for(int i = 0 ; i < n ; i++) {
for(int j = i+1 ; j < n ; j++) {
if(p[i][j] == 3) {
return 0; // invalid
}
assert(p[i][j] == p[j][i]);
if(p[i][j] == 1) {
int u = UF(i), v = UF(j);
if(u != v) {
ans[i][j] = ans[j][i] = 1;
parent[u] = v;
}
}
}
}
for(int i = 0 ; i < n ; i++) {
for(int j = i+1 ; j < n ; j++) {
if(p[i][j] == 0 && UF(i) == UF(j)) {
return 0;
}
}
}
build(ans);
return 1;
}
/*
static int n;
static std::vector<std::vector<int>> p;
static std::vector<std::vector<int>> b;
static bool called = false;
static void check(bool cond, std::string message) {
if (!cond) {
printf("%s\n", message.c_str());
fclose(stdout);
exit(0);
}
}
void build(std::vector<std::vector<int>> _b) {
check(!called, "build is called more than once");
called = true;
check((int)_b.size() == n, "Invalid number of rows in b");
for (int i = 0; i < n; i++) {
check((int)_b[i].size() == n, "Invalid number of columns in b");
}
b = _b;
}
int main() {
assert(scanf("%d", &n) == 1);
p.resize(n);
for (int i = 0; i < n; i++) {
p[i].resize(n);
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
assert(scanf("%d", &p[i][j]) == 1);
}
}
int possible = construct(p);
check(possible == 0 || possible == 1, "Invalid return value of construct");
if (possible == 1) {
check(called, "construct returned 1 without calling build");
} else {
check(!called, "construct called build but returned 0");
}
printf("%d\n", possible);
if (possible == 1) {
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (j) {
printf(" ");
}
printf("%d", b[i][j]);
}
printf("\n");
}
}
}*/
