#include "supertrees.h"
#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x) cerr<< #x <<" = "<< x<<endl;
using namespace std;
typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int vis[MAXN];
int construct(std::vector<std::vector<int>> p) {
int n = p.size();
std::vector<std::vector<int>> answer;
for (int i = 0; i < n; i++) {
std::vector<int> row;
row.resize(n);
answer.push_back(row);
}int mx=0;
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
if(i!=j)
umax(mx,p[i][j]);
if(mx==3)
return 0;
if(mx==0){
build(answer);
return 1;
}
vector<int>a,b; int cnt=0;
for(int i=0;i<n;i++)
if(!vis[i]){
a.clear();b.clear();
vis[i]=++cnt;a.pb(i);b.pb(i);
for(int j=i+1;j<n;j++)
if(!vis[j] and p[i][j]){
if(p[i][j]==2)
a.pb(j);
else
b.pb(j),answer[i][j]=answer[j][i]=1;
vis[j]=cnt;
}
for(int j=0;j<int(a.size());j++)
for(int k=j+1;k<int(a.size());k++)
if(p[a[j]][a[k]]!=2)
return 0;
for(int j=0;j<int(b.size());j++)
for(int k=j+1;k<int(b.size());k++)
if(p[b[j]][b[k]]!=1)
return 0;
for(int j=1;j<int(a.size());j++)
for(int k=1;k<int(b.size());k++)
if(p[a[j]][b[k]]!=2)
return 0;
if(int(a.size())==1)
continue;
if(int(a.size())==2)
return 0;
for(int j=0;j<int(a.size());j++)
answer[a[j]][a[(j+1)%int(a.size())]]=answer[a[(j+1)%int(a.size())]][a[j]]=1;
}
build(answer);
return 1;
}
