This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "supertrees.h"
using namespace std;
int construct(vector<vector<int>> p) {
int n = p.size();
vector<int> dist = {0, 0, 0, 0};
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
dist[p[i][j]]++;
// subtask 1
if (dist[1] == n*n) {
vector<vector<int>> r(n, vector<int>(n));
for(int i=0;i<n;i++) {
r[i][(i+1)%n] = 1;
r[(i+1)%n][i] = 1;
}
build(r);
return 1;
}
return 0;
}
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