#include "supertrees.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
struct DSU
{
/* data */
int n;
vector<int> par, sz;
void init(int _n)
{
n = _n;
par.resize(n + 1, -1);
sz.resize(n + 1, 0);
}
int finds(int a)
{
if (par[a] == -1)
return a;
return par[a] = finds(par[a]);
}
void unites(int a, int b)
{
int x = finds(a);
int y = finds(b);
if (x != y)
{
if (sz[x] < sz[y])
swap(x, y);
par[y] = x;
sz[x] += sz[y];
}
}
};
int construct(std::vector<std::vector<int>> p)
{
int n = p.size();
DSU d;
d.init(n);
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
if (i == j)
continue;
if (p[i][j] == 3)
return 0;
if (p[i][j])
{
d.unites(i, j);
}
}
}
map<int, vector<int>> mp;
for (int i = 0; i < n; i++)
{
mp[d.finds(i)].push_back(i);
for (int j = 0; j < n; j++)
{
if (i == j)
continue;
if (p[i][j] == 0)
if (d.finds(i) == d.finds(j))
return 0;
}
}
vector<vector<int>> ans(n, vector<int>(n, 0));
for (auto a : mp)
{
int st = -1;
if (a.second.size() == 1)
continue;
int csz = a.second.size();
vector<int> vis(csz, 0), cyc;
for (int i = 0; i < csz; i++)
{
int st = -1;
int ii = a.second[i];
if (vis[ii])
continue;
cyc.push_back(ii);
vis[ii] = 1;
st = ii;
for (int j = 0; j < csz; j++)
{
if (vis[j])
continue;
if (p[ii][j] == 1)
ans[st][j] = 1, ans[j][st] = 1, st = j;
}
}
if(cyc.size() == 2)
return 0;
int st = cyc[0];
for(int i=1;i<(int)cyc.size();i++)
{
ans[st][cyc[i]] = 1;
ans[cyc[i]][st] = 1;
st = cyc[i];
}
}
build(ans);
return 1;
}
Compilation message
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:95:7: error: redeclaration of 'int st'
95 | int st = cyc[0];
| ^~
supertrees.cpp:70:7: note: 'int st' previously declared here
70 | int st = -1;
| ^~
