Submission #1216505

#	Time	Username	Problem	Language	Result	Execution time	Memory
1216505		LeonidCuk	Connecting Supertrees (IOI20_supertrees)	C++20	Compilation error	0 ms	0 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
vector<bool>vis;
void dfs(int i,vector<vector<int>>&p,vector<vector<int>>&res)
{
    int n=p.size();
    vis[j]=true;
    for(int j=0;j<n;j++)
    {
        if(i==j)continue;
        if(p[i][j]==1&&vis[j]==0)
        {
            res[i][j]=1;
            dfs(j,p,res);
        }
    }
    vector<int>ok;
    ok.push_back(i);
    for(int j=0;j<n;j++)
    {
        if(i==j)continue;
        if(p[i][j]==2&&vis[j]==0)
        {
            res[i][j]=1;
            vis[j]=1;
            ok.push_back(j);
        }
    }
    ok.push_back(i);
    if(ok.size()==2)return;
    for(int j=1;j<ok.size();j++)
    {
        res[ok[j]][ok[j-1]]=1;
    }
}
int construct(vector<vector<int>> p)
{
    int n=p.size();
    vis.resize(n);
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
            if(p[i][j]==3)return 0;
        }
    }
    vector<vector<int>>res(n,vector<int>(0));
    for(int i=0;i<n;i++)
    {
        if(vis[i]==0)dfs(i,p,res);
    }
    build(res);
    return 1;

}

Compilation message (stderr)

supertrees.cpp: In function 'void dfs(int, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&)':
supertrees.cpp:8:9: error: 'j' was not declared in this scope
    8 |     vis[j]=true;
      |         ^