Submission #858353

#	Time	Username	Problem	Language	Result	Execution time	Memory
858353		jamkel	Teoretičar (COCI18_teoreticar)	C++14	0 / 130	838 ms	28604 KiB

teoreticar

#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
typedef long long ll;
bool dfs(vector<vector<pair<int,bool>>>&a,vector<vector<pair<int,bool>>>&b, vector<bool>&odwiedzone,bool czy,int co)
{
    int f=0;
    if(czy)
    {
        f+=a.size();
    }
    if(odwiedzone[co+f])
    {
        return false;
    }
    odwiedzone[co+f]=true;
    if(czy)
    {
        for(int i=0;i<b[co].size();i++)
        {
            if(b[co][i].nd==true)
            {
                if(dfs(a,b,odwiedzone,false,b[co][i].st))
                {
                    b[co][i].nd=false;                    
                    for(int o=0;o<a[b[co][i].st].size();o++)
                    {
                        if(a[b[co][i].st][o].st==co)
                        {
                            a[b[co][i].st][o].nd=false;
                            break;
                        }
                    }
                    return true;
                }
                return false;
            }
        }
        return true;

    }
    else
    {
        for(int i=0;i<a[co].size();i++)
        {
            if(a[co][i].nd==false)
            {
                if(dfs(a,b,odwiedzone,true,a[co][i].st))
                {
                    a[co][i].nd=true;
                    for(int o=0;o<b[a[co][i].st].size();o++)
                    {
                        if(b[a[co][i].st][o].st==co)
                        {
                            b[a[co][i].st][o].nd=true;
                            break;
                        }
                    }
                    return true;
                }
            }
        
        }return false;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int l,r,m;
    cin>>l>>r>>m;

    vector<vector<pair<int,bool>>>a(l);
    vector<bool>w(l);
    vector<vector<pair<int,bool>>>b(r);
    vector<int>q(l);
    srand((unsigned) time(NULL));
    for(int i=0;i<l;i++)
    {
        q[i]=i;
    }
    random_shuffle(q.begin(),q.end());
    for(int i=0;i<m;i++)
    {
        int x,y;
        cin>>x>>y;
        a[x].push_back({y,false});
        b[y].push_back({x,false});

    }
    bool ok=true;
    int ile=0;
    while(ok)
    {
        ok=false;
        vector<bool>odwiedzone(l+r);
        for(int i=0;i<l;i++)
        {
            if(!w[q[i]])
            {
                if(dfs(a,b,odwiedzone,false,q[i]))
                {
                    ok=true;
                    ile++;
                    w[q[i]]=true;
                }
            }
        }
    }
    cout<<ile<<endl;
    for(int i=0;i<l;i++)
    {
        for(int o=0;o<a[i].size();o++)
        {
            if(a[i][o].nd==true)
            {
                cout<<i<<" "<<a[i][o].st<<endl;
            }
        }
    }
}

Compilation message (stderr)

teoreticar.cpp: In function 'bool dfs(std::vector<std::vector<std::pair<int, bool> > >&, std::vector<std::vector<std::pair<int, bool> > >&, std::vector<bool>&, bool, int)':
teoreticar.cpp:20:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for(int i=0;i<b[co].size();i++)
      |                     ~^~~~~~~~~~~~~
teoreticar.cpp:27:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |                     for(int o=0;o<a[b[co][i].st].size();o++)
      |                                 ~^~~~~~~~~~~~~~~~~~~~~~
teoreticar.cpp:45:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for(int i=0;i<a[co].size();i++)
      |                     ~^~~~~~~~~~~~~
teoreticar.cpp:52:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |                     for(int o=0;o<b[a[co][i].st].size();o++)
      |                                 ~^~~~~~~~~~~~~~~~~~~~~~
teoreticar.cpp: In function 'int main()':
teoreticar.cpp:113:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |         for(int o=0;o<a[i].size();o++)
      |                     ~^~~~~~~~~~~~

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