Submission #924444

#	Time	Username	Problem	Language	Result	Execution time	Memory
924444		Muhammad_Aneeq	Political Development (BOI17_politicaldevelopment)	C++17	39 / 100	3053 ms	6228 KiB

politicaldevelopment

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/

#include <iostream>
#include <vector>
#include <set>
using namespace std;
int const N=6e4+10;
vector<int>nei[N]={};
int res[N]={};
bool vis[N]={};
vector<int>f;
int n,k,ans=0;;
void dfs(int n)
{
    if (f.size()==k)
        return;
    vis[n]=1;
    f.push_back(n);
    for (auto j:nei[n])
        res[j]++;
    for (auto i:f)
    {
        if (res[i]!=f.size()-1)
        {
            for (auto j:nei[n])
                res[j]--;
            f.pop_back();
            vis[n]=0;
            return;
        }
    }
    for (auto j:nei[n])
    {
        if (!vis[j])
            dfs(j);
    }
    ans=max(ans,int(f.size()));
    for (auto j:nei[n])
        res[j]--;
    f.pop_back();
    vis[n]=0;
}
inline void solve()
{
    cin>>n>>k;
    for (int i=0;i<n;i++)
    {
        int d;
        cin>>d;
        while (d--)
        {
            int x;
            cin>>x;
            if (i!=x)
                nei[i].push_back(x);
        }
    }
    for (int i=1;i<=n;i++)
    {
        for (int j=1;j<=n;j++)
            vis[i]=0;
        dfs(i);
    }
    cout<<min(ans,k)<<endl;
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'void dfs(int)':
politicaldevelopment.cpp:19:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   19 |     if (f.size()==k)
      |         ~~~~~~~~^~~
politicaldevelopment.cpp:27:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         if (res[i]!=f.size()-1)
      |             ~~~~~~^~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23