Submission #924433

#	Time	Username	Problem	Language	Result	Execution time	Memory
924433		Muhammad_Aneeq	Political Development (BOI17_politicaldevelopment)	C++17	27 / 100	3018 ms	5972 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]={};
int ans=0;
bool valid(vector<int>f)
{
    for (auto i:f)
        res[i]=0;
    for (auto i:f)
    {
        for (auto j:nei[i])
            res[j]++;
    }
    bool w=0;
    for (auto i:f)
    {
        if (res[i]!=f.size()-1)
        {
            w=1;
            break;
        }
    }
    return (!w);
}
vector<int>f;
int n,k;
void check(int j,int n)
{
    if (f.size()==k-1)
    {
        f.push_back(n);
        if (valid(f))
            ans=max(ans,int(f.size()));
        f.pop_back();
        return;
    }
    if (j==nei[n].size())
    {
        f.push_back(n);
        if (valid(f))
            ans=max(ans,int(f.size()));
        f.pop_back();
        return;
    }
    check(j+1,n);
    f.push_back(nei[n][j]);
    check(j+1,n);
    f.pop_back();
}
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++)
        check(0,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 'bool valid(std::vector<int>)':
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)
      |             ~~~~~~^~~~~~~~~~~~
politicaldevelopment.cpp: In function 'void check(int, int)':
politicaldevelopment.cpp:39:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   39 |     if (f.size()==k-1)
      |         ~~~~~~~~^~~~~
politicaldevelopment.cpp:47:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     if (j==nei[n].size())
      |         ~^~~~~~~~~~~~~~~

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