Submission #1093963

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093963		simona1230	Joker (BOI20_joker)	C++17	14 / 100	2057 ms	18776 KiB

Joker

#include <bits/stdc++.h>

using namespace std;
int n,m,k;
pair<int,int> e[200001],q[200001];

void read()
{
    cin>>n>>m>>k;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        cin>>x>>y;
        e[i]={x,y};
    }

    for(int i=1;i<=k;i++)
    {
        int l,r;
        cin>>l>>r;
        q[i]={l,r};
    }
}

int used[200001];
vector<int> v[200001];
bool pos;

void dfs(int i)
{
    for(int j=0;j<v[i].size();j++)
    {
        int nb=v[i][j];
        if(!used[nb])
        {
            used[nb]=1;
            if(used[i]==1)used[nb]=2;

            dfs(nb);
        }
        else if(used[i]==used[nb])pos=0;
    }
}

void slow()
{
    for(int i=1;i<=k;i++)
    {
        pos=1;
        for(int j=1;j<=n;j++)
        {
            used[j]=0;
            v[j].clear();
        }

        for(int j=1;j<q[i].first;j++)
        {
            v[e[j].first].push_back(e[j].second);
            v[e[j].second].push_back(e[j].first);
        }

        for(int j=q[i].second+1;j<=m;j++)
        {
            v[e[j].first].push_back(e[j].second);
            v[e[j].second].push_back(e[j].first);
        }

        for(int j=1;j<=n;j++)
        {
            if(!used[j])
            {
                used[j]=1;
                dfs(j);
            }
        }

        if(pos)cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
    }
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	read();
	slow();
	return 0;
}

Compilation message (stderr)

Joker.cpp: In function 'void dfs(int)':
Joker.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int j=0;j<v[i].size();j++)
      |                 ~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 8 / 8
• Subtask 3: 0 / 25
• Subtask 4: 0 / 10
• Subtask 5: 0 / 22
• Subtask 6: 0 / 29