Submission #638587

#	Time	Username	Problem	Language	Result	Execution time	Memory
638587		morasha3	Alternating Heights (CCO22_day1problem1)	C++17	0 / 25	179 ms	3356 KiB

Main

    #include <bits/stdc++.h>
    using namespace std;
    typedef int ll;
    typedef   double ld;
    const ll mod=1e9+7;
    #define endl '\n'
    ll n,k,q,arr[3007],vis[3007],s[3007];
    vector<vector<ll>>v(3007);
    bool f=0;
    void dfs(ll idx)
    {
        vis[idx]=1;
        s[idx]=1;
        for(int i=0; i<v[idx].size(); i++)
        {
            if(vis[v[idx][i]]&&s[v[idx][i]])
            {
                f=1;
                break;
            }
            else if(vis[v[idx][i]])
                continue;
            dfs(v[idx][i]);
        }
        s[idx]=0;
    }


    int32_t main()
    {
        //freopen("jumping.in","r",stdin);
        ios_base::sync_with_stdio(0);
        cin.tie(0);
        cout.tie(0);

        cin>>n>>k>>q;
        for(int i=0; i<n; i++)
            cin>>arr[i];
        ll m[n];
        for(int h=0;h<2;h++)
        {
            for(int i=h,r=i+1,c=0;i<n;i+=2)
            {
                while(r<n)
                {
                    if(c==0)
                    {
                        c++;
                        v[arr[r]-1].push_back(arr[r-1]-1);
                    }
                    else
                    {
                        c=0;
                        v[arr[r-1]-1].push_back(arr[r]-1);
                    }
                    for(int j=0;j<k;j++)vis[j]=0;
                    f=0;
                    for(int j=0;j<k;j++)
                    {
                        if(vis[j]==0)
                            dfs(j);
                    }
                    if(f)break;
                    r++;
                }
                m[i]=r-1;
                for(int j=0;j<k;j++)v[j].clear();
            }
        }
        while(q--)
        {
            ll a,b;
            cin>>a>>b;
            a--,b--;
            if(m[a]>=b)
                cout<<"YES"<<endl;
            else
                cout<<"NO"<<endl;
        }

        return 0;

    }

Compilation message (stderr)

Main.cpp: In function 'void dfs(ll)':
Main.cpp:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         for(int i=0; i<v[idx].size(); i++)
      |                      ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 8