Submission #638582

#	Time	Username	Problem	Language	Result	Execution time	Memory
638582		morasha3	Alternating Heights (CCO22_day1problem1)	C++17	6 / 25	1090 ms	4276 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef   double ld;
#define endl '\n'
bool dfs(vector<vector<int>>& v)
{
    int n = v.size();
    vector<int> deg(n);
    for (int a = 0; a < n; a++)
        for (int b : v[a])
            deg[b]++;

    vector<int> q;
    q.reserve(n);
    for (int i = 0; i < n; i++)
        if (deg[i] == 0)
            q.push_back(i);
    for (int rep = 0; rep < q.size(); rep++)
    {
        int c = q[rep];
        for (auto nxt : v[c])
        {
            deg[nxt]--;
            if (deg[nxt] == 0)
                q.push_back(nxt);
        }
    }
    return n>q.size();
}


int32_t main()
{
    //freopen("jumping.in","r",stdin);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,k,q;
    cin>>n>>k>>q;
    int arr[n];
    for(int i=0; i<n; i++)
        {cin>>arr[i]; arr[i]--;}
        int m[n];
     for(int h:{0,1})
    {
        for(int i=h; i<n; i+=2)
        {
            int r=i+1,c=0;
            while(r<n)
            {
                vector<vector<int>>adj(k);
                for(int j=i; j<r; j++)
                {
                    if (j % 2 == i % 2)
                        adj[arr[j]].push_back(arr[j + 1]);
                    else
                        adj[arr[j + 1]].push_back(arr[j]);
                }

                if(dfs(adj))
                    break;
                r++;
            }
            m[i]=r-1;
        }
    }
      while(q--)
    {
        int 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 'bool dfs(std::vector<std::vector<int> >&)':
Main.cpp:18:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (int rep = 0; rep < q.size(); rep++)
      |                       ~~~~^~~~~~~~~~
Main.cpp:28:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     return n>q.size();
      |            ~^~~~~~~~~
Main.cpp: In function 'int32_t main()':
Main.cpp:48:23: warning: unused variable 'c' [-Wunused-variable]
   48 |             int r=i+1,c=0;
      |                       ^

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