Print adjacency list

Problem Statement - link #

Given the adjacency list of a bidirectional graph. Your task is to copy/clone the adjacency list for each vertex and return a new list.

Your Task: You dont need to read input or print anything. Your task is to complete the function printGraph() which takes the integer V denoting the number of vertices and adjacency list as input parameters and returns the list of list contains the node itself with its connected nodes(as same as it is given in input adjacency list).The returned list is a copy/clone of the actual list.

Expected Time Complexity: O(V+E)
Expected Auxiliary Space: O(V+E)

Examples #

Example 1:

Input:

Output: 
0-> 1-> 4 
1-> 0-> 2-> 3-> 4 
2-> 1-> 3 
3-> 1-> 2-> 4 
4-> 0-> 1-> 3
Explanation:
As 0,1 and 3 is connected to 4 so 4th row
of the list containing 4 and its connected
nodes 0,1 and 3 and we have to add those in
sorted order and same for every row.

Example 2:

Input:

Output: 
0-> 2-> 3 
1-> 2 
2-> 0-> 1 
3-> 0
Explanation:
As 2 and 3 is connected to 0 so 0th row
of the list containing 0 and its connected 
nodes 2 and 3 and we have to add those in
sorted order and same for every row. 

Constraints #

• 1 ≤ V, E ≤ 10^4

Solutions #

class Solution {
  public:
    // Function to return the adjacency list for each vertex.
    vector<vector<int>> printGraph(int V, vector<int> adj[]) {
        // Code here
        vector<vector<int>> v(V);
        for(int i=0;i<V;i++){
            v[i].push_back(i);
            v[i].insert(v[i].end(),adj[i].begin(),adj[i].end());
        }
        return v;
    }
};