## Find if an Array of Strings can be Chained to form a Circle in JavaFind whether an array of strings may be linked together to create a circle. If the last character of string X and the first character of string Y are the same, then string X can be positioned in a circle before string Y.
String a = {"python", "nodejs", "scripted-php"}
Yes, the strings can be chained to form a circle.
For the given array of strings, the strings that can be formed as chains are python ? nodejs; nodejs ? scripted-php; scripted-php ? python. Hence, the strings can be chained to form a circle.
String a = {"bac", "cda", "aaa", "aab"}
Yes, the strings can be chained to form a circle.
For the given array of strings, the strings that can be formed as chains are bac ? cda; cda ? aaa; aaa ? aab; aab ? bac. Hence, the strings can be chained to form a circle.
String a = {"ijk", "kji", "abc", "cba"}
No, the strings cannot be chained to form a circle.
For the given array of strings, the strings that can be formed as chains are ijk ? kji; abc ? cba, but they cannot be formed as a cycle. Hence, the strings cannot be chained to form a circle. ## Approach: Using Directed GraphsThe approach implements into practice an algorithm to determine if a directed graph can form an Eulerian cycle. It accomplishes this by verifying two conditions:
The technique iterates over the graph using depth-first search (DFS), verifying that all vertices have been visited. In order to verify the connection in both directions, the graph is also constructed in reverse. In the final step, it makes use of the graph structure to determine if the given collection of strings may be chained together to form an Eulerian cycle.
## Implementation:
Yes, it can be chained
The time complexity of the above code is O(N), and the space complexity is O(N). |

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