How should I practice Merge Subsequences Into a Consistent Total Order?

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Merge Subsequences Into a Consistent Total Order

Google● MediumINTERNFULLTIMEONSITE INTERVIEW

Problem statement

You are given several integer subsequences. Every adjacent pair in a subsequence imposes a directed ordering constraint. Merge all distinct values into one total sequence that respects every constraint.

The problem statement continues

Pro

Examples

Example 1

subsequences = [[1,2,3],[1,3],[2,4]]return = [1,2,3,4]

The order respects every edge and chooses 3 before 4 when both are available.

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