Pairwise union of sets

CodeChefRating 1771Open on judge ↗

There are N sets of integers from 1 to K both inclusive. Find out number of pairs of sets whose union contains all the K elements. Input The first line contains an integer T denotes number of test cases. The first line of each test case contains two space separated integers N, K. The each of the next line first contains an integer leni denoting number of elements in the i-th set, followed by l

HINT LADDERno hints yet

L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

🔒

L5 Full solution

L5 unlocks only if you insist twice

solution.cppC++17

CodeSearch Tutor

Hints, not spoilers — it won’t hand over the full solution unless you insist.

voice by Sarvam AI