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Python | Check whether two lists follow same pattern or not

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  • Last Updated : 17 Sep, 2019

Given two lists A and B, check if they follow the same pattern or not.
Condition for pattern matching:

  1. Ai > Aj, then Bi > Bj
  2. Ai = Aj, then Bi = Bj
  3. Ai < Aj, then Bi < Bj,
    for all i, j.

Example:

Input:
2 17 100
10 20 50

Output:
YES

Input:
5 7 10 33
10 50 10 45

Output:
NO

Approach:
To check if two lists follow the above pattern. Sort both lists and find the index of previous list element in the sorted list. If indices match, then pattern matched otherwise no pattern matched.

Code : Python program for checking the pattern.




# python program for above approach
a = [5, 7, 10, 33]
b = [10, 50, 10, 45]
aa = a.copy()
bb = b.copy()
  
# sorting the list
aa.sort()
bb.sort()
  
for i in range(len(a)-1):
      
    # checking the index are same or not
    if aa[i] < aa[i + 1] and bb[i] < bb[i + 1]:
        if a.index(aa[i])== b.index(bb[i]) and a.index(aa[i + 1]) == b.index(bb[i + 1]):
            flag ="YES"
        else:
            flag ="NO"
            break
      
    elif aa[i] == aa[i + 1] and bb[i] == bb[i + 1]:
        if a.index(aa[i]) == b.index(bb[i]) and a.index(aa[i + 1]) == b.index(bb[i + 1]):
            flag = "YES"
        else:
            flag = "NO"    
            break
      
    else:
        flag = "NO"
        break
      
print(flag)

Output :

NO

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