We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. Prepare
  2. Python
  3. Collections
  4. DefaultDict Tutorial
  5. Discussions

DefaultDict Tutorial

Sort by

recency

|

1126 Discussions

|

  • cdhanush057
     + 0 comments

    if u want u can create a defaultdict which creates an empty list for all the values it get's from group a and append the indeces of those values or u create ur own dictionary append the indeces of the list a and check with list b and print the indeces of each element.

    d={}
for i in range(1,n+1):
    w=input()
    if w not in d:
        d[w]=[]
    d[w].append(str(i))

for _ in range(m):
    y=input()
    if y in d:
        print(' '.join(d[y]))
    else:
        print(-1)

  • jakub_szymanski1
     + 0 comments
    from collections import defaultdict

n, m = map(int, input().split())
group_a = defaultdict(list)

for i in range(n):
    group_a[input()].append(i+1)

for i in range(m):
    word = input()
    if word in group_a.keys():
        print(*group_a[word], ' ')
    else:
        print('-1')

  • 24981a051l
     + 0 comments

    from collections import defaultdict

    n, m = map(int, input().split())

    groupA = defaultdict(list) for i in range(1, n + 1): word = input().strip() groupA[word].append(i)

    groupB = [input().strip() for _ in range(m)]

    for word in groupB: if word in groupA: print(*groupA[word]) else: print(-1)

  • cenkmyetis1
     + 0 comments

    from collections import defaultdict

    if name == 'main':
    N = list(map(int, input().split())) d = defaultdict(list) for i in range(N[0]): letter = input() d[letter].append(int(i+1)) #print(d)

    for i in range(N[1]):
    letter = input()
    if letter in d.keys():
        print(*d[letter])
    else:
        print(-1)

    purchase_order(arr, sizes)

  • dlhorowitz
     + 0 comments

    This code passes half the test cases but fails the other half. Any ideas on why?

    # # Enter your code here. Read input from STDIN. Print output to STDOUT
from collections import defaultdict
A, B = input().split()
listA = []
listB = []
for i in range(int(A)):
    item = input()
    listA.append(item)
for i in range(int(B)):
    item = input()
    listB.append(item)
b_in_a = defaultdict(list)
for i in range(len(listB)):
    if listB[i] not in listA:
        b_in_a[listB[i]] = -1
    else:
        for j in range(len(listA)):
            if listB[i] == listA[j]:
                b_in_a[listA[j]].append(j+1)
for key, value in b_in_a.items():
    print(*value)  # The * operator unpacks the list and separates elements by spaces