Prepare > Python > Collections > Word Order

Word Order | HackerRank

 

문제

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You are given n words. Some words may repeat. For each word, output its number of occurrences. The output order should correspond with the input order of appearance of the word. See the sample input/output for clarification.

Input Format

The first line contains the integer, n.
The next n lines each contain a word.

 

Output Format

Output 2 lines.
On the first line, output the number of distinct words from the input.
On the second line, output the number of occurrences for each distinct word according to their appearance in the input.

 

 

 

 

코드

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from collections import defaultdict

d = defaultdict(int)
N = int(input())

for i in range(N):
    d[input()] += 1

 
print(len(d.keys()))
print(*d.values())

 

 

 

 

노트

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defaultdict

defaultdict(int)를 주면 키 값을 넘겨줄 때, 0을 자동으로 설정해주는듯?

from collections import defaultdict

d = defaultdict(int)
N = int(input())

for i in range(N):
    print(d)
    d[input()] += 1
    print(d)

defaultdict(<class 'int'>, {})
defaultdict(<class 'int'>, {'bcdef': 1})
defaultdict(<class 'int'>, {'bcdef': 1})
defaultdict(<class 'int'>, {'bcdef': 1, 'abcdefg': 1})
defaultdict(<class 'int'>, {'bcdef': 1, 'abcdefg': 1})
defaultdict(<class 'int'>, {'bcdef': 1, 'abcdefg': 1, 'bcde': 1})
defaultdict(<class 'int'>, {'bcdef': 1, 'abcdefg': 1, 'bcde': 1})
defaultdict(<class 'int'>, {'bcdef': 2, 'abcdefg': 1, 'bcde': 1})

 

 

 

 

참조

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Prepare > Python > Collections > DefaultDict Tutorial