Leetcode 1002. Find Common Characters

文章作者：Tyan
博客：noahsnail.com  |  CSDN  | 

1. Description

Find Common Characters

2. Solution

• Version 1

class Solution:
    def commonChars(self, A):
        n = len(A)
        if n == 1:
            return []
        result = sorted(A[0])
        for i in range(1, n):
            result = common(result, A[i])
        return result


def common(A, B):
    result = []
    B = sorted(B)
    m = len(A)
    n = len(B)
    i = 0
    j = 0
    while i < m and j < n:
        if A[i] < B[j]:
            i += 1
        elif A[i] > B[j]:
            j += 1
        else:
            result.append(A[i])
            i += 1
            j += 1
    return result

• Version 2

class Solution:
    def commonChars(self, A):
        n = len(A)
        if n == 1:
            return []
        result = list(A[0])
        B = [list(A[i]) for i in range(1, n)]
        for ch in A[0]:
            for i in range(n - 1):
                if ch not in B[i]:
                    result.remove(ch)
                    break
                B[i].remove(ch)
        return result

Reference

1. https://leetcode.com/problems/find-common-characters/