logs for my leetcoding fall 2023
- set(listA) <= set(listB) can be used for list subset relationship. (e.g., Curriculum I, II)
- set() minus is useful in finding unique elements
- np.argsort (from the largest idx to the smallest idx)
x = np.array([3, 1, 2])
np.argsort(x)
# array([1, 2, 0])- str.index
import numpy as np
class Solution:
def strStr(self, haystack: str, needle: str) -> int:
if needle in haystack:
return haystack.index(needle)
else:
return -1- str.strip() method
string = ' xoxo love xoxo '
# Leading and trailing whitespaces are removed
print(string.strip())
# All <whitespace>,x,o,e characters in the left
# and right of string are removed
print(string.strip(' xoe'))
# Argument doesn't contain space
# No characters are removed.
print(string.strip('stx'))
string = 'android is awesome'
print(string.strip('an'))
# xoxo love xoxo
# lov
# xoxo love xoxo
# droid is awesome