HackerRank memo

It is a personal memo

Basic language

python3

・ Raw_input () Keyboard input (python2) input () for python3

n = input() n = int(input())

・ .Strip () Remove whitespace characters (spaces, tabs, newlines)

input().strip()

・ Sprit () Makes an array separated by the specified characters. If not specified in (), separate with a space or TAB

input().split()

・ STDIN Keyboard entered value Standard input

・ Difference Difference difference of the two numbers (first - second).

・ Product multiplication product of the two numbers.

・ ʻA // b` division. Returns the quotient as an integer Truncate after the decimal point

・ For statement for variable in sequence

n = int(raw_input())

for i in range(n):
   print(i*i)

・｀ Lange ｀ i<n from i = 0 n is not included.

range(3) = [0,1,2]

・ Leap Day leap year We add a Leap Day on February 29.

・ Intercalary day The day it was plugged in The leap day is an extra, or intercalary day.

・ Evenly divided by ~ Divisible by The year can be evenly divided by 4, is a leap year.

・ ʻIf statement` Required ":" after if, elif, else.

・ Sum (array) Calculate the total value

list = range(5)
print(sum(list))

・ Str () Convert to string

n = int(input())

a=""
for i in range(n):
   a =a+str(i+1)
print(a)

#output
a=12345~

・ Arithmetic operations Arithmetic operator. +-*%

・ Runner-up second place you are required to find the runner-up score.

・ (Lambda variable: processing) (argument) Lambda function You can create a function in one line (equivalent to def) (lambda variable: processing) (argument) └ Assign arguments to processing └ Multiple arguments are possible. Enter a variable in the ranking process.

print((lambda a,b,c:a*100+b*10+c*1)(1,2,3))

#output
123

・ Map (function, array) map function Execute a function for each element of the array. The output is a map object → Convert to list object with list (map ())

-Convert an array to an integer using the map function map = (int, array)

arr = map(int, input().split())

・ X ** y Exponentiation. x to the yth power

100 = 0 103 = 1000

・ Set () Remove duplicate values from array set type

arr=[2,3,6,6]
print(set(arr))

{2,3,6}

・ Sorted () Arrange the array in ascending order

Extract the nth largest value sorted()[-n]

#Extract the second largest value
arr=[2,3,6,6,5]

sorted(set(arr))[-2]

#output
5

・ Order their names alphabetically Arrange in alphabetical order order their names alphabetically and print each one on a new line.