Given an integer x
, return true
if x
is palindrome integer.
An integer is a palindrome when it reads the same backward as forward.
121
is a palindrome while 123
is not.Roman numerals are represented by seven different symbols: I
, V
, X
, L
, C
, D
and M
.
SymbolValue
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
For example, 2
is written as II
in Roman numeral, just two one's added together. 12
is written as XII
, which is simply X + II
. The number 27
is written as XXVII
, which is XX + V + II
.
Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII
. Instead, the number four is written as IV
. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX
. There are six instances where subtraction is used:
I
can be placed before V
(5) and X
(10) to make 4 and 9.X
can be placed before L
(50) and C
(100) to make 40 and 90.C
can be placed before D
(500) and M
(1000) to make 400 and 900.Given a roman numeral, convert it to an integer.
Exercise: https://leetcode.com/problems/roman-to-integer/
Resolution made by francisco veiras:
https://www.youtube.com/watch?v=TYP_6L67i3I&ab_channel=FranDev