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In this post, you will find the solution for the Roman to Integer in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.
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Link for the Problem – Roman to Integer– LeetCode Problem
Roman to Integer – LeetCode Problem
Problem:
Roman numerals are represented by seven different symbols: I
, V
, X
, L
, C
, D
and M
.
Symbol Value 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 beforeV
(5) andX
(10) to make 4 and 9.X
can be placed beforeL
(50) andC
(100) to make 40 and 90.C
can be placed beforeD
(500) andM
(1000) to make 400 and 900.
Given a roman numeral, convert it to an integer.
Example 1:
Input: s = "III" Output: 3 Explanation: III = 3.
Example 2:
Input: s = "LVIII" Output: 58 Explanation: L = 50, V= 5, III = 3.
Example 3:
Input: s = "MCMXCIV" Output: 1994 Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
Constraints:
1 <= s.length <= 15
s
contains only the characters('I', 'V', 'X', 'L', 'C', 'D', 'M')
.- It is guaranteed that
s
is a valid roman numeral in the range[1, 3999]
.
Roman to Integer– LeetCode Solutions
class Solution { public: int romanToInt(string s) { int ans = 0; vector<int> roman(128); roman['I'] = 1; roman['V'] = 5; roman['X'] = 10; roman['L'] = 50; roman['C'] = 100; roman['D'] = 500; roman['M'] = 1000; for (int i = 0; i + 1 < s.length(); ++i) if (roman[s[i]] < roman[s[i + 1]]) ans -= roman[s[i]]; else ans += roman[s[i]]; return ans + roman[s.back()]; } };
class Solution { public int romanToInt(String s) { int ans = 0; int[] roman = new int[128]; roman['I'] = 1; roman['V'] = 5; roman['X'] = 10; roman['L'] = 50; roman['C'] = 100; roman['D'] = 500; roman['M'] = 1000; for (int i = 0; i + 1 < s.length(); ++i) if (roman[s.charAt(i)] < roman[s.charAt(i + 1)]) ans -= roman[s.charAt(i)]; else ans += roman[s.charAt(i)]; return ans + roman[s.charAt(s.length() - 1)]; } }
class Solution: def romanToInt(self, s: str) -> int: ans = 0 roman = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000} for a, b in zip(s, s[1:]): if roman[a] < roman[b]: ans -= roman[a] else: ans += roman[a] return ans + roman[s[-1]]
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