15 Jun 2024•Easy•C++ / Python / TypeScript

Roman to Integer

C++, Python and TypeScript solutions for Roman to Integer.

The Roman to Integer solutions are below.

Solution files

Python•roman-to-integer/synced-solution.py

class Solution:
    def romanToInt(self, s: str) -> int:
        vals = {'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}
        res = 0
        for i in range(len(s)):
            if i+1 < len(s) and vals[s[i]] < vals[s[i+1]]:
                res -= vals[s[i]]
            else:
                res += vals[s[i]]
        return res

C++•roman-to-integer/synced-solution.cpp

class Solution {
public:
    int romanToInt(string s) {
        unordered_map<char,int> vals={{'I',1},{'V',5},{'X',10},{'L',50},{'C',100},{'D',500},{'M',1000}};
        int res = 0;
        for (int i = 0; i < s.size(); i++) {
            if (i+1 < s.size() && vals[s[i]] < vals[s[i+1]]) res -= vals[s[i]];
            else res += vals[s[i]];
        }
        return res;
    }
};

TypeScript•roman-to-integer/synced-solution.ts

function romanToInt(s: string): number {
    const vals: {[k:string]:number} = {I:1,V:5,X:10,L:50,C:100,D:500,M:1000};
    let res = 0;
    for (let i = 0; i < s.length; i++) {
        if (i+1 < s.length && vals[s[i]] < vals[s[i+1]]) res -= vals[s[i]];
        else res += vals[s[i]];
    }
    return res;
}