package org.example;

import java.util.HashMap;

public class RomanToInt {

public int romanToInt(String s) {

HashMap<Character, Integer> hashMap = new HashMap<>();

hashMap.put('I', 1);

hashMap.put('V', 5);

hashMap.put('X', 10);

hashMap.put('L', 50);

hashMap.put('C', 100);

hashMap.put('D', 500);

hashMap.put('M', 1000);

int sum = 0;

for (int i = 0; i < s.length(); i++) {

Character curr = s.charAt(i);

if (i + 1 < s.length()) {

Character next = s.charAt(i + 1);

if (hashMap.get(curr) < hashMap.get(next)) {

sum -= hashMap.get(curr);

} else {

sum += hashMap.get(curr);

}

} else {

sum += hashMap.get(curr);

}

}

return sum;

}

}