Roman to Integer
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public class Solution { public int romanToInt(String s) { if (s == null || s.length() == 0) { return 0; } Map<Character, Integer> map = new HashMap<>(); map.put('I', 1); map.put('V', 5); map.put('X', 10); map.put('L', 50); map.put('C', 100); map.put('D', 500); map.put('M', 1000); int result = map.get(s.charAt(s.length() - 1)); for (int i = s.length() - 2; i >= 0; i--) { if (map.get(s.charAt(i)) >= map.get(s.charAt(i + 1))) { result = result + map.get(s.charAt(i)); } else { result = result - map.get(s.charAt(i)); } } return result; }} 0 0
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