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| package jp.vietpro.vta; | |
| class Solution { | |
| public static int romanToInt(String s) { | |
| int value = 0; | |
| char prevValue = '0'; | |
| for (int i = 0; i < s.length(); i++) { | |
| if(i > 0) | |
| prevValue = s.charAt(i-1); | |
| switch (s.charAt(i)) { | |
| case 'V': | |
| value+=5; | |
| if(prevValue == 'I') value-=2; | |
| break; | |
| case 'X': | |
| value+=10; | |
| if(prevValue == 'I') value-=2; | |
| break; | |
| case 'L': | |
| value+=50; | |
| if(prevValue == 'X') value-=20; | |
| break; | |
| case 'C': | |
| value+=100; | |
| if(prevValue == 'X') value-=20; | |
| break; | |
| case 'D': | |
| value+=500; | |
| if(prevValue == 'C') value-=200; | |
| break; | |
| case 'M': | |
| value+=1000; | |
| if(prevValue == 'C') value-=200; | |
| break; | |
| case 'I': value+=1; | |
| } | |
| } | |
| return value; | |
| } | |
| } |
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