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0bach0/Roman2Integer.java

Last active February 16, 2020 15:52
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Revisions

  1. 0bach0 revised this gist Feb 16, 2020. No changes.
  2. 0bach0 created this gist Feb 16, 2020.
    45 changes: 45 additions & 0 deletions Roman2Integer.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,45 @@
    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;
    }
    }