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71 lines (69 loc) · 2.18 KB
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package javaU;
public class Solution {
public int romanToInt(String s) {
int sum = 0;
for (int i = 0; i < s.length(); i++) {
switch (s.charAt(i)) {
case 'I':
if(i != s.length() - 1) {
if (s.charAt(i + 1) == 'V') {
sum += 4;
i++;
break;
} else if (s.charAt(i + 1) == 'X') {
sum += 9;
i++;
break;
}
}
sum += 1;
break;
case 'V':
sum += 5;
break;
case 'X':
if(i != s.length() - 1) {
if (s.charAt(i + 1) == 'L') {
sum += 40;
i++;
break;
} else if (s.charAt(i + 1) == 'C') {
sum += 90;
i++;
break;
}
}
sum += 10;
break;
case 'L':
sum += 50;
break;
case 'C':
if(i != s.length() - 1) {
if (s.charAt(i + 1) == 'D') {
sum += 400;
i++;
break;
} else if (s.charAt(i + 1) == 'M') {
sum += 900;
i++;
break;
}
}
sum += 100;
break;
case 'D':
sum += 500;
break;
case 'M':
sum += 1000;
break;
}
}
return sum;
}
public static void main(String[] args) {
Solution s1 = new Solution();
System.out.println(s1.romanToInt("MCMXCIV"));
}
}