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13_Roman to Integer.java
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13_Roman to Integer.java
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/**
* @author WasitShafi
* @since 15-AUG-2021
*/
class Solution {
public int romanToInt(String s) {
int ans = 0;
int n = s.length();
for (int i = 0; i < n; i++) {
switch (s.charAt(i)) {
case 'I':
if (i + 1 < n && s.charAt(i+1) == 'V') {
ans += 4;
i++;
} else if (i + 1 < n && s.charAt(i+1) == 'X') {
ans += 9;
i++;
} else {
ans++;
}
break;
case 'V':
ans += 5;
break;
case 'X':
if (i + 1 < n && s.charAt(i+1) == 'L') {
ans += 40;
i++;
} else if (i + 1 < n && s.charAt(i+1) == 'C') {
ans += 90;
i++;
} else {
ans += 10;
}
break;
case 'L':
ans += 50;
break;
case 'C':
if (i + 1 < n && s.charAt(i+1) == 'D') {
ans += 400;
i++;
} else if (i + 1 < n && s.charAt(i+1) == 'M') {
ans += 900;
i++;
} else {
ans += 100;
}
break;
case 'D':
ans += 500;
break;
case 'M':
ans += 1000;
break;
}
}
return ans;
}
}