leetcode/Problem13.java at master · actor168/leetcode · GitHub

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classProblem13 {
publicstaticvoidmain(String[] args) {
Strings = "MCMXCIV";
intlen = newProblem13().romanToInt(s);
System.out.println(len);
 }

publicintromanToInt(Strings) {
intsum = 0;
intpre = -1;
intcur = 0;
for (inti = 0; i < s.length(); i++) {
charc = s.charAt(i);
switch (c) {
case'I': cur = 1; break;
case'V': cur = 5; break;
case'X': cur = 10; break;
case'L': cur = 50; break;
case'C': cur = 100; break;
case'D': cur = 500; break;
case'M': cur = 1000; break;
 }

if (pre > 0 && pre < cur) {
sum = sum - 2 * pre + cur;
 } else {
sum += cur;
 }
pre = cur;
 }
returnsum;
 }
}