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Copy pathQ13_RomanToInteger.java
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27 lines (25 loc) · 1.5 KB
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package leetcode;
public class Q13_RomanToInteger {
public static int romanToInt(String s) {
int ans = 0;
while (s.length()!=0){//1、continue的使用 2、equals 和 == 的区别
if ((s.length()>=2)&&(s.substring(0,2).equals("CM"))){ans += 900; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='M')) {ans += 1000;s = s.substring(1); continue;}
if ((s.length()>=2)&&(s.substring(0,2).equals("CD"))){ans += 400; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='D')) {ans += 500; s = s.substring(1); continue;}
if ((s.length()>=2)&&(s.substring(0,2).equals("XC"))){ans += 90; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='C')) {ans += 100; s = s.substring(1); continue;}
if ((s.length()>=2)&&(s.substring(0,2).equals("XL"))){ans += 40; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='L')) {ans += 50; s = s.substring(1); continue;}
if ((s.length()>=2)&&(s.substring(0,2).equals("IX"))){ans += 9; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='X')) {ans += 10; s = s.substring(1); continue;}
if ((s.length()>=2)&&(s.substring(0,2).equals("IV"))){ans += 4; s = s.substring(2); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='V')) {ans += 5; s = s.substring(1); continue;}
if ((s.length()>=1)&&(s.charAt(0)=='I')) {ans += 1; s = s.substring(1); continue;}
}
return ans;
}
public static void main(String[] args) {
System.out.println(romanToInt("MCMXCVI"));
}
}