【LeetCode】13Roman to Integer
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Given a roman numeral, convert it to an integer.
Input is guaranteed to be within the range from 1 to 3999.
public class Solution { public int romanToInt(String s) { char[] arrs = s.toCharArray(); Integer sum = 0; for(int i = 0; i < arrs.length; i++){ switch (arrs[i]){ case 'I': if(i < arrs.length - 1){ if(arrs[i+1] == 'V'){ sum += 4; i++; }else if(arrs[i+1] == 'X'){ sum += 9; i++; }else{ sum += 1; } }else{ sum += 1; } break; case 'V': sum += 5; break; case 'X': if(i < arrs.length - 1){ if(arrs[i+1] == 'L'){ sum += 40; i++; }else if(arrs[i+1] == 'C'){ sum += 90; i++; }else{ sum += 10; } }else{ sum += 10; } break; case 'L': sum += 50; break; case 'C': if(i < arrs.length - 1){ if(arrs[i+1] == 'D'){ sum += 400; i++; }else if(arrs[i+1] == 'M'){ sum += 900; i++; }else{ sum += 100; } }else{ sum += 100; } break; case 'D': sum += 500; break; case 'M': sum += 1000; break; } } return sum; }} 0 0
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