leetcood学习笔记-13
错误记录
class Solution: def romanToInt(self, s: str) -> int: d = {'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000} r=0 for i in range(len(s)): if d[s[i]]<d[s[i+1]] and i<len(s)-1: r-=d[s(i)] else: r+=d[s(i)] return r
会报错:TypeError: 'str' object is not callable
s(i)应改为s[i]
且第7行and的前后应为:
if i<len(s)-1 and d[s[i]]<d[s[i+1]] :**先判断前面的,若将d[s[i]]<d[s[i+1]]写在前面,会索引越界