Length of Last Word
Leetcode algorithms problem 58: Length of Last Word
问题描述
Given a string s consists of upper/lower-case alphabets and empty space characters ’ ‘, return the length of last word in the string.
If the last word does not exist, return 0.问题提示
A word is defined as a character sequence consists of non-space characters only.
思路
1.一开始拿空字符来判断每个最后单词的长度,采取两个空格之间的长度作为输出,后面发现输入的字符串可以连续空字符,此法作罢
2.遍历字符串,如果不是空字符,temp变量++,否则变为0,当temp长度不为0时,将值赋给sum
代码
class Solution {
public:
int lengthOfLastWord(string s) {
int sum=0;
int temp=0;
for(int i = 0; i < s.length(); i++){
if(s[i] != ' '){
temp++;
}else{
temp = 0;
}
if(temp != 0){
sum = temp;
}
}
return sum;
}
};
};
时间复杂度: O(n)
空间复杂度: O(1)