58. Length of Last Word

简单得不得简单 不说了

class Solution {public:    int lengthOfLastWord(string s) {        int n = s.length();        if(n == 0)        return 0;        int i;        int sum = 0;        for(i = n - 1; s[i] == ' ' && i >= 0; -- i);        for(;s[i] != ' ' && i >= 0; -- i)            sum++;        return sum;    }};