【LeetCode】Reverse Words in a String
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题目:
Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue
",
return "blue is sky the
".
解答:
首先理解题意很重要,不然会浪费很多时间在细节上,先理清题目隐藏的一些细节:1,字符串的两端的空格要去掉;2,单词间只保留一个空格,如以下测试用例:
" " "a " " a " " a" " a b " " a b " " a b" "a b " " a b c d e f g "
代码如下:class Q151_ReverseWords{//acpublic static String reverseWords(String s){if(s=="") return "";String str="";int start=0,end;for(int i=s.length()-1;i>=0;){while(i>=0&&s.charAt(i)==' ') i--;if(i!=start) str+=" ";end=i;while(i>=0&&s.charAt(i)!=' ') i--;start=i;str+=s.substring(start+1,end+1);}//去除两端空格start=0;end=str.length()-1;while(start<=end&&str.charAt(start)==' ')start++;while(start<=end&&str.charAt(end)==' ')end--;return str.substring(start,end+1);}public static void main(String[] args){String str=" a b ";System.out.print(str);System.out.println("--");System.out.print(reverseWords(str));System.out.println("--");}}
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