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Q2:Reverse Words in a String
Clarification:
- What constitutes a word?
A sequence of non-space characters constitutes a word. - Could the input string contain leading or trailing spaces?
Yes. However, your reversed string should not contain leading or trailing spaces. - How about multiple spaces between two words?
Reduce them to a single space in the reversed string.
MyAnswer 1 (Java):
1 public class Solution { 2 public String reverseWords(String s) { 3 String result = ""; 4 int i = 0; 5 int j = s.length(); 6 for(i = s.length()-1; i >= 0; i--) 7 { 8 if(s.charAt(i) == ‘ ‘) 9 {10 if(i == s.length()-1)11 {12 j = i;13 //continue;14 }15 else if(i == 0)16 {17 //i++;18 break;19 }20 else if(j == i+1)21 {22 j = i;23 //continue;24 }25 else26 {27 result = result.concat(s.substring(i+1,j)+" ");28 j = i;29 }30 }31 }32 result = result.concat(s.substring(i+1,j));33 if(!result.isEmpty() && result.charAt(result.length()-1) == ‘ ‘)34 result = result.substring(0,result.length()-1);35 return result;36 }37 }
使代码更加精简，改为：
MyAnswer 2(Java):
1 public class Solution { 2 public String reverseWords(String s) { 3 4 String result = ""; 5 int j = s.length(); 6 int i = j-1; 7 8 for(; i >= 0; i--) 9 {10 if(s.charAt(i) == ‘ ‘)11 {12 if(i == 0)13 {14 break;15 }16 else if(i != s.length()-1 && j != i+1)17 {18 result = result.concat(s.substring(i+1,j)+" ");19 }20 j = i;21 }22 }23 24 result = result.concat(s.substring(i+1,j));25 26 int k = result.length();27 if(!result.isEmpty() && result.charAt(k-1) == ‘ ‘)28 result = result.substring(0,k-1);29 return result;30 }31 }
Q2:Reverse Words in a String
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