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Update SimplifyPath.java #5

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124 changes: 76 additions & 48 deletions StacksAndQueues/SimplifyPath.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"
Note that absolute path always begin with �/� ( root directory )
Note that absolute path always begin with ‘/’ ( root directory )
Path will not have whitespace characters.

http://www.programcreek.com/2014/04/leetcode-simplify-path-java/
Expand All @@ -31,12 +31,12 @@ public class SimplifyPath{
// return result;
// }

public static String simplifyPath(String a) {
Stack<String> stack = new Stack<String>();
// public static String simplifyPath(String a) {
// Stack<String> stack = new Stack<String>();

//remove all ending "/"
while(a.length() > 0 && a.charAt(a.length() - 1) == '/')
a = a.substring(0, a.length()-1);
// while(a.length() > 0 && a.charAt(a.length() - 1) == '/')
// a = a.substring(0, a.length()-1);

/*suppose path = "/a/./b/../../c/"
* push /a
Expand All @@ -48,60 +48,88 @@ public static String simplifyPath(String a) {
*
*
*/
int start = 0;
for(int i = 1; i < a.length(); i++){
if(a.charAt(i) == '/'){
System.out.println("when c = / \n" + a.substring(start, i));
stack.push(a.substring(start, i));
start = i;
}
else if(i == a.length()-1){
System.out.println("When i = a.length()-1 \n"+a.substring(start));
stack.push(a.substring(start));
}
}
// int start = 0;
// for(int i = 1; i < a.length(); i++){
// if(a.charAt(i) == '/'){
// System.out.println("when c = / \n" + a.substring(start, i));
// stack.push(a.substring(start, i));
// start = i;
// }
// else if(i == a.length()-1){
// System.out.println("When i = a.length()-1 \n"+a.substring(start));
// stack.push(a.substring(start));
// }
// }


//take the result in linkedlist
LinkedList<String> result = new LinkedList<String>();
int back = 0;
while(!stack.isEmpty()){
String top = stack.pop();
System.out.println("top = " + top);
if(top.equals("/.") || top.equals("/")){
// LinkedList<String> result = new LinkedList<String>();
// int back = 0;
// while(!stack.isEmpty()){
// String top = stack.pop();
// System.out.println("top = " + top);
// if(top.equals("/.") || top.equals("/")){
//nothing
}
else if(top.equals("/.."))
back++;
else {
if(back > 0)
back--;
else
result.push(top);
// }
// else if(top.equals("/.."))
// back++;
// else {
// if(back > 0)
// back--;
// else
// result.push(top);

}
// }

}
System.out.println("result :" );
for(String s : result)
System.out.print(s + " ");
System.out.println();
if(result.isEmpty())
return "/";
StringBuilder sb = new StringBuilder();
while(!result.isEmpty()){
String s = result.pop();
sb.append(s);
// }
// System.out.println("result :" );
// for(String s : result)
// System.out.print(s + " ");
// System.out.println();
// if(result.isEmpty())
// return "/";
// StringBuilder sb = new StringBuilder();
// while(!result.isEmpty()){
// String s = result.pop();
// sb.append(s);
//System.out.println(sb.toString());
}
return sb.toString();
// }
// return sb.toString();



}

// }


public String simplifyPath(String path) {

if (path == null || path.charAt(0) != '/')
return null;

String[] parts = path.split("/");

Stack stk = new Stack();

for (String part : parts) {
if (part.equals("..") && !stk.isEmpty())
stk.pop();
else if (!part.equals(".") && !part.equals("..") && !part.isEmpty())
stk.push(part);

}

// print new path
if (stk.isEmpty()) return "/";
StringBuilder sbuild = new StringBuilder();
while (!stk.isEmpty()) {
sbuild.insert(0, "/" + stk.pop());
}
return sbuild.toString();
}


public static void main(String[] args){
String a = "/a/./b/../../c/";
String i = simplifyPath(a);
}
}
}