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Problem Statement
Given a directory change command cd a/b/../c/d/e/../../ output the visit count of each directory such as: {a=2, b=1, c=2, d=2, e=1}.
Solution
package problems;
import java.util.HashMap;
import java.util.Map;
import java.util.Stack;
public class CountDirectory {
private static Map<String, Integer> count(String path) {
String[] dirs = path.split("/");
Stack<String> stack = new Stack<>();
Map<String, Integer> count = new HashMap<>();
for (String d:dirs) {
String dir = d;
if ("..".equals(dir)) {
stack.pop();
dir = stack.peek();
} else {
stack.add(dir);
if (!count.containsKey(dir)) {
count.put(dir, 0);
}
}
count.put(dir, count.get(dir) + 1);
}
return count;
}
public static void main(String[] args) {
String path = "a/b/../c/d/e/../../";
System.out.println(count(path));
}
}