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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static boolean matches(String pattern, String str) {
  11.         // base case 1: we came to end in both string and pattern -> matched
  12.         if (str.length() == 0 && pattern.length() == 0) {
  13.             return true;
  14.         }
  15.         // base case 2: we came to end in string, but pattern contains more symbols (and it is not '*')
  16.         if (str.length() == 0 && !pattern.equals("*")) {
  17.             return false;
  18.         }
  19.         // checking the next symbol matching
  20.         if (charsMatch(pattern, '?') || charsMatch(pattern, str)) {
  21.             return matches(pattern.substring(1), str.substring(1));
  22.         }
  23.         // checking wildcard - there are two scenarios: either we skip the wildcard, or we skip the next symbol
  24.         if (charsMatch(pattern, '*')) {
  25.             return matches(pattern.substring(1), str) || matches(pattern, str.substring(1));
  26.         }
  27.         return false;
  28.     }
  29.  
  30.     private static boolean charsMatch(String s, char ch) {
  31.         return s.length() > 0 && s.charAt(0) == ch;
  32.     }
  33.     private static boolean charsMatch(String s, String p) {
  34.         return s.length() > 0 && p.length() > 0 && s.charAt(0) == p.charAt(0);
  35.     }
  36.  
  37.     public static void main(String[] args) {
  38.         eq("g*ks", "geeks"); // Yes
  39.         eq("ge?ks*", "geeksforgeeks"); // Yes
  40.         neq("g*k", "gee");  // No because 'k' is not in second
  41.         neq("*pqrs", "pqrst"); // No because 't' is not in first
  42.         eq("abc*bcd", "abcdhghgbcd"); // Yes
  43.         neq("abc*c?d", "abcd"); // No because second must have 2 instances of 'c'
  44.         eq("*c*d", "abcd"); // Yes
  45.         eq("*?c*d", "abcd"); // Yes
  46.     }
  47.  
  48.     private static void eq(String s, String s2) {
  49.         assert matches(s, s2);
  50.     }
  51.     private static void neq(String s, String s2) {
  52.         assert !matches(s, s2);
  53.     }
  54. }
Success #stdin #stdout 0.09s 320320KB
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https://ideone.com/PYDm0E
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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