Givet en inputstreng og et mønster, skal du kontrollere, om tegnene i inputstrengen følger samme rækkefølge som bestemt af tegn, der er til stede i mønsteret. Antag, at der ikke vil være nogen duplikerede tegn i mønsteret.
Eksempler:
Input: string = 'engineers rock' pattern = 'er'; Output: true All 'e' in the input string are before all 'r'. Input: string = 'engineers rock' pattern = 'egr'; Output: false There are two 'e' after 'g' in the input string. Input: string = 'engineers rock' pattern = 'gsr'; Output: false There are one 'r' before 's' in the input string.
Vi har diskuteret to tilgange til at løse dette problem.
Tjek, om strengen følger rækkefølgen af tegn defineret af et mønster eller ej | Sæt 1
Tjek, om strengen følger rækkefølgen af tegn defineret af et mønster eller ej | Sæt 2
I denne tilgang tildeler vi først en etiket (eller rækkefølge) til tegn i mønster. Mærkerne tildeles i stigende rækkefølge.
For eksempel er mønsteret 'gsr' mærket som følgende
'g' => 1 's' => 2 'r' => 3
Det betyder, at 'g' kommer først, derefter 's' og derefter 'r'
Efter at have tildelt etiketter til mønstertegn, gentager vi strengtegn. Mens vi krydser, holder vi styr på etiket (eller rækkefølge) af sidst besøgte karakter. Hvis etiketten for det nuværende tegn er mindre end det foregående tegn, returnerer vi falsk. Ellers opdaterer vi sidste etiket. Hvis alle tegn følger rækkefølgen, returnerer vi true.
Nedenfor er implementeringen
C++// C++ program to find if a string follows order // defined by a given pattern. #include
// Java program to find if a string follows order // defined by a given pattern. class GFG { static int CHAR_SIZE = 256; // Returns true if characters of str follow // order defined by a given ptr. static boolean checkPattern(String str String pat) { int[] label = new int[CHAR_SIZE]; // Initialize all orders as -1 for (int i = 0; i < CHAR_SIZE; i++) label[i] = -1; // Assign an order to pattern characters // according to their appearance in pattern int order = 1; for (int i = 0; i < pat.length(); i++) { // give the pattern characters order label[pat.charAt(i)] = order; // increment the order order++; } // Now one by check if string characters // follow above order int last_order = -1; for (int i = 0; i < str.length(); i++) { if (label[str.charAt(i)] != -1) { // If order of this character is less // than order of previous return false. if (label[str.charAt(i)] < last_order) return false; // Update last_order for next iteration last_order = label[str.charAt(i)]; } } // return that str followed pat return true; } // Driver code public static void main(String[] args) { String str = 'engineers rock'; String pattern = 'gsr'; System.out.println(checkPattern(str pattern)); } } // This code is contributed by // sanjeev2552
# Python3 program to find if a string follows # order defined by a given pattern CHAR_SIZE = 256 # Returns true if characters of str follow # order defined by a given ptr. def checkPattern(Str pat): # Initialize all orders as -1 label = [-1] * CHAR_SIZE # Assign an order to pattern characters # according to their appearance in pattern order = 1 for i in range(len(pat)): # Give the pattern characters order label[ord(pat[i])] = order # Increment the order order += 1 # Now one by one check if string # characters follow above order last_order = -1 for i in range(len(Str)): if (label[ord(Str[i])] != -1): # If order of this character is less # than order of previous return false if (label[ord(Str[i])] < last_order): return False # Update last_order for next iteration last_order = label[ord(Str[i])] # return that str followed pat return True # Driver Code if __name__ == '__main__': Str = 'engineers rock' pattern = 'gsr' print(checkPattern(Str pattern)) # This code is contributed by himanshu77
// C# program to find if a string follows order // defined by a given pattern. using System; class GFG { static int CHAR_SIZE = 256; // Returns true if characters of str follow // order defined by a given ptr. static bool checkPattern(String str String pat) { int[] label = new int[CHAR_SIZE]; // Initialize all orders as -1 for (int i = 0; i < CHAR_SIZE; i++) label[i] = -1; // Assign an order to pattern characters // according to their appearance in pattern int order = 1; for (int i = 0; i < pat.Length; i++) { // give the pattern characters order label[pat[i]] = order; // increment the order order++; } // Now one by check if string characters // follow above order int last_order = -1; for (int i = 0; i < str.Length; i++) { if (label[str[i]] != -1) { // If order of this character is less // than order of previous return false. if (label[str[i]] < last_order) return false; // Update last_order for next iteration last_order = label[str[i]]; } } // return that str followed pat return true; } // Driver code public static void Main(String[] args) { String str = 'engineers rock'; String pattern = 'gsr'; Console.WriteLine(checkPattern(str pattern)); } } // This code is contributed by 29AjayKumar
<script> // Javascript program to find if a string follows order // defined by a given pattern. let CHAR_SIZE = 256; // Returns true if characters of str follow // order defined by a given ptr. function checkPattern(strpat) { let label = new Array(CHAR_SIZE); // Initialize all orders as -1 for (let i = 0; i < CHAR_SIZE; i++) label[i] = -1; // Assign an order to pattern characters // according to their appearance in pattern let order = 1; for (let i = 0; i < pat.length; i++) { // give the pattern characters order label[pat[i].charCodeAt(0)] = order; // increment the order order++; } // Now one by check if string characters // follow above order let last_order = -1; for (let i = 0; i < str.length; i++) { if (label[str[i].charCodeAt(0)] != -1) { // If order of this character is less // than order of previous return false. if (label[str[i].charCodeAt(0)] < last_order) return false; // Update last_order for next iteration last_order = label[str[i].charCodeAt(0)]; } } // return that str followed pat return true; } // Driver code let str = 'engineers rock'; let pattern = 'gsr'; document.write(checkPattern(str pattern)); // This code is contributed by rag2127 </script>
Produktion
false
Tidskompleksitet af dette program er På) med konstant ekstra plads (arrayetiketten har konstant størrelse 256).
Hjælpeplads: O(256).