Dengeli bir ifade verildiğinde, yinelenen parantez içerip içermediğini bulun. Aynı alt ifade birden fazla parantez içine alınmışsa, bir parantez kümesi kopyalanır.
Örnekler:
smtp internet protokolü
Below expressions have duplicate parenthesis -
((a+b)+((c+d)))
The subexpression 'c+d' is surrounded by two
pairs of brackets.
(((a+(b)))+(c+d))
The subexpression 'a+(b)' is surrounded by two
pairs of brackets.
(((a+(b))+c+d))
The whole expression is surrounded by two
pairs of brackets.
((a+(b))+(c+d))
(b) and ((a+(b)) is surrounded by two
pairs of brackets but it will not be counted as duplicate.
Below expressions don't have any duplicate parenthesis -
((a+b)+(c+d))
No subexpression is surrounded by duplicate
brackets.
Verilen ifadenin geçerli olduğu ve herhangi bir boşluk bulunmadığı varsayılabilir.
Fikir yığın kullanmaktır. Verilen ifadeyi yineleyin ve ifadedeki her karakter için, karakter açık bir parantez ise '(' veya operatörlerden veya işlenenlerden herhangi biri onu yığının en üstüne iter. Karakter yakın parantez ise ')' ardından eşleşen açık parantez '(' bulunana kadar yığından karakterleri pop edin ve açılış parantezi '(' bulunana kadar karşılaşılan her karakter için değeri artan bir sayaç kullanılır. Açılış ve kapanış arasında karşılaşılan karakter sayısı ise Sayacın değerine eşit olan parantez çifti 1'den küçükse bir çift parantez bulunur, aksi halde fazladan parantez çifti oluşmaz. Örneğin (((a+b))+c), 'a+b' etrafında yinelenen parantezlere sahiptir. a+b'den sonraki ikinci ')' ile karşılaşıldığında yığın '((' içerir. Yığının tepesi bir açılış parantezi olduğundan, şu sonuca varılabilir: yinelenen parantez.
Aşağıda yukarıdaki fikrin uygulanması yer almaktadır:
sql'de durum nedirC++
// C++ program to find duplicate parenthesis in a // balanced expression #include using namespace std; // Function to find duplicate parenthesis in a // balanced expression bool findDuplicateparenthesis(string str) { // create a stack of characters stack<char> Stack; // Iterate through the given expression for (char ch : str) { // if current character is close parenthesis ')' if (ch == ')') { // pop character from the stack char top = Stack.top(); Stack.pop(); // stores the number of characters between a // closing and opening parenthesis // if this count is less than or equal to 1 // then the brackets are redundant else not int elementsInside = 0; while (top != '(') { elementsInside++; top = Stack.top(); Stack.pop(); } if(elementsInside < 1) { return 1; } } // push open parenthesis '(' operators and // operands to stack else Stack.push(ch); } // No duplicates found return false; } // Driver code int main() { // input balanced expression string str = '(((a+(b))+(c+d)))'; if (findDuplicateparenthesis(str)) cout << 'Duplicate Found '; else cout << 'No Duplicates Found '; return 0; }
Java import java.util.Stack; // Java program to find duplicate parenthesis in a // balanced expression public class GFG { // Function to find duplicate parenthesis in a // balanced expression static boolean findDuplicateparenthesis(String s) { // create a stack of characters Stack<Character> Stack = new Stack<>(); // Iterate through the given expression char[] str = s.toCharArray(); for (char ch : str) { // if current character is close parenthesis ')' if (ch == ')') { // pop character from the stack char top = Stack.peek(); Stack.pop(); // stores the number of characters between a // closing and opening parenthesis // if this count is less than or equal to 1 // then the brackets are redundant else not int elementsInside = 0; while (top != '(') { elementsInside++; top = Stack.peek(); Stack.pop(); } if (elementsInside < 1) { return true; } } // push open parenthesis '(' operators and // operands to stack else { Stack.push(ch); } } // No duplicates found return false; } // Driver code public static void main(String[] args) { // input balanced expression String str = '(((a+(b))+(c+d)))'; if (findDuplicateparenthesis(str)) { System.out.println('Duplicate Found '); } else { System.out.println('No Duplicates Found '); } } }
Python # Python3 program to find duplicate # parenthesis in a balanced expression # Function to find duplicate parenthesis # in a balanced expression def findDuplicateparenthesis(string): # create a stack of characters Stack = [] # Iterate through the given expression for ch in string: # if current character is # close parenthesis ')' if ch == ')': # pop character from the stack top = Stack.pop() # stores the number of characters between # a closing and opening parenthesis # if this count is less than or equal to 1 # then the brackets are redundant else not elementsInside = 0 while top != '(': elementsInside += 1 top = Stack.pop() if elementsInside < 1: return True # push open parenthesis '(' operators # and operands to stack else: Stack.append(ch) # No duplicates found return False # Driver Code if __name__ == '__main__': # input balanced expression string = '(((a+(b))+(c+d)))' if findDuplicateparenthesis(string) == True: print('Duplicate Found') else: print('No Duplicates Found') # This code is contributed by Rituraj Jain
C# // C# program to find duplicate parenthesis // in a balanced expression using System; using System.Collections.Generic; class GFG { // Function to find duplicate parenthesis // in a balanced expression static Boolean findDuplicateparenthesis(String s) { // create a stack of characters Stack<char> Stack = new Stack<char>(); // Iterate through the given expression char[] str = s.ToCharArray(); foreach (char ch in str) { // if current character is // close parenthesis ')' if (ch == ')') { // pop character from the stack char top = Stack.Peek(); Stack.Pop(); // stores the number of characters between // a closing and opening parenthesis // if this count is less than or equal to 1 // then the brackets are redundant else not int elementsInside = 0; while (top != '(') { elementsInside++; top = Stack.Peek(); Stack.Pop(); } if (elementsInside < 1) { return true; } } // push open parenthesis '(' // operators and operands to stack else { Stack.Push(ch); } } // No duplicates found return false; } // Driver code public static void Main(String[] args) { // input balanced expression String str = '(((a+(b))+(c+d)))'; if (findDuplicateparenthesis(str)) { Console.WriteLine('Duplicate Found '); } else { Console.WriteLine('No Duplicates Found '); } } } // This code is contributed by 29AjayKumar
JavaScript // JavaScript program to find duplicate parentheses in a balanced expression function findDuplicateParenthesis(s) { let stack = []; // Iterate through the given expression for (let ch of s) { // If current character is a closing parenthesis ')' if (ch === ')') { let top = stack.pop(); // Count the number of elements // inside the parentheses let elementsInside = 0; while (top !== '(') { elementsInside++; top = stack.pop(); } // If there's nothing or only one element // inside it's redundant if (elementsInside < 1) { return true; } } // Push open parenthesis '(' operators and operands to stack else { stack.push(ch); } } // No duplicates found return false; } // Driver code let str = '(((a+(b))+(c+d)))'; if (findDuplicateParenthesis(str)) { console.log('Duplicate Found'); } else { console.log('No Duplicates Found'); } // This code is contributed by rag2127
Çıkış
Duplicate Found
Çıkış:
Duplicate FoundZaman karmaşıklığı Yukarıdaki çözümün O(n) olduğu.
Yardımcı alan program tarafından kullanılan O(n)'dir.