Given a string str, the task is to find the bracket numbers, i.e., for each bracket in str, return i if the bracket is the ith opening or closing bracket to appear in the string.
Question
Given a string str, the task is to find the bracket numbers, i.e., for each bracket in str, return i if the bracket is the ith opening or closing bracket to appear in the string.
Solution
Here is a Python solution for the problem:
def find_bracket_numbers(s):
# Initialize the open_bracket list and counter
open_bracket = []
counter = 1
# Initialize the result list with the same length as the input string
result = [0]*len(s)
# Iterate over the string
for i in range(len(s)):
# If the character is an opening bracket
if s[i] == '(':
# Append the counter to the open_bracket list
open_bracket.append(counter)
# Set the corresponding element in the result list to the counter
result[i] = counter
# Increment the counter
counter += 1
# If the character is a closing bracket
elif s[i] == ')':
# Set the corresponding element in the result list to the last element in the open_bracket list
result[i] = open_bracket[-1]
# Remove the last element from the open_bracket list
open_bracket.pop()
# Return the result list
return result
This function works by maintaining a list of the numbers of the opening brackets that have not yet been closed. When it encounters an opening bracket, it increments the counter and adds the new number to the list and the result. When it encounters a closing bracket, it adds the number of the most recent unclosed opening bracket to the result and removes that number from the list.
Similar Questions
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.An input string is valid if:Open brackets must be closed by the same type of brackets.Open brackets must be closed in the correct order.Every close bracket has a corresponding open bracket of the same type.
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You are given a string s that consists of lower case English letters and brackets.Reverse the strings in each pair of matching parentheses, starting from the innermost one.Your result should not contain any brackets.
Write a program to check if string contain only Numbers
Single File Programming QuestionProblem StatementEmilia, a passionate computer science explorer, is on a journey to master string manipulation. She has devised a unique pattern decoding system and needs your help to implement it. Your task is to write a program that takes a string as input and decodes it according to the following rules:If a digit 'n' is encountered, it means that the substring enclosed in square brackets '[' and ']' should be repeated 'n' times.If a pair of square brackets is encountered without a preceding digit, the enclosed substring should be repeated once.ExampleInput: 3[Hello]2[World]Output:HelloHelloHelloWorldWorldExplanation: In this example, the substring "Hello" is repeated three times, and "World" is repeated two times as indicated by the digits preceding the square brackets.Input format :The input is a single line string (k) containing alphanumeric characters, square brackets ('[' and ']'), and digits ('0'-'9').Output format :The output displays a single line string representing the decoded version of the input string.Refer to the sample output for the formatting specifications.Code constraints :In the given scenario, the test cases fall under the following constraints:3 ≤ k ≤ 15Sample test cases :Input 1 :3[Hello]2[World]Output 1 :HelloHelloHelloWorldWorldInput 2 :3[b2[ca]]Output 2 :bcacabcacabcacaInput 3 :3[a3[b]1[ab]]Output 3 :abbbababbbababbbabInput 4 :3[b]Output 4 :bbbNote :The program will be evaluated only after the “Submit Code” is clicked.Extra spaces and new line characters in the program output will result in the failure of the test case.
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