Topic: Stack-question / Level: Advanced

• 461. Implement a function to find the number of pairs of elements in a stack that sum to a target value.
• 462. Write a function to check if a stack can be sorted using a single auxiliary stack.
• 463. Implement a function to find the longest balanced substring of parentheses.
• 464. Write a function to create a stack from an array.
• 465. Implement a function to evaluate a postfix expression with multiple operands.
• 466. Write a function to find the maximum area of a rectangle in a histogram using a stack.
• 467. Implement a function to calculate the product of all elements in a stack.
• 468. Write a function to check if a given stack can be sorted with another stack.
• 469. Implement a function to find the maximum depth of nested parentheses using a stack.
• 470. Write a function to generate all possible subsets of a given set using a stack.
• 471. Implement a function to find the longest common substring using a stack.
• 472. Write a function to check if a given stack is a palindrome.
• 473. Implement a function to perform a postorder traversal of a binary tree using a stack.
• 474. Write a function to evaluate a complex expression using a stack.
• 475. Implement a function to create a stack that supports range queries.
• 476. Write a function to find the maximum difference between any two elements in a stack.
• 477. Implement a function to check if a stack can be sorted using a single auxiliary stack.
• 478. Write a function to find the longest increasing subsequence of integers in a stack.
• 479. Implement a function to generate all possible permutations of a string using a stack.
• 480. Write a function to find the total number of valid configurations of a stack.
• 481. Implement a function to create a stack that supports conditional operations.
• 482. Write a function to find the longest substring of unique characters in a stack.
• 483. Implement a function to check if a stack can be sorted with limited operations.
• 484. Write a function to evaluate an expression in postfix notation with error handling.
• 485. Implement a function to create a stack of strings and sort it lexicographically.
• 486. Write a function to find the smallest element that appears more than once in a stack.
• 487. Implement a function to calculate the maximum depth of nested expressions using a stack.
• 488. Write a function to generate all unique permutations of a string using a stack.
• 489. Implement a function to find the smallest prime factor in a stack of integers.
• 490. Write a function to find the longest valid parentheses substring using a stack.

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