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backtracking

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An array is squareful if the sum of every pair of adjacent elements is a perfect square. Given an integer array nums, return the number of permutations of nums that are squareful. Two permutations perm1 and perm2 are different if there is some index i such that perm1[i] != perm2[i].

  • Updated Nov 1, 2025
  • C

This is a promising implementation of the n-Queens problem in C. It uses a recursive backtracking algorithm to find all solutions to the n-Queens problem. It is a promising implementation because it uses a heuristic to prune the search tree. The heuristic is to only place a queen in a column if it is not in check with any other queens.

  • Updated Dec 10, 2022
  • C

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