using a boolean array

Check whether (row, column) is a valid spot. Return True if (row, column) is inside the bounds of the grid and has not been marked a

Check whether (row, column) is a valid square for a new queen. Returns False in case there already is a queen placed on the same row,

TEST CODE

Function to make the entire row or column as 0 if any row or col val is 0

Merges array @param a first array @param b second array @param lastA number of "real" elements in a @param lastB number of "real" elements in b

Determine if str_ has all unique characters

Now without using additional data structures

if n = 2, find the 2nd element from the last node

* The algorithm is for single linked lists and can be used for doubly linkedlist too */ * Recursive helper function for the algorithm */

Return a generator of all the combinations of n-pairs of parentheses.

* Given two strings, decide if one is a permutation of the other */

Return a generator of all the permutations of the string.

Place a queen on square (row, column).

Function to compress the string [potential]