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take the 2-d array and parse it completely and store all the characters in an unordered multimap, say if a occurs at row 2 and row 5 then store {a,2}, {a,5} in the map. Now start from first row, 'check' all the rows that have common characters with this row and then proceed to the next 'unchecked' row and do the same. O(n^2) space and O(n^2) time
- sassy1 February 21, 2014