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Obviously, we can store 4 kind of lines consists of x or o signs. This is horizontal, vertical, and two diagonal kind of lines. For each line, store coordinates of its ends. Also, maintain hash table to map coordinates to collection of lines ending in particular point.
- AlexanderYakovlevWork December 11, 2014When putting particular symbol to some point, extract up to 8 lines ending at that point and update set of lines on the map in O(1) time.
Checks for winner in O(1) time.