Harry Potter and The Gridland City

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This is probably the darkest time in the wizarding world as YOU-KNOW-WHO is back and our beloved headmaster is dead. Death eaters have taken over the ministry and YOU-KNOW-WHO wants Harry at any cost. Our Harry along with Ron and Hermione is hiding from death eaters and they don't want to stay long at one place.So, they take out the map of gridland city whose size is N X M . All the addresses

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solution.cppC++17

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