Why is the outer a unordered_map and not a vector? It's consecutive?
unordered_map
vector
vector<vector<int>> can also be used. But I think it is a bit easier to understand the mapping this way
vector<vector<int>>
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Why is the outer a
unordered_mapand not avector?It's consecutive?
vector<vector<int>>can also be used. But I think it is a bit easier to understand the mapping this way