How to declare/use an unordered_set for triplets (tuple) using custom comparator? I need to store triplets of float (handled as tuple) in a set to check for potential duplicates. As it’s about float, I guess using regular compare with == will not work so customizing compare is needed. This minimal code doesn’t compile: >> cat… Read More How to declare/use an `unordered_set` for triplets (`tuple`) using custom comparator?

I am implementing a class that involves unordered_sets, and unordered_maps. When I go to run the program it gives me the following error error: no match for ‘operator[]’ (operand types are ‘std::unordered_set<std::__cxx11::basic_string<char> >’ and ‘const string’ {aka ‘const std::__cxx11::basic_string<char>’}) int points = Prizes[Codes[code]]->points; I am unsure of how to fix this, please help. I have… Read More How do I fix this error message error: no match for ‘operator[]’

Suppose I have a type whose values I want to store in a std::unordered_set that looks like this: struct S { int key; // key is conceptually a part of S and S needs access to it. int data; bool operator==(S const& rhs) const { return key == rhs.key; } bool operator==(int key) const {… Read More Constness with std::unordered_set & transparent hash

I was solving Increasing Subsequences in LeetCode and it is giving error continuously. Tried in different IDEs with same test cases working every time. Even after brainstorming for an hour or two I was unable to find the error. Here is my C++ solution. class Solution { public: vector<vector<int>>ans; vector<vector<int>> findSubsequences(vector<int>& nums) { vector<int>prev; calc(nums,prev,0);… Read More Runtime Error. Addition of unsigned offset