TCR

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increasing_function should overwrite on insert

1

`std::insert` doesn't overwrite, while we need this to update an existing index to a better value. Just using `m[x]` works, but is much slower. https://github.com/TimonKnigge/TCR/blob/master/snippets/datastructures/increasing_function.cpp#L12

RagnarGrootKoerkamp

std::iota

1

What about changing ```c++ for(size_t i=0; i

RagnarGrootKoerkamp

Prime counting formula

1

And extensions, as e.g. used in https://projecteuler.net/problem=606

TimonKnigge