The first call to Lambda Function by std::accumulate uses the initial value 0 as 'a' and the first element of the vector as 'b'.

for these ex : std::vector{-1, 2, 3, 4, -5};

first imple : a = 0, b = -1 ==> resul a + std::max(0, b) = 0 + 0 = 0; then store the result to a.

Second imple : a = 0, b = 2 ==> resul a + std::max(0, b) = 0 + 2 = 2; then store the result to a.
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I can't understand this solution

I can't understand this solution

how

this solution isn't suitable for programming,brother

it's really clever but indentation is not very good.

nice coding

fantastic man

ohh!!
As simple as the idea of the code, as imposible as to got to mind anyone.
great work man.

I liked your mind mood