Dinic algorithm seems to have an unnecessary variable

Line 71 in 08ac6c1

std::vector<int> level(_n), iter(_n);

Why do you need the "iter" variable in maxflow.hpp? It seems it is only initialized to 0 and never changed.

Line 94 in 08ac6c1

for (int& i = iter[v]; i < int(g[v].size()); i++) {

We are using iter in this line