COIN-OR::LEMON - Graph Library

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  • lemon/bellman_ford.h

    r833 r835  
    2424/// \brief Bellman-Ford algorithm.
    2525
     26#include <lemon/list_graph.h>
    2627#include <lemon/bits/path_dump.h>
    2728#include <lemon/core.h>
     
    776777    /// length if the algorithm has already found one.
    777778    /// Otherwise it gives back an empty path.
    778     lemon::Path<Digraph> negativeCycle() {
     779    lemon::Path<Digraph> negativeCycle() const {
    779780      typename Digraph::template NodeMap<int> state(*_gr, -1);
    780781      lemon::Path<Digraph> cycle;
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