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total_min_distance = 100000.0 // some high value
while (node.ok())
{
  ... // calculate your current mindistance
  if (mindistance < total_min_distance)
    total_min_distance = mindistance;
}
std::cout << "Minimum distance in whole run: " << total_min_distance << std::endl;

This gives you the minimum distance of the time the node was running when the node is shutting down.

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