void
ContestDijkstra::UpdateTrace(bool force)
{
if (append_serial == trace_master.GetAppendSerial())
/* unmodified */
return;
if (IsMasterUpdated()) {
UpdateTraceFull();
trace_dirty = true;
finished = false;
first_finish_candidate = incremental ? n_points - 1 : 0;
} else if (finished) {
const unsigned old_size = n_points;
if (UpdateTraceTail())
/* new data from the master trace, start incremental solver */
AddIncrementalEdges(old_size);
} else if (force) {
if (UpdateTraceTail()) {
/* new data from the master trace, restart the non-incremental
solver */
trace_dirty = true;
first_finish_candidate = incremental ? n_points - 1 : 0;
}
}
}
void
OLCTriangle::UpdateTrace(bool force)
{
if (IsMasterAppended()) return; /* unmodified */
if (force || IsMasterUpdated(false)) {
UpdateTraceFull();
is_complete = false;
best_d = 0;
closing_pairs.Clear();
is_closed = FindClosingPairs(0);
} else if (is_complete && incremental) {
const unsigned old_size = n_points;
if (UpdateTraceTail()) {
is_complete = false;
is_closed = FindClosingPairs(old_size);
}
}
/**
* Update tick_iterations to a sensible value. Statistical analysis
* revealed that the branch and bound algorithm worst running time
* is around O(n_points^2.2), it's best can be better than O(n_points).
* Using n_points^2 / 8 as number of iterations per tick should allow
* the algorithm to finish in about 10 to 15 ticks in most cases.
*/
tick_iterations = n_points * n_points / 8;
}
