If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
ОАЭ задумались об атаке на Иран20:55
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“How do we make sure that these systems are really hardened? How do we make sure that they’re rigorously tested?”
uses almost all modern Fortran features: classes, inheritance, allocatable