BBC questions Marco Rubio over reported strike on Iranian school
Layer 1: Unfixing. During the initial constraint propagation, if a neighbor cell creates a contradiction, the solver converts it from a fixed constraint back into a solvable cell. Its own neighbors (two cells out — "anchors") become the new constraints. This is cheap and handles easy cases.
。新收录的资料对此有专业解读
В КСИР выступили с жестким обращением к США и Израилю22:46
Fortunately, being not-bad at this is enough.