res[realIdx] = stack.length ? stack.at(-1) : -1;
Answer (Playground):
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In his Matching Soulmates paper in the journal of Public Economic Theory, everyone is in a computer simulated dating pool, where thousands of digitally created daters rank each other. His algorithm picks "first‑order soulmates": pairs who choose each other in a stable matching. It removes them, and runs it again with those left, and you get second‑order soulmates, and so on.
圖像加註文字，谷愛凌和粉絲「荒謬的觀點」與「令人失望的決定」