利用兩個指針在陣列或字串上移動，透過不同起點、方向或速度來高效解決問題。常見模式包括：相向指針（由兩端往中間）、同向指針（快慢指針）。
Notes:
- 通常需要先排序，或在已排序的資料上操作
- 相向指針常用於尋找配對，快慢指針常用於偵測環或找中點
跨倉庫導讀#
- 對應理論章節：線性資料結構 ↗
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