OpenSiv3D
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DisjointSet のメモリ消費削減
参考: https://zenn.dev/reputeless/books/standard-cpp-for-competitive-programming/viewer/union-find#1.4-%E9%AB%98%E9%80%9F%E5%8C%96-%2B-%E7%9C%81%E3%83%A1%E3%83%A2%E3%83%AA%E5%8C%96