并查集
P3367 【模板】并查集https://www.luogu.com.cn/problem/P3367
P1111 修复公路https://www.luogu.com.cn/problem/P1111
P1551 亲戚https://www.luogu.com.cn/problem/P1551
P2024 [NOI2001] 食物链https://www.luogu.com.cn/problem/P2024
树状数组
3374 【模板】树状数组 1 https://www.luogu.com.cn/problem/P3374
P3368 【模板】树状数组 2 https://www.luogu.com.cn/problem/P3368
P1908 逆序对https://www.luogu.com.cn/problem/P1908
P3655 不成熟的梦想家 (未熟 DREAMER)https://www.luogu.com.cn/problem/P3655