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# bdfu_2024_summer
# 题目经验总结
## Day2
### [U111091 区间2段覆盖](./day2/U111091/U111091.pdf)
### [U111091 区间2段覆盖](./day2/U111091/U111091.md)
1. 不要以小单位的路段为前缀和最小单位，要以房屋为前缀和最小单位\
## Day3
### [U86432 捞鱼(fish)](./day3/U86432/U86432.md)
1. 数据离散化是指把数据只保留有用的东西，在本题当中指的是把数据排序后保存顺序关系，让内存数组可以少一些
# 排序
## 稳定性
>隔着老远swap一般不稳定