usaco 1.3.1 Greedy Algorithm
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textbook
Notes
- The basic idea behind greedy algorithms is to build large solutions up from smaller ones.
- Unlike other approaches, however, greedy algorithms keep only the best solution they find as they go along.
- Greedy algorithms are fast, generally linear to quadratic and require little extra memory.
- at each step, there is always an optimal answer which is a superset of the current state.
- If the greedy algorithm finds the correct answer, go for it, but don’t get suckered into thinking the greedy solution will work for all problems.
- 例题:有限种数的排序:桶排
- 例题:图论搜索 入度为0放最后,递归出度
最少覆盖
一次没考虑 线段端点
一次没考虑 最多木板<最多母牛
部分背包
看错最大范围WA一次
线性算法:
最大值已知,扫一遍过去
(另外发现双拼打字其实挺慢的,滚回全拼= =)
0 0
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