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alley
An alley or alleyway is a narrow lane, path, or passageway, often reserved for pedestrians [步行者], which usually runs between, behind, or within buildings in the older parts of towns and cities. It is also a rear access or service road (back lane), or a paCF573E Bear and Bowling
XXVII.CF573E Bear and Bowling 考虑暴力的DP。设 \(f_{i,j}\) 表示前 \(i\) 个元素中选择长度为 \(j\) 的子序列所能得到的最大收益。 考虑由 \(f_i\) 转移到 \(f_{i+1}\)。明显，一共有两种转移方式：\(f_{i,j}\rightarrow f_{i+1,j}\)，或 \(f_{i,j}+(j+1)a_{i+1}\rightarrow f_{i+1,Cow Bowling
The cows don't use actual bowling balls when they go bowling. They each take a number (in the range 0..99), though, and line up in a standard bowling-pin-like triangle like this: 7 3 8 8 1 0 2 7 4 4 4 5 2CF573E Bear and Bowling（6-1）
题意 洛谷 做法一 考虑一种贪心（先别管对不对），设当前已选择的集合为\(A\)，这是考虑该集合的补集，每个元素加进来后的增量为\(V_i\)，则挑选最大的那个加入该集合 结论1：遵循上述贪心，\(\forall i,j(i<j)\)，满足\(a_i>a_j\)，倘若选\(j\)，集合中必定包含\(i\) 归纳： \(i,j\)间没有任何元素在\(A