小飞淙的云端

摘要： hello $(a+b)^2 = a^2 + 2ab + b^2$ $f_{i,j}=max\texttt{\{} f_{i 1,j}+a_i,f_{i 1,0} \texttt{\}}$ $f_{i} = min\texttt{\{} f_j + S_i S_j \texttt{\}}$ $\te 阅读全文