Error Man 的博客

Maximum Sum You are given a grid consisting ofnrows each of which is dived intoncolumns. The rows are numbered from 1 tonfrom top to bottom, and the columns are numbered from 1 tonfrom left t...

H. Subsequences (hard version) The only difference between the easy and the hard versions is constraints. A subsequence is a string that can be derived from another string by deleting some or no sym...