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A sequence of N positive integers (10 < N < 100 000), each of them less than or equal 10000, and a positive integer S (S < 100 000 000) are given. Write a program to find the minimal length o...

原题链接 Jessica’s a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she wants to pass it, she has to master all ideas...

原题链接 NanoApe, the Retired Dog, has returned back to prepare for for the National Higher Education Entrance Examination! In math class, NanoApe picked up sequences once again. He wrote down a sequence ...

原题链接 There is a string S.S only contain lower case English character.(10≤length(S)≤1,000,000) How many substrings there are that contain at least k(1≤k≤26) distinct characters? Input There are multipl...