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String Problem Description There is a string S.S only contain lower case English character.(10≤length(S)≤1,000,000)How many substrings there are that 阅读全文
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D. Kefa and Dishes When Kefa came to the restaurant and sat at a table, the waiter immediately brought him the menu. There were n dishes. Kefa knows t 阅读全文
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2124: 等差子序列 Description 给一个1到N的排列{Ai}，询问是否存在1<=p1=3），使得Ap1,Ap2,Ap3,…ApLen是一个等差序列。 给一个1到N的排列{Ai}，询问是否存在1<=p1=3），使得Ap1,Ap2,Ap3,…ApLen是一个等差序列。 Input 输入的第 阅读全文
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E. Beautiful Subarrays One day, ZS the Coder wrote down an array of integers a with elements a1, a2, ..., an. A subarray of the array a is a sequence 阅读全文