摘要： C. Alyona and mex Problem Description： Alyona's mother wants to present an array of n non negative integers to Alyona. The array should be special. Al 阅读全文

摘要： B. Alyona and flowers Problem Description： Let's define a subarray as a segment of consecutive flowers. The mother suggested some set of subarrays. Al 阅读全文

摘要： A. Alyona and copybooks Problem Description： Little girl Alyona is in a shop to buy some copybooks for school. She study four subjects so she wants to 阅读全文