摘要：B. Nikita and string time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output One day Nikita foun 阅读全文

摘要：D. Make a Permutation! time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output D. Make a Permuta 阅读全文

摘要：C. Qualification Rounds time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output C. Qualification 阅读全文