摘要： 题意：字符串a，字符串b，给你q个区间，让你求a的区间内字符串b出现了多少次 之前用的前缀数组做的，没想起来，发现这个其实也可以 阅读全文

摘要： 分析：看这个数有多少位二进制数 阅读全文

摘要： Katya studies in a fifth grade. Recently her class studied right triangles and the Pythagorean theorem. It appeared, that there are triples of positiv 阅读全文

摘要： output standard output output standard output output There are nn rectangles in a row. You can either turn each rectangle by 9090 degrees or leave it 阅读全文

摘要： B. Sonya and Exhibition time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output B. Sonya and Exhi 阅读全文