摘要： C. Nice Garland You have a garland consisting of nn lamps. Each lamp is colored red, green or blue. The color of the ii-th lamp is si ('R', 'G' and 'B 阅读全文

摘要： D. Diverse Garland You have a garland consisting of n lamps. Each lamp is colored red, green or blue. The color of the ii-th lamp is si('R', 'G' and ' 阅读全文

摘要： G. Array Stabilization You are given an array aa consisting of nn integer numbers. Let instability of the array be the following value: maxi=1nai−mini 阅读全文

摘要： E. Repeating Cipher Polycarp loves ciphers. He has invented his own cipher called repeating. Repeating cipher is used for strings. To encrypt the stri 阅读全文

摘要： B. Divisors of Two Integers Recently you have received two positive integer numbers xx and y. You forgot them, but you remembered a shuffled list cont 阅读全文

摘要： A. Two distinct points You are given two segments l1;r1 and l2;r2 on the xx-axis. It is guaranteed that l1<r1l1<r1 and l2<r2l2<r2. Segments may inters 阅读全文

摘要： I. Powers Of Two A positive integer xx is called a power of two if it can be represented as x=2yx=2y, where y is a non-negative integer. So, the power 阅读全文