A. Lucky Division time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains…
E. Lucky Array Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467are not. Petya has an arra…
E. Lucky Array time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains onl…
B. Rectangle and Square 题目连接: http://codeforces.com/contest/135/problem/B Description Little Petya very much likes rectangles and especially squares. Recently he has received 8 points on the plane as a gift from his mother. The points are pairwise di…
A. Prime Permutation 题目连接: http://www.codeforces.com/contest/123/problem/A Description You are given a string s, consisting of small Latin letters. Let's denote the length of the string as |s|. The characters in the string are numbered starting from…
time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output One hot summer day Pete and his friend Billy decided to buy a watermelon. They chose the biggest and the ripest one, in their opinion. After t…
A. Football time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a…
