链接: https://codeforces.com/contest/1245/problem/D 题意: Shichikuji is the new resident deity of the South Black Snail Temple. Her first job is as follows: There are n new cities located in Prefecture X. Cities are numbered from 1 to n. City i is locate…
链接: https://codeforces.com/contest/1245/problem/C 题意: Constanze is the smartest girl in her village but she has bad eyesight. One day, she was able to invent an incredible machine! When you pronounce letters, the machine will inscribe them onto a pie…
链接: https://codeforces.com/contest/1245/problem/B 题意: Let n be a positive integer. Let a,b,c be nonnegative integers such that a+b+c=n. Alice and Bob are gonna play rock-paper-scissors n times. Alice knows the sequences of hands that Bob will play. H…
链接: https://codeforces.com/contest/1245/problem/A 题意: Consider the set of all nonnegative integers: 0,1,2,-. Given two integers a and b (1≤a,b≤104). We paint all the numbers in increasing number first we paint 0, then we paint 1, then 2 and so on. Ea…
F. Daniel and Spring Cleaning While doing some spring cleaning, Daniel found an old calculator that he loves so much. However, it seems like it is broken. When he tries to compute 1+3 using the calculator, he gets 2 instead of 4. But when he tries co…
E. Hyakugoku and Ladders Hyakugoku has just retired from being the resident deity of the South Black Snail Temple in order to pursue her dream of becoming a cartoonist. She spent six months in that temple just playing "Cat's Cradle" so now she w…
C. Constanze's Machine Constanze is the smartest girl in her village but she has bad eyesight. One day, she was able to invent an incredible machine! When you pronounce letters, the machine will inscribe them onto a piece of paper. For example, if yo…
