(全国多校重现赛一)D Dying light

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(全国多校重现赛一)D Dying light

LsF is visiting a local amusement park with his friends, and a mirror room successfully attracts his attention. Inside the mirror room, there are n plane mirrors standing vertically on the ground. They are placed end-to-end and face-to-face so that i…

（全国多校重现赛一）F-Senior Pan

Senior Pan fails in his discrete math exam again. So he asks Master ZKC to give him graph theory problems everyday. The task is simple : ZKC will give Pan a directed graph every time, and selects some nodes from that graph, you can calculate the min…

(全国多校重现赛一) J-Two strings

Giving two strings and you should judge if they are matched. The first string contains lowercase letters and uppercase letters. The second string contains lowercase letters, uppercase letters, and special symbols: "." and "*". . can…

(全国多校重现赛一) H Numbers

zk has n numbers a1,a2,...,ana1,a2,...,an. For each (i,j) satisfying 1≤i<j≤n, zk generates a new number (ai+aj)(ai+aj). These new numbers could make up a new sequence b1,b2,...,bn(n−1)/2b1,b2,...,bn(n−1)/2. LsF wants to make some trouble. While zk i…

（全国多校重现赛一）E-FFF at Valentine

At Valentine's eve, Shylock and Lucar were enjoying their time as any other couples. Suddenly, LSH, Boss of FFF Group caught both of them, and locked them into two separate cells of the jail randomly. But as the saying goes: There is always a way out…

（全国多校重现赛一）B-Ch's gifts

Mr. Cui is working off-campus and he misses his girl friend very much. After a whole night tossing and turning, he decides to get to his girl friend's city and of course, with well-chosen gifts. He knows neither too low the price could a gift be sinc…

(全国多校重现赛一)A-Big Binary Tree

You are given a complete binary tree with n nodes. The root node is numbered 1, and node x's father node is ⌊x/2⌋⌊x/2⌋. At the beginning, node x has a value of exactly x. We define the value of a path as the sum of all nodes it passes(including two e…