Greatest Number Time Limit: 1000ms   Memory limit: 65536K  有疑问?点这里^_^ 题目描述 Saya likes math, because she think math can make her cleverer. One day, Kudo invited a very simple game: Given N integers, then the players choose no more than four integers f…

Phone Number Time Limit: 1000ms   Memory limit: 65536K  有疑问?点这里^_^ 题目描述 We know that if a phone number A is another phone number B’s prefix, B is not able to be called. For an example, A is 123 while B is 12345, after pressing 123, we call A, and not…

题目描述 We know thatif a phone number A is another phone number B's prefix, B is not able to becalled. For an example, A is 123 while B is 12345, after pressing 123, we callA, and not able to call B. Given N phone numbers, your task is to find whether t…

题目描述 We know thatIvan gives Saya three problems to solve (Problem F), and this is the firstproblem. "We need a programmer to help us for some projects. If you show us that youor one of your friends is able to program, you can pass the first hurdle. I…

时间限制: 10 Sec 内存限制: 128 MB 题目描述 Given l1,r1,l2,r2,l3,r3,l4,r4, please count the number of four-tuples (x1,x2,x3,x4) such that li≤ xi≤ ri and x1≠x2,x2≠x3,x3≠x4,x4≠x1. The answer should modulo 10^9+7 before output. 输入 The input consists of several test…

题目描述 Orz has two strings of the same length: A and B. Now she wants to transform A into an anagram of B (which means, a rearrangement of B) by changing some of its letters. The only operation the girl can make is to “increase” some (possibly none or…

时间限制: 6 Sec 内存限制: 128 MB 题目描述 In GGO, a world dominated by gun and steel, players are fighting for the honor of being the strongest gunmen. Player Shino is a sniper, and her aimed shot kills one monster at a time. Now she is in an n × n map, and ther…

Description We know that if a phone number A is another phone number B’s prefix, B is not able to be called. For an example, A is 123 while B is 12345, after pressing 123, we call A, and not able to call B. Given N phone numbers, your task is to find…

Description Both Saya and Kudo like balloons. One day, they heard that in the central park, there will be thousands of people fly balloons to pattern a big image. They were very interested about this event, and also curious about the image. Since the…

title: Plumbing the depth of lake 河南省第十届省赛 题目描述: There is a mysterious lake in the north of Tibet. As the sun shines, the surface of the lake is colorful and colorful. The lake was unfathomable in rainy weather.  After the probe,  It has an interesti…