O - 计数 Time Limit:2000MS Memory Limit:262144KB 64bit IO Format:%I64d & %I64u Description Gerald got a very curious hexagon for his birthday. The boy found out that all the angles of the hexagon are equal to . Then he measured the length of…
Description Gerald got a very curious hexagon for his birthday. The boy found out that all the angles of the hexagon are equal to . Then he measured the length of its sides, and found that each of them is equal to an integer number of centimeters. Th…
Description As Harry Potter series is over, Harry has no job. Since he wants to make quick money, (he wants everything quick!) so he decided to rob banks. He wants to make a calculated risk, and grab as much money as possible. But his friends - Hermi…
J - 数论,质因数分解 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with m…
Description Gerald got a very curious hexagon for his birthday. The boy found out that all the angles of the hexagon are equal to . Then he measured the length of its sides, and found that each of them is equal to an integer number of centimeters. Th…
Description Given a dice with n sides, you have to find the expected number of times you have to throw that dice to see all its faces at least once. Assume that the dice is fair, that means when you throw the dice, the probability of occurring any fa…
Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with many excellent boys who have no chance to attend the Province-Final. Now, your task is relaxi…
Description The Sky is Sprite. The Birds is Fly in the Sky. The Wind is Wonderful. Blew Throw the Trees Trees are Shaking, Leaves are Falling. Lovers Walk passing, and so are You. ................................Write in English class by yifenf…
F - 概率(经典问题) Time Limit:2000MS Memory Limit:32768KB 64bit IO Format:%lld & %llu Description Sometimes some mathematical results are hard to believe. One of the common problems is the birthday paradox. Suppose you are in a party where there…
E - 期望(经典问题) Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%lld & %llu Description Given a dice with n sides, you have to find the expected number of times you have to throw that dice to see all its faces at least once. Assume that…
G - 数论,最大公约数 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description There is a hill with n holes around. The holes are signed from 0 to n-1. A rabbit must hide in one of the holes. A wolf searches the rabbit in ant…
Description During the early stages of the Manhattan Project, the dangers of the new radioctive materials were not widely known. Vast new factory cities were built to manufacture uranium and plu- tonium in bulk. Compounds and solutions of these sub…
E - 期望(经典问题) Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%lld & %llu Submit Status Description Given a dice with n sides, you have to find the expected number of times you have to throw that dice to see all its faces at least once.…
第六周练习I题 I - 数论,线性方程 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description The Sky is Sprite. The Birds is Fly in the Sky. The Wind is Wonderful. Blew Throw the Trees Trees are Shaking, Leaves are Falling. Lov…
