I Think I Need a Houseboat Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 85149 Accepted: 36857 Description Fred Mapper is considering purchasing some land in Louisiana to build his house on. In the process of investigating the land,…
A Simple Problem with Integers Time Limit: 5000MS Memory Limit: 131072K Total Submissions: 135904 Accepted: 42113 Case Time Limit: 2000MS Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type o…
首先 m = 1 时 ans = 0对于 m > 1 的 情况 由于 1 到 m-1 中所有和m互质的数字,在 对m的乘法取模 运算上形成了群 ai = ( 1<=a<m && gcd(a,m) == 1 ) 所以 对于 a 必然存在b = a^(-1) = inv(a) 使得 a * b = 1 (mod m) 这里存在两种情况 a != b 那么最后的连乘式中a b均出现一次,相乘得1 a == b 那么最后的连乘式中只出现一个a 实际上所有 a = inv(a) 的…
The Android University ACM Team Selection Contest Time Limit: 1000ms Memory limit: 65536K 有疑问?点这里^_^ 题目描述 Now it's 20000 A.D., and the androids also participate in the ACM Inter-national Collegiate Programming Contest (ACM/ICPC). In order to sele…