辗转相除法(欧几里得算法) 时间复杂度:在O(logmax(a, b))以内 int gcd(int a, int b) { if (b == 0) return a; return gcd(b, a % b); } 扩展欧几里得算法 时间复杂度和欧几里得算法相同 int extgcd(int a, int b, int& x, int& y) { int d = a; if (b != 0) { d = extgcd(b, a % b, y, x); y -= (a / b) * x;…
题目链接:https://cn.vjudge.net/contest/276376#problem/B 题目大意:for( int i= A ; i != B; i+ = c ),然后给你A,B,C,K,前三个是for循环里面的变量,K指的是每一次ABC三个数都对2^k进行取余,然后问你要使得这个循环停止,最少的循环次数,如果是一个死循环,就输出"FOREVER". 具体思路:和我之前写的那一篇博客思路差不多,证明过程直接上图. 一开始没有注意到B,等号右边应该是B-A,而不是B,以…
C Looooops Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 24355 Accepted: 6788 Description A Compiler Mystery: We are given a C-language style for loop of type for (variable = A; variable != B; variable += C) statement; I.e., a loop w…
C Looooops Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 20128 Accepted: 5405 Description A Compiler Mystery: We are given a C-language style for loop of type for (variable = A; variable != B; variable += C) statement; I.e., a loop which…