# include # include # include # include # include # include # include using namespace std; typedef long long ll; typedef double ld; const double eps = 1e-7; const int maxn = 1e5 + 5; typedef v...
递推算法使用“步步为营”的方法，不断利用已有的信息推导出新的东西顺推法：是指从已知条件出发，逐步推算出要解决问题的方法逆推法是指从已知的结果出发，用迭代表达式推算出问题的开始条件，即顺推法的逆过程例1#include <stdio.h>#include NUM 13int main(){ int i; &n
