摘要：
ans = (m+n)!*(m-n+1)/(m+1).大数乘小数，大数除小数。View Code 1 /* 2 Author:Zhaofa Fang 3 Lang:C++ 4 */ 5 #include <cstdio> 6 #include <cstdlib> 7 #include <sstream> 8 #include <iostream> 9 #include <cmath>10 #include <cstring>11 #include <algorithm>12 #include <strin 阅读全文