题目的输入是一行,2个空格分开的整数n, k
约定:0 < n,k < 1百万
10 3
4
2018年真题精选
2194,2276,2277,2279,2280,2281,2282,2283,2284,2285,2286,2287,
2288,2291,2292,2294,2296