Bubble Cup 12 - Finals [Online Mirror, unrated, Div. 1] E. Product Tuples

题意略,题解生成函数练习题,1+(q-ai)x卷积便可,线段树优化(相似分治思想)html //#pragma GCC optimize(2) //#pragma GCC optimize(3) //#pragma GCC optimize(4) //#pragma GCC optimize("unroll-loops") //#pragma comment(linker, "/stack:200

>>阅读原文<<