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B. Divisiblity of Differences time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output You are given a multiset of n

欧拉筛法求素数将所有合数标记，保证不被重复筛除，时间复杂度为O（n）#include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using namespace std; const int maxn = 3000050; int prime[maxn]; ...