【BZOJ 2393】Cirno的完美算数教室



#define LL long long 
using namespace std;

const int MAXN = 2000;

int l,r,arr[MAXN],tmp[MAXN],vout,cnt,tot;

void DFS(LL w){
	if (w > r) return;
	tmp[++cnt] = w;

inline void prework(){
	DFS(2); DFS(9);
	for (int i=1,tag=0;i<=cnt;i++,tag=0) {
		for (int j=i-1;j;j--) if (tmp[i] % tmp[j] == 0) {tag = 1; break;}
		if (!tag) arr[++tot] = tmp[i];
	for (int i=1;i*2<=tot;i++) swap(arr[i],arr[tot-i+1]);

int GCD(int a, int b){return b?GCD(b,a%b):a;}

void solve(int step, int sz, int w){
	if (step == tot+1) {
		if (sz & 1) vout += r/w - (l-1)/w;
		else if (sz) vout -= r/w - (l-1)/w;
	} else {
		LL buf = (LL)w/GCD(w,arr[step])*arr[step];
		if (buf <= r) solve(step+1,sz+1,buf);

int main(){
	return 0;

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