Aladdin and the Flying Carpet LightOJ

终于数学还是咱来学，想想tls当年刷的效率。。自己还是要加油

//#pragma comment(linker, "/STACK:1024000000,1024000000") 
#include<bits/stdc++.h>
#include<stdio.h>
#include<algorithm>
#include<queue>
#include<string.h>
#include<iostream>
#include<math.h>
#include<set>
#include<map>
#include<vector>
#include<iomanip>
using namespace std;
#define ll long long
#define pb push_back
#define FOR(a) for(int i=1;i<=a;i++)
const double PI = acos(-1.0);

const int maxn=1e6+7;
const int mod=998244353;

int prime[maxn+1];
void getprime(){
	memset(prime,0,sizeof prime);
	for(int i=2;i<=maxn;i++){
		if(!prime[i])prime[++prime[0]]=i;
		for(int j=1;j<=prime[0] && prime[j]<=maxn/i;j++){
			prime[prime[j]*i]=1;
			if(i%prime[j]==0)break;
		}
	}
}

ll factor[100][2];
int fatcnt;
int getFactors(ll x){
	fatcnt=0;
	ll tmp=x;
	int ret=1;
	
	for(int i=1;prime[i]<=tmp/prime[i];i++){
		factor[fatcnt][1]=0;
		if(tmp%prime[i]==0){
			factor[fatcnt][0]=prime[i];
			while(tmp%prime[i]==0){
				factor[fatcnt][1]++;
				tmp/=prime[i];
			}
			//fatcnt++;
			ret*=(factor[fatcnt][1]+1);
		}
	}
	if(tmp!=1){
		//factor[fatcnt][0]=tmp;
		//factor[fatcnt++][1]=1;
		ret*=2;
	}
	ret/=2;//毯子算同一种
	//return fatcnt
	return ret;
}

void solve(ll a,ll b,int t){
	if(a/b<b){
		printf("Case %d: 0
",t);return;
	}
	int ans=getFactors(a);

	for(ll i=1;i<b;i++){
		if(a%i==0)ans--;
	}
	printf("Case %d: %d
",t,ans);
}

int main(){
	int T;scanf("%d",&T);
	int t=0;
	getprime();
	while(t!=T){
		t++;
		ll a,b;
		scanf("%lld%lld",&a,&b);
		solve(a,b,t);
	}
}