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P3704 [SDOI2017]數字表格

#include <iostream>
#include <cstdio>
#include <queue>
#include <algorithm>
#include <cmath>
#include <cstring>
#define inf 2147483647
#define N 1000010
#define mod 1000000007
#define p(a) putchar(a)
#define For(i,a,b) for(long long i=a;i<=b;++i)
//by war
//2020.8.7
using namespace
std; long long T,n,m,cnt,ans,a,b,c,d,k; long long prime[N],mu[N],f[N],F[N],g[N],prod[N]; bool vis[N]; void in(long long &x){ long long y=1;char c=getchar();x=0; while(c<'0'||c>'9'){if(c=='-')y=-1;c=getchar();} while(c<='9'&&c>='0'){ x=(x<<1)+(x<<3)+c-'0';c=getchar();} x
*=y; } void o(long long x){ if(x<0){p('-');x=-x;} if(x>9)o(x/10); p(x%10+'0'); } long long ksm(long long a,long long b){ long long r=1; while(b>0){ if(b&1) r=r*a%mod; a=a*a%mod; b>>=1; } return r; } void Euler(long long n){ mu[1]=1
; f[0]=0;f[1]=F[0]=F[1]=prod[0]=g[0]=g[1]=1; For(i,2,n){ if(!vis[i]) prime[++cnt]=i,mu[i]=-1; for(long long j=1;j<=cnt&&i*prime[j]<=n;j++){ vis[i*prime[j]]=1; if(i%prime[j]==0){ mu[i*prime[j]]=0; break; } mu[i*prime[j]]=-mu[i]; } F[i]=1; f[i]=(f[i-1]+f[i-2])%mod; g[i]=ksm(f[i],mod-2); } For(i,1,n){ if(mu[i]!=0){ for(long long j=i;j<=n;j+=i) F[j]=F[j]*(mu[i]==1?f[j/i]:g[j/i])%mod; } prod[i]=prod[i-1]*F[i]%mod; } } long long solve(long long n,long long m){ long long r=1,k; for(long long i=1,j;i<=n;i=j+1){ j=min(n/(n/i),m/(m/i)); k=prod[j]*ksm(prod[i-1],mod-2)%mod; r=r*ksm(k,(n/i)*(m/i)%(mod-1))%mod; } return r; } signed main(){ Euler(1e6); in(T); while(T--){ in(n);in(m); if(n>m) swap(n,m); ans=solve(n,m); o(ans);p('\n'); } return 0; }

//這場比賽我去現場打過,所以我對這題很有印象,當時只會暴力...