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Integer Factorization

Jul 24th, 2016
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define PB push_back
  4. #define ZERO (1e-10)
  5. #define INF (1<<30)
  6. #define CL(A,I) (memset(A,I,sizeof(A)))
  7. #define DEB printf("DEB!\n");
  8. #define D(X) cout<<"  "<<#X": "<<X<<endl;
  9. #define EQ(A,B) (A+ZERO>B&&A-ZERO<B)
  10. typedef long long ll;
  11. typedef pair<ll,ll> pll;
  12. typedef vector<int> vi;
  13. typedef pair<int,int> ii;
  14. #define IN(n) int n;scanf("%d",&n);
  15. #define FOR(i, m, n) for (int i(m); i < n; i++)
  16. #define REP(i, n) FOR(i, 0, n)
  17. #define F(n) REP(i, n)
  18. #define FF(n) REP(j, n)
  19. #define FT(m, n) FOR(k, m, n)
  20. #define aa first
  21. #define bb second
  22. ll R[]={2,3,5,7,11,13,17,19,23,29,31,37},nt(INF);
  23. ll mm(ll a,ll b,ll M){
  24.     if(a<INF&&b<INF)return (a*b)%M;
  25.     ll v(0),w(a%M);
  26.     while(b)v=b&1?(v+w)%M:v,w=(w<<1)%M,b>>=1;
  27.     return v%M;
  28. }
  29. ll pw(ll n,ll k,ll M){
  30.     ll r=1;
  31.     while(k){
  32.         if(k&1)r=mm(r,n,M);
  33.         n=mm(n,n,M),k>>=1;
  34.     }
  35.     return r%M;
  36. }
  37. bool isP(ll n){
  38.     if(n<2)return 0;
  39.     if(!(n&1))return n==2;
  40.     ll s=n-1;
  41.     while(!(s&1))s>>=1;
  42.     if(n<40){FT(3,n)if(!(n%k))return 0;return 1;}
  43.     F(12){
  44.         ll z(R[i]),t(s),r(pw(z,t,n));
  45.         if(r==1||!~r==-1)continue;
  46.         while(t!=n-1&&r!=n-1)
  47.             r=mm(r,r,n),t<<=1;
  48.         if(r!=(n-1))return 0;
  49.     }
  50.     return 1;
  51. }
  52. ll rnd(int b){
  53.     ll r(0);
  54.     F(b)r<<=1,r|=rand()&1;
  55.     return r;
  56. }
  57. ll gcd(ll a,ll b){  
  58.     return b?gcd(b,a%b):a;    
  59. }
  60. ll rho(ll N) {
  61.     if(!(N&1))return 2;
  62.     ll d,c(rnd(ceil(log2(N)-ZERO))),x(rnd(ceil(log2(N)-ZERO))),xx=x;
  63.     do{
  64.         x=mm(x,x,N),x+=c,x%=N;
  65.         xx=mm(xx,xx,N),xx+=c,xx%=N;
  66.         xx=mm(xx,xx,N),xx+=c,xx%=N;
  67.         d=gcd(llabs(x-xx),N);
  68.     }while(d==1);
  69.     return d;
  70. }
  71. int ff(ll N,ll*f,int L){
  72.     if(N<=1)return L;
  73.     if(isP(N))return f[L]=N,++L;
  74.     ll d(rho(N));
  75.     return ff(N/d,f,ff(d,f,L));
  76. }
  77. int fc(ll N,ll*f,int*c){
  78.     static ll G[66];
  79.     int L(ff(N,G,0)),I(0),l(0);
  80.     G[L]=-1;
  81.     sort(G,G+L);
  82.     while(I<L){
  83.         f[l]=G[I++],c[l]=1;
  84.         while(G[I]==G[I-1])++c[l],++I;
  85.         ++l;
  86.     }
  87.     return l;
  88. }
  89. ll N,f[64];
  90. int h,c[64];
  91. int main(void){
  92.     while(scanf("%lld",&N),N){
  93.         h=fc(N,f,c);
  94.         F(h){
  95.             if(i)putchar_unlocked(32);
  96.             printf("%lld^%d",f[i],c[i]);
  97.         }
  98.         putchar_unlocked(10);
  99.     }
  100.     return 0;
  101. }
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