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  • P3861 8月月赛A

    https://www.luogu.org/problemnew/show/P3861

    排序:乘数保持单调递增

    dp+hash(map解决)

      1 #include <cstdio>
      2 #include <cstdlib>
      3 #include <cmath>
      4 #include <cstring>
      5 #include <time.h>
      6 #include <string>
      7 #include <set>
      8 #include <map>
      9 #include <list>
     10 #include <stack>
     11 #include <queue>
     12 #include <vector>
     13 #include <bitset>
     14 #include <ext/rope>
     15 #include <algorithm>
     16 #include <iostream>
     17 using namespace std;
     18 #define ll long long
     19 #define minv 1e-6
     20 #define inf 1e9
     21 #define pi 3.1415926536
     22 #define E  2.7182818284
     23 const ll mod=1e9+7;//998244353
     24 const int maxn=1e6+10;
     25 
     26 bool vis[maxn];
     27 ll zhi[maxn],x[maxn],y[maxn],s[maxn],tot[8000];
     28 ll n,nn;
     29 int g=0,g1=0,g2=0,g3=0;
     30 map<int,int>st;
     31 
     32 void getzhi()
     33 {
     34     int i,j,value=1e6;
     35     for (i=2;i<=value;i++)
     36     {
     37         if (!vis[i])
     38         {
     39             g++;
     40             zhi[g]=i;
     41         }
     42         for (j=1;j<=g;j++)
     43         {
     44             if (i*zhi[j]>value)
     45                 break;
     46             vis[i*zhi[j]]=1;
     47             if (i%zhi[j]==0)
     48                 break;
     49         }
     50     }
     51 }
     52 
     53 void getzys(int index,ll value)
     54 {
     55     ll v=1;
     56     int i;
     57     for (i=0;i<=y[index];i++)
     58     {
     59         if (index!=g1)
     60             getzys(index+1,value*v);
     61         else
     62         {
     63             g2++;
     64             s[g2]=value*v;
     65         }
     66         v=v*x[index];
     67     }
     68 }
     69 
     70 void getr(int index,ll value)
     71 {
     72     if (value==1)
     73     {
     74         g3++;
     75         return;
     76     }
     77     if (index==g2+1 || value<s[index])
     78         return;
     79     for (int i=index;i<=g2;i++)
     80         if (value%s[i]==0)
     81             getr(i+1,value/s[i]);
     82 }
     83 
     84 void work()
     85 {
     86     int i,j;
     87 //    g2=-1;  //ignore zys 1
     88     g2=0;
     89     getzys(1,1);
     90 //    g2--;   //ignore zys n
     91     sort(s+1,s+g2+1);
     92 
     93     st.clear();
     94     for (i=1;i<=g2;i++)
     95         st[s[i]]=i;
     96 
     97     //from big to small ,ignore repetition
     98     memset(tot,0,sizeof(tot));
     99     tot[1]=1;
    100     for (i=2;i<g2;i++)      //ascending
    101         for (j=g2;j>=i;j--)  // *s[i]=s[j]
    102             if (s[j]%s[i]==0)
    103                 tot[j]+=tot[st[s[j]/s[i]]];
    104     printf("%lld
    ",tot[g2]);   //- (n*1)
    105 
    106     ///超时
    107 //    g3=0;
    108 //    getr(1,nn);
    109 //    printf("%d
    ",g3);
    110 }
    111 
    112 int main()
    113 {
    114     int t,i;
    115     getzhi();
    116     scanf("%d",&t);
    117     while (t--)
    118     {
    119         scanf("%lld",&n);
    120         nn=n;
    121         g1=0;
    122         for (i=1;i<=g;i++)
    123             if (n%zhi[i]==0)
    124             {
    125                 g1++;
    126                 x[g1]=zhi[i];
    127                 y[g1]=0;
    128                 while (n%zhi[i]==0)
    129                 {
    130                     y[g1]++;
    131                     n/=zhi[i];
    132                 }
    133                 if (n==1)
    134                     break;
    135             }
    136         if (n!=1)
    137         {
    138             g1++;
    139             x[g1]=n;
    140             y[g2]=1;
    141         }
    142         work();
    143     }
    144     return 0;
    145 }
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  • 原文地址:https://www.cnblogs.com/cmyg/p/9542836.html
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