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  1. #include<stdio.h>
  2. #include<algorithm>
  3. #include<iostream>
  4. using namespace std;
  5. long long  b,i,x,v,c,ans,anc;
  6. int j,k,a[20];
  7. main(){
  8.  
  9.     // freopen("a.in","r",stdin);
  10.    //  freopen("a.out","w",stdout);
  11.  
  12.      cin>>b;
  13.      k=0; x=1; j=0;
  14.      while(b!=0) {a[k]=b%10; b/=10; k++;} for (i=1; i<k; i++) x*=10; if (k==0) x=0; //cout<<x<<" ";
  15. k--;
  16.      while(x!=0) {
  17.         v=45*(x/10)*k;
  18.         c=(a[k]*(a[k]-1)/2)*x+v*a[k]+a[k];
  19.         ans+=j*a[k]*x+c; j+=a[k];
  20.         x/=10; k--;
  21.  
  22.      }  //cout<<ans<<" ";
  23.      ans-=j;
  24.  
  25.    cin>>b;
  26.       k=0; x=1; j=0;
  27.      while(b!=0) {a[k]=b%10; b/=10; k++;} for (i=1; i<k; i++) x*=10; //cout<<x;
  28. k--;
  29.      while(x!=0) {
  30.         v=45*(x/10)*k; //cout<<"v=="<<v<<" ";
  31.         c=(a[k]*(a[k]-1)/2)*x+v*a[k]+a[k]; //cout<<"c=="<<c<<" ";
  32.         anc+=j*a[k]*x+c;  j+=a[k]; //cout<<"anc=="<<anc<<" ";
  33.         x/=10; k--; //cout<<endl;
  34.  
  35.      }
  36.  
  37.  
  38.  
  39.       cout<<anc-ans;
  40.  
  41. }
Success #stdin #stdout 0s 5396KB
comments (?)
stdin
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9999999999999
9999999999999
stdout
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117
https://ideone.com/H03j1H
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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