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  1. /*
  2. *LINK:
  3. *nilabja16180
  4. */
  5. #include <bits/stdc++.h>
  6. using namespace std;
  7.  
  8. #define inf (1<<30)
  9. #define INF (int)1e9
  10. #define EPS 1e-9
  11. #define PI 3.1415926535897932384626433832795
  12. #define MOD 1000000007
  13. #define MAX 1000000
  14.  
  15. #define write(x) freopen(x,"w",stdout);
  16. #define read(x) freopen(x,"r",stdin);
  17. #define D(x)        cerr << #x " = " << (x) <<endl;
  18.  
  19. inline int setBit(int N, int pos) { return N = N | (1<<pos);}
  20. inline int resetBit(int N, int pos) { return N = N & ~(1<<pos);}
  21. inline bool checkBit(int N, int pos) { return (bool) (N & ( 1<<pos));}
  22. //setbase - cout << setbase (16); cout << 100 << endl; Prints 64
  23. //setfill -   cout << setfill ('x') << setw (5); cout << 77 << endl; prints xxx77
  24. //setprecision - cout << setprecision (4) << f << endl; Prints x.xxxx
  25.  
  26. //int fx[] = {+0, +0, +1, -1, -1, +1, -1, +1};
  27. //int fy[] = {-1, +1, +0, +0, +1, +1, -1, -1};
  28.  
  29. typedef long long ll1;
  30. typedef unsigned long long ll;
  31. typedef string st;
  32. typedef long long int lli;
  33. typedef vector<int> vi;
  34. typedef vector<st> vs;
  35. typedef map<int,int> mii;
  36. typedef map<st,int> msi;
  37. typedef set<int> si;
  38. typedef set<st> ss;
  39. typedef pair<int,int> pii;
  40. typedef vector<pii> vpii;
  41. typedef vector<ll> vll;
  42. ll dp[MAX];
  43. ll calculate(int n){
  44.       ll res=0;
  45.       int i=0;
  46.       int k1=1;
  47.       int rev=0;
  48.       while(n>0){
  49.             int a=n%10;
  50.             res = res + k1*((a*(a-1))/2)+dp[i]*(a)+a*(rev+1);
  51.             rev=rev+a*k1;
  52.             n=n/10;
  53.             k1*=10;
  54.             i++;
  55.            // cout<<res<<endl;
  56.       }
  57.       return res;
  58. }
  59.  
  60. int main() {
  61.       ios_base::sync_with_stdio(false);
  62.       cin.tie(NULL);
  63.       memset(dp,0,sizeof(dp));
  64.       dp[0]=0;
  65.       int val=1;
  66.       for(int i=1;i<=9;i++){
  67.             dp[i]=val*45 + dp[i-1]*10;
  68.             val*=10;
  69.            // cout<<dp[i]<<endl;
  70.       }
  71.       while(1){
  72.             int a,b;
  73.             cin>>a>>b;
  74.             if(a==-1 && b==-1)
  75.                   break;
  76.             ll ans=calculate(b)-calculate(a-1);
  77.             cout<<ans<<endl;
  78.       }
  79. 	//cout<<"Execution time : "<<tick();
  80.       return 0;
  81. }
  82.  
Runtime error #stdin #stdout 0.03s 23872KB
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https://ideone.com/jAMGGM
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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