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  1. /****************#####    بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيم   #####********************
  2. __________________________________________________________________________
  3. ######################  Ya-Seen Arafat(ACWizard) #########################
  4. ######################        UAP-CSE-33B        #########################
  5. *************************************************************************/
  6. #include <bits/stdc++.h>
  7. #define sc(n) scanf("%d", &n)
  8. #define S 303
  9. using namespace std;
  10. typedef long long LL;
  11.  
  12. int n, low, high;
  13. int make[S];
  14. LL dp[S][S][S];
  15.  
  16. LL Pay(int ind, int tot, int term){
  17.     if(term > high)return 0LL;
  18.     if(tot < 0)return 0LL;
  19.     if(term >= low && term <= high && tot == 0)return 1LL;
  20.     if(dp[ind][tot][term] != -1)return dp[ind][tot][term];
  21.     dp[ind][tot][term] = 0;
  22.     for(int i = ind; i < n; i++){
  23.         dp[ind][tot][term] += Pay(i, tot-make[i], term+1);
  24.     }
  25.     return dp[ind][tot][term];
  26. }
  27.  
  28. void Do(){
  29.     string str;
  30.     while(getline(cin, str)){
  31.         istringstream cinn(str);
  32.         int sz = str.size();
  33.         int sp = 0;
  34.         for(int i = 0; i < sz; i++)if(str[i] == ' ')sp++;
  35.         if(sp == 0)cinn >> n, low = 1, high = n;
  36.         if(sp == 1)cinn >> n, cinn >> high, low = 1;
  37.         if(sp == 2)cinn >> n, cinn >> low, cinn >> high;
  38.         for(int i = 0; i < n; i++)make[i] = i+1;
  39.         reverse(make, make+n);
  40.         memset(dp, -1, sizeof(dp));
  41.         cout << Pay(0, n, 0) << endl;
  42.     }
  43. }
  44.  
  45. int main(){
  46.     ios_base::sync_with_stdio(0); cin.tie(0);
  47.     #ifndef ONLINE_JUDGE
  48.     ///freopen("inp","r",stdout);
  49.     ///freopen("contest.txt","w",stdout);
  50.     #endif
  51.     Do();
  52.     return 0;
  53. }
  54.  
  55.  
  56.  
  57.  
  58.  
Success #stdin #stdout 1.08s 220608KB
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9253082936723602
5006529163060
3972999029388
3972999029388
1641900823
https://ideone.com/QaYVoH
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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