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  1. #include "bits/stdc++.h"
  2. using namespace std;
  3. const int N = 5e3 + 3;
  4. const int mod = 1988;
  5. inline int add(int a , int b){
  6.     int res = a + b;
  7.     if(res >= mod){
  8.         return res - mod;
  9.     }
  10.     return res;
  11. }
  12. int n , k;
  13. int dp1[N][N];
  14. int dp2[N][N];
  15. void pre(){
  16.     for(n = 0 ; n < N ; ++n){
  17.         dp1[n][1] = 1;
  18.         dp2[n][1] = add(((n >= 2) ? dp2[n - 2][1] : 0) , dp1[n][1]);
  19.         for(k = 2 ; k < N ; ++k){
  20.             dp1[n][k] = dp2[n][k - 1];
  21.             dp2[n][k] = add(((n > k) ? dp2[n - k - 1][k] : 0) , dp1[n][k]);
  22.         }
  23.     }
  24. }
  25. int main(){
  26.     pre();
  27.     while(~scanf("%d %d" , &n , &k)){
  28.         if(n + k){
  29.             printf("%d\n" , dp1[n - k][k]);
  30.         }
  31.     }
  32. }
Success #stdin #stdout 0.49s 198976KB
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https://ideone.com/00lC3P
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
secret

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