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  1.  
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define endl "\n"
  5. #define int long long
  6. #define faster() ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  7. const int MOD = 1e9 + 7 ;
  8. void solve() {
  9.     int r , g ; cin >> r >> g ;
  10.     int total = r + g ; // tong so khoi ban dau
  11.     int h = 0 ;
  12.     while(h * (h + 1) / 2 <= total) ++h ;
  13.     --h ;// tim chieu cao toi da cua thap 
  14.  
  15.     vector<int> dp(r + 5 , 0); // dp[i] : dung i mau do de xay dung cap do
  16.     dp[0] = 1 ; // chua su dung cac mau do thi chi co 1 cach la khong lam gi
  17.  
  18.     for(int i = 1 ; i <= h ; i++){
  19.         for(int j = r ; j >= i ; j--){
  20.             dp[j] += dp[j - i];
  21.             dp[j] %= MOD ;
  22.         }
  23.     }
  24.  
  25.     int ans = 0 ;
  26.     int maxBlocks = (h + 1) * h / 2 ;
  27.     for(int i = 0 ; i <= r ; i++){
  28.         int greenBlock = maxBlocks - i ;
  29.         if(greenBlock >= 0 && greenBlock <= g){
  30.             ans += dp[i];
  31.             ans %= MOD ;
  32.         }
  33.     }
  34.     cout << ans << endl;
  35. }
  36.  
  37. signed main() {
  38.     faster();
  39.     int test = 1 ;
  40.     // cin >> test ;
  41.     while(test--)   solve();
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5268KB
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https://ideone.com/M1U9eY
language:
C++14 (gcc 8.3)
created:
53 days ago
visibility:
public

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