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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. unsigned long long F[21];
  6. int M, N;
  7. bool f = true;
  8. int k[1005];
  9.  
  10. void D(int m, int n, int d) {
  11.     if (m == 1) {
  12.         k[d] = n;
  13.         unsigned long long c = F[N];
  14.         for (int i = 0; i <= d; ++i) c /= F[k[i]];
  15.         if (!f) cout << " + ";
  16.         f = false;
  17.         if (c > 1 || !N) cout << c;
  18.         for (int i = 0; i <= d; ++i) {
  19.             if (k[i]) {
  20.                 cout << "x" << (i + 1);
  21.                 if (k[i] > 1) cout << "^" << k[i];
  22.             }
  23.         }
  24.         return;
  25.     }
  26.     for (int i = n; i >= 0; --i) {
  27.         k[d] = i;
  28.         D(m - 1, n - i, d + 1);
  29.     }
  30. }
  31.  
  32. int main() {
  33.     ios_base::sync_with_stdio(false);
  34.     cin.tie(NULL);
  35.     F[0] = 1;
  36.     for (int i = 1; i <= 20; ++i) F[i] = F[i - 1] * i;
  37.     if (cin >> M >> N && M > 0 && N >= 0 && N <= 20) {
  38.         D(M, N, 0);
  39.         cout << '\n';
  40.     }
  41.     return 0;
  42. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/HrQADO
10,10
language:
C++14 (gcc 8.3)
created:
6 hours ago
visibility:
public

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