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  1. //#pragma GCC optimize("O3", "unroll-loops")
  2. //#pragma GCC target("avx2", "bmi", "bmi2", "lzcnt", "popcnt")
  3.  
  4. #include <bits/stdc++.h>
  5. #define ldb long double
  6. //#define double ldb
  7. #define db double
  8. #define unomap unordered_map
  9. #define unoset unordered_set
  10. #define endl '\n'
  11. #define str string
  12. #define strstr stringstream
  13. #define sz(a) (int)a.size()
  14. #define ll long long
  15. //#define int ll
  16. #define pii pair <int, int>
  17. #define pll pair <ll, ll>
  18. #define Unique(a) a.resize(unique(all(a)) - a.begin())
  19. #define ull unsigned ll
  20. #define fir first
  21. #define sec second
  22. #define idc cin.ignore()
  23. #define lb lower_bound
  24. #define ub upper_bound
  25. #define all(s) s.begin(), s.end()
  26. #define rev reverse
  27. #define gcd __gcd
  28. #define pushb push_back
  29. #define popb pop_back
  30. #define pushf push_front
  31. #define popf pop_front
  32. #define mul2x(a, x) a << x
  33. #define div2x(a, x) a >> x
  34. #define lcm(a, b) (a / __gcd(a, b) * b)
  35. #define log_base(x, base) log(x) / log(base)
  36. #define debug cerr << "No errors!"; exit(0);
  37. #define forw(i, a, b) for (int i = a; i <= b; ++i)
  38. #define forw2(i, a, b) for (ll i = a; i <= b; ++i)
  39. #define fors(i, a, b) for (int i = a; i >= b; --i)
  40. #define fors2(i, a, b) for (ll i = a; i >= b; --i)
  41. #define pqueue priority_queue
  42. #define sqrt sqrtl
  43. #define i128 __int128
  44. #define popcount __builtin_popcountll
  45. #define BIT(x, i) (((x) >> (i)) & 1)
  46. #define MASK(x) ((1LL) << (x))
  47. #define want_digit(x) cout << fixed << setprecision(x);
  48. #define excuting_time 1000.0 * clock() / CLOCKS_PER_SEC
  49. #define mapa make_pair
  50. using namespace std;
  51. const int MOD = 1e9 + 7; // 998244353
  52. const int inf = 1e9;
  53. const ll INF = 1e18;
  54. const int N2 = 1e6;
  55. const int K = 5;
  56.  
  57. mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
  58. ll random(const ll &L, const ll &R) {
  59.     return uniform_int_distribution<ll> (L, R) (rng);
  60. }
  61.  
  62. int n, k;
  63.  
  64. int dp[K + 5][N2 + 5];
  65.  
  66. void add(int &x, const int &y) {
  67.     x += y;
  68.     if (x >= MOD) x -= MOD;
  69. }
  70.  
  71. int calc(int l, int r) {
  72.     return (l + r) * (r - l + 1) / 2;
  73. }
  74.  
  75. void sub2() {
  76.     dp[0][0] = 1;
  77.     forw (i, 1, n) {
  78.         fors (chose, min(i, k), 1) {
  79.             fors (sum, n, i) {
  80.                 add(dp[chose][sum], dp[chose - 1][sum - i]);
  81.             }
  82.         }
  83.     }
  84.     cout << dp[k][n] << endl;
  85. }
  86.  
  87. void sub3() {
  88.     cout << (n - 1) / 2 << endl;
  89. }
  90.  
  91. void solve() {
  92.     cin >> n >> k;
  93.     if (n <= N2) sub2();
  94.     else if (k == 2) sub3();
  95.     else {
  96.         cout << "Nawwww, i gave up\n";
  97.     }
  98. }
  99.  
  100. signed main() {
  101.     ios::sync_with_stdio(false), cin.tie(nullptr);
  102.     srand(time(NULL));
  103.     #define name "test"
  104.     /*
  105.     if (fopen(name".INP", "r")) {
  106.         freopen(name".INP", "r", stdin);
  107.         freopen(name".OUT", "w", stdout);
  108.     }
  109.     */
  110.     bool testCase = false;
  111.     int numTest = 1;
  112. //    cin >> numTest;
  113.     forw (i, 1, numTest) {
  114.         if (testCase) cout << "Case " << i << ": ";
  115.         solve();
  116.     }
  117.     return 0;
  118. }
  119.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
10 3
stdout 
4
https://ideone.com/voATFk
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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