Submission #1101113

#TimeUsernameProblemLanguageResultExecution timeMemory
1101113TgX_2Tents (JOI18_tents)C++17
100 / 100
178 ms71536 KiB
/*----------------------------- Author : TgX.2 11Ti - K28 - CHV -----------------------------*/ #include <bits/stdc++.h> using namespace std; #define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i += 1) #define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; i -= 1) #define fi first #define se second #define len(x) (int)((x).size()) #define all(x) (x).begin(), (x).end() #define _ << " " << #define __ << "\n" #define ___ << " " #define ______________TgX______________ main() #define int long long #define intmax 1e9 #define intmin -1e9 #define llongmax 1e18 #define llongmin -1e18 #define memo(a, val) memset((a), (val), sizeof((a))) struct custom { static uint64_t splitmix64(uint64_t x) { x += 0x9e3779b97f4a7c15; x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9; x = (x ^ (x >> 27)) * 0x94d049bb133111eb; return x ^ (x >> 31); } size_t operator()(uint64_t x) const { static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); return splitmix64(x + FIXED_RANDOM); } }; template<class T1, class T2> using cmap = unordered_map<T1, T2, custom>; template<typename T1, typename T2> bool mini(T1 &a, T2 b) {if (a > b) a = b; else return 0; return 1;} template<typename T1, typename T2> bool maxi(T1 &a, T2 b) {if (a < b) a = b; else return 0; return 1;} /*-----------------------------*/ const int maxn = 3007; const int mod = 1e9 + 7; int n, m; int f[maxn][maxn]; int dp(int i, int j) { if (i < 0 or j < 0) return 0; if (i == 0 or j == 0) return 1; int &ans = f[i][j]; if (ans != -1) return ans; ans = 0; (ans += dp(i, j - 1)) %= mod; (ans += ((4 * i) % mod * dp(i - 1, j - 1)) % mod) %= mod; (ans += (i * (i - 1) / 2 % mod * dp(i - 2, j - 1)) % mod) %= mod; (ans += ((i * (j - 1)) % mod * dp(i - 1, j - 2)) % mod) %= mod; return ans; } void process() { cin >> n >> m; memo(f, -1); cout << (dp(n, m) - 1 + mod) % mod; } /*-----------------------------*/ ______________TgX______________ { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen("temp.inp", "r")) { freopen("temp.inp", "r", stdin); freopen("temp.out", "w", stdout); } process(); cerr << "Time: " << 1.0 * clock() / CLOCKS_PER_SEC << " s." __ ; } /*==============================+ |INPUT | --------------------------------| ================================+ |OUTPUT | --------------------------------| ===============================*/

Compilation message (stderr)

tents.cpp:21:41: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   21 | #define ______________TgX______________ main()
      |                                         ^~~~
tents.cpp:84:1: note: in expansion of macro '______________TgX______________'
   84 | ______________TgX______________ {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tents.cpp: In function 'int main()':
tents.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen("temp.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
tents.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen("temp.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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