/*
`-:://:::-
`//:-------:/:`
.+:--.......--:+`
`+:--..`````..--//`
.o:--..`` ``..--:o`
.o:--...```..---+/`
`/y+o/---....---:+o.
`...````-os+/:---:/+o/--.`
`-/+++++/:. `...` :h+d+oooo+/+-` ...
`/++//:::://++-`....` -.`//````````:` `..`
`o+/::------://o/` `-` -. -` `..`
`---.-o/:./o/::-..``..-ЗАПУСКАЕМ .. .. -` `... ``..``
`....o+:-++/:--.```..-://s. `-` .- -` `-o: .-//::::/:-`
`:s+/:--....-::/+s-` .- `- -` -///:--------:/:`
./s+//:::::://oo-``..НЕЙРОННУЮ: СЕТЬ:::::::-`РАБОТЯГИ `+:--........--:/`
.:ooo+++++osso-` `.:-...`/` ./::-------:/:` -` :+--..``````.--:+:...-+:-`
`.-/+++++/+-.-` -. ``:so:/:--.......--:+` `-```````o+/+--..`````..--:o/-..:s+:.
```````:``.. `-` -` `+:--..`````..--/+-.../.`````..-o:--.......---/o. `
`: `:- -. .o:--..`` ``..--:o` `-` `:o+:--------:+o-`
`-`-... .. .o/--...```..--:+/` `-` `oy/so/////++o/.`
-/` `-` `- ``+s/o/:---...---:++. `-` .-../d://///:-.`
`.---..``-..- .-/..`````-oo+/:::::/+o+- `-``-` `-. ````
`:++++/+++++- ..``.-/:` /y-:/++o++/:.`..` ./. `-
-++/::::::://+/..:-``:` .. `-.` ```.``` `..` `..`-` `-
`` -o//:--....-::/++` -.-` `-`.-` `..`..` `-.-
-----ss+:++/:--.```..-://s. /. `:: `-:. ./`
`````/:..+o/::-..``.--:/+s. ..-` `-``-` ..` `-` `-`-`
`-s+/::-----::/+oo---``-` .. .:- ``` .-` .-.- `-`
`:oo+//::://+os/..:`..-/:` :y.-:::::::.`.-` ./-` `-`
`./+oooooooo+/.`- .-:...`.. .//:-------://` `- `..` `:.
``.-::::-.``-/` `-` `- `oo:+:--.......--:/` `- `.:--h.``..```
-.-`.- .- `+:--..`````..--//` `- /s-//::::::::.
-` `/- .. .o:--..`` ``..--:o.```.- `//:--------://`
-` .-`.-` -.`-o/--...```..--:+/.``-:....``:-.+:--....`...--:+`
..`-. `-. ``:os:o/:---...---:++. `- ``///+:-..``````.--:+-````-.`
`.:///////.-` .:-..` -``-+o+/:::::/+o/. `- `:+:-..`````..--:o/:--/ys+-
`-++///////+o/. ``....`-. :` `.:++++++/:.` .- -o/---......---/o. `.`
`++//:-----::/+o:..` .-` : ``````` .- `+so+:--------:++-`
`````:-``:o/::-..`..--:/+o` -. `- .- `../../+o+////+o+:.`
-----syo/o+/:--.```..-://s. .-` `- .- `... ``-:////:-``
.` `/s//:--....-::/+s. -. `-` .- `..`
.+o+/:::--:://+s/-..` .::+y ``` .- `..`
./oo++////+oso-` `.... :y-+:::::::/` ...
`.:+oooooo/-` `....-. .//:-------:/:-.`
``...`` /+:+:--.......--:+`
`+:--..`````..--//`
.o:--..`` ``..--:o`
.+/--...```..--:+/`
`-o/:---...---:++.
`-+o+/:---:/+o/.
`.:+oooo+/-.`
``````
*/
#ifdef aimbot
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")
#endif
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <map>
#include <set>
#include <queue>
#include <ostream>
#include <istream>
#include <typeinfo>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <limits>
#include <fstream>
#include <array>
#include <list>
#include <bitset>
#include <functional>
#include <random>
#include <cstring>
#include <chrono>
#define random escape__from__random__aetuhoetnuhshe
#define mt make_tuple
#define x first
#define y second
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define umap unordered_map
#define uset unordered_set
#define elif else if
#define len(v) ((int)v.size())
#define f(i, n) for (int i = 0; i < (n); i++)
#define rof(i, n) for (int i = ((n) - 1); i >= 0; i--)
#define apply(v, act) for (auto &x : v) { act; }
#define log(args...) {string s = #args;deque<string> deq;\
string buf = "";int bal = 0;for (char c : s) {\
if (c == '(' || c == '[' || c == '{') {bal++;\
} else if (c == ')' || c == ']' || c == '}') {\
bal--;} else {if (bal == 0) {if (c == ',') {\
deq.pb(buf);buf = "";} else {if (c != ' ') {\
buf += c;}}}}}if (!buf.empty()) {deq.pb(buf);}\
smart_io::precall_print();smart_io::_print(deq, args);}
inline int min(const int &x, const int &y) { return (((y-x)>>(32-1))&(x^y))^x; }
inline int max(const int &x, const int &y) { return (((y-x)>>(32-1))&(x^y))^y; }
inline long long min(const long long &x, const long long &y) { return (((y-x)>>(64-1))&(x^y))^x; }
inline long long max(const long long &x, const long long &y) { return (((y-x)>>(64-1))&(x^y))^y; }
#define print \
smart_io::precall_print(); \
cout,
#define scan cin,
#ifdef fast_allocator
const int MAXMEM = 200 * 1000 * 1024;
char _memory[MAXMEM];
size_t _ptr = 0;
void* operator new(size_t _x) { _ptr += _x; assert(_ptr < MAXMEM); return _memory + _ptr - _x; }
void operator delete (void*) noexcept {}
#endif
using namespace std;
char string_in_buffer[(int)260];
void fast_scan(int &x) { scanf("%d", &x); }
void fast_scan(long long &x) { scanf("%lld", &x); }
void fast_scan(unsigned long long &x) { scanf("%llu", &x); }
void fast_scan(double &x) { scanf("%lf", &x); }
void fast_scan(long double &x) { scanf("%Lf", &x); }
void fast_scan(char &x) {
scanf("%c", &x);
if (x == '\n') {
fast_scan(x);
}
}
void fast_scan(string &x) {
scanf("%s", string_in_buffer);
x = string(string_in_buffer);
}
template<class TFirst, class TSecond>
void fast_scan(pair<TFirst, TSecond> &p) {
fast_scan(p.first);
fast_scan(p.second);
}
template <class T>
void fast_scan(vector<T> &v) {
for (auto &x : v) fast_scan(x);
}
void fast_print(const int &x) { printf("%d", x); }
void fast_print(const unsigned int &x) { printf("%u", x); }
void fast_print(const long long &x) { printf("%lld", x); }
void fast_print(const unsigned long long &x) { printf("%llu", x); }
void fast_print(const double &x) { printf("%.15lf", x); }
void fast_print(const long double &x) { printf("%.15Lf", x); }
void fast_print(const char &x) { printf("%c", x); };
void fast_print(const string &x) { printf("%s", x.c_str());}
void fast_print(const char v[]) { fast_print((string)v); }
template<class TFirst, class TSecond>
void fast_print(const pair<TFirst, TSecond> &p) {
fast_print(p.first);
fast_print(' ');
fast_print(p.second);
}
template <class T>
void fast_print(const vector<T> &v) {
if (v.empty()) return;
fast_print(v[0]);
for (int i = 1; i < v.size(); i++) {
fast_print(' ');
fast_print(v[i]);
}
}
template <class T>
void fast_print(const vector<vector<T>> &v) {
if (v.empty()) return;
fast_print(v[0]);
for (int i = 1; i < v.size(); i++) {
fast_print('\n');
fast_print(v[i]);
}
}
template <class T>
void fast_print(const T &v) {
for (const auto &x : v) {
fast_print(x);
fast_print(' ');
}
}
using namespace std;
namespace smart_io {
string print_start = "";
string sep = " ";
bool first_print = false;
void precall_print() {
fast_print(print_start);
print_start = "\n";
first_print = true;
}
void _print(deque<string>) {}
template<class T, class... Args>
void _print(deque<string> names, T elem, Args... args) {
if (!first_print) {
fast_print("\n");
} else {
first_print = false;
}
fast_print(names.front());
fast_print(" = ");
fast_print(elem);
names.pop_front();
_print(names, args...);
}
} //namespace smart_io
template <class T>
ostream &operator,(ostream &os, const T &object) {
if (!smart_io::first_print) {
fast_print(smart_io::sep);
} else {
smart_io::first_print = false;
}
fast_print(object);
return os;
}
template <class T>
istream &operator,(istream &is, T &object) {
fast_scan(object);
return is;
}
namespace random {
using namespace std::chrono;
mt19937 rng(duration_cast< milliseconds >(
system_clock::now().time_since_epoch()
).count());
uniform_real_distribution<> prob_dist(0.0, 1.0);
};
namespace typedefs {
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef long double ld;
}
namespace numbers_operation {
template<class T>
T floor_mod(T a, T b) {
if (a >= 0 && b >= 0) return a % b;
if (a <= 0 && b <= 0) return a % b;
return abs(b) - (abs(a) % abs(b));
}
}
using namespace numbers_operation;
using namespace typedefs;
using namespace random;
const ll MOD = 1e9 + 7;
const int N = 3010;
ll mem[N][N];
ll fast_pow(ll x, ll p) {
if (p == 0) return 1;
if (p & 1) {
return (fast_pow(x, p - 1) * x) % MOD;
} else {
ll sub = fast_pow(x, p / 2);
return (sub * sub) % MOD;
}
}
ll dp(int h, int w) {
if (w < 0 || h < 0) return 0;
if (h == 0) return 1;
if (mem[h][w]) return mem[h][w];
return mem[h][w] = (dp(h - 1, w - 2) * (w * (w - 1) / 2)
+ dp(h - 2, w - 1) * w * (h - 1)
+ dp(h - 1, w - 1) * 4 * w
+ dp(h - 1, w)) % MOD;
}
signed main(signed argc, char *argv[]) {
int h, w;
scan h, w;
print ((dp(h, w) - 1) + MOD) % MOD;
}
Compilation message
tents.cpp: In function 'void fast_scan(int&)':
tents.cpp:138:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
void fast_scan(int &x) { scanf("%d", &x); }
~~~~~^~~~~~~~~~
tents.cpp: In function 'void fast_scan(long long int&)':
tents.cpp:139:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
void fast_scan(long long &x) { scanf("%lld", &x); }
~~~~~^~~~~~~~~~~~
tents.cpp: In function 'void fast_scan(long long unsigned int&)':
tents.cpp:140:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
void fast_scan(unsigned long long &x) { scanf("%llu", &x); }
~~~~~^~~~~~~~~~~~
tents.cpp: In function 'void fast_scan(double&)':
tents.cpp:141:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
void fast_scan(double &x) { scanf("%lf", &x); }
~~~~~^~~~~~~~~~~
tents.cpp: In function 'void fast_scan(long double&)':
tents.cpp:142:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
void fast_scan(long double &x) { scanf("%Lf", &x); }
~~~~~^~~~~~~~~~~
tents.cpp: In function 'void fast_scan(char&)':
tents.cpp:144:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%c", &x);
~~~~~^~~~~~~~~~
tents.cpp: In function 'void fast_scan(std::__cxx11::string&)':
tents.cpp:150:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%s", string_in_buffer);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
512 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
3 ms |
512 KB |
Output is correct |
| 4 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 5 |
Correct |
3 ms |
640 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1408 KB |
Output is correct |
| 7 |
Correct |
3 ms |
768 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1536 KB |
Output is correct |
| 9 |
Correct |
3 ms |
896 KB |
Output is correct |
| 10 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 11 |
Correct |
2 ms |
384 KB |
Output is correct |
| 12 |
Correct |
5 ms |
2176 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
512 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
3 ms |
512 KB |
Output is correct |
| 4 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 5 |
Correct |
3 ms |
640 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1408 KB |
Output is correct |
| 7 |
Correct |
3 ms |
768 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1536 KB |
Output is correct |
| 9 |
Correct |
3 ms |
896 KB |
Output is correct |
| 10 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 11 |
Correct |
2 ms |
384 KB |
Output is correct |
| 12 |
Correct |
5 ms |
2176 KB |
Output is correct |
| 13 |
Correct |
2 ms |
384 KB |
Output is correct |
| 14 |
Correct |
12 ms |
9856 KB |
Output is correct |
| 15 |
Correct |
271 ms |
47452 KB |
Output is correct |
| 16 |
Correct |
5 ms |
1664 KB |
Output is correct |
| 17 |
Correct |
23 ms |
6912 KB |
Output is correct |
| 18 |
Correct |
55 ms |
13716 KB |
Output is correct |
| 19 |
Correct |
319 ms |
53496 KB |
Output is correct |
| 20 |
Correct |
249 ms |
42280 KB |
Output is correct |
| 21 |
Correct |
132 ms |
25680 KB |
Output is correct |
| 22 |
Correct |
138 ms |
30840 KB |
Output is correct |
| 23 |
Correct |
120 ms |
26488 KB |
Output is correct |
| 24 |
Correct |
369 ms |
59096 KB |
Output is correct |
| 25 |
Correct |
256 ms |
49288 KB |
Output is correct |
| 26 |
Correct |
327 ms |
54812 KB |
Output is correct |
| 27 |
Correct |
326 ms |
57152 KB |
Output is correct |
