Submission #882178

#	Time	Username	Problem	Language	Result	Execution time	Memory
882178		hasan2006	Tents (JOI18_tents)	C++17	0 / 100	65 ms	37468 KiB

tents

#include <bits/stdc++.h>

using namespace std;

#define TL ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define rall(s) s.rbegin(),s.rend()
#define all(s) s.begin(),s.end()
#define pb push_back
#define se second
#define fi first
#define ll long long
#define ld long double
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define yes cout<<"yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define no cout<<"no\n"


const int N = 3e3 + 9 , mod = 1e9 + 7;
ll   a[N] = {}, b[N] , c[N] , d[N] , dp[N][N] , ans[N];

void add(ll &a, ll b){
    a += b;
    if(a >= mod)a %= mod;
}

void solve()
{
    ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      cin >> n >> m;
    for(i = 0; i <= m; i++)
        dp[0][i] = 1;
    for(int i = 0; i <= n; i++)
        dp[i][0] = 1;
    for(ll i = 1; i <= n; i++){
        for(ll j = 1; j <= m; j++){
            add(dp[i][j], dp[i - 1][j - 1] * j * 4);
            if(j >= 2){
                add(dp[i][j], dp[i - 1][j - 2] * j * (j - 1) / 2);
            }if(i >= 2){
                add(dp[i][j], dp[i - 2][j - 1] * j * (i - 1));
            }
        add(dp[i][j], dp[i - 1][j]);
        }
    }

    cout << (dp[n][m] - 1 + mod) % mod;
}

int main(){
    TL;
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
int t = 1;
//cin>>t;
while(t--)
     {
     solve();
     }
}
// Author : حسن

Compilation message (stderr)

tents.cpp: In function 'void solve()':
tents.cpp:31:8: warning: unused variable 'q' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |        ^
tents.cpp:31:16: warning: unused variable 'j' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                ^
tents.cpp:31:26: warning: unused variable 'z' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                          ^
tents.cpp:31:29: warning: unused variable 's' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                             ^
tents.cpp:31:37: warning: unused variable 'f' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                     ^
tents.cpp:31:40: warning: unused variable 'l' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                        ^
tents.cpp:31:44: warning: unused variable 'r' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                            ^
tents.cpp:31:48: warning: unused variable 'k' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                ^
tents.cpp:31:52: warning: unused variable 'x' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                    ^
tents.cpp:31:56: warning: unused variable 'y' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                        ^
tents.cpp:31:60: warning: unused variable 'mn' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                            ^~
tents.cpp:31:73: warning: unused variable 'mx' [-Wunused-variable]
   31 |     ll q , i , j , m ,n, z ,s = 0 , f, l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                                         ^~
tents.cpp: In function 'int main()':
tents.cpp:55:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
tents.cpp:56:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 48
• Subtask 2: 0 / 52