oj.uz

Submission #370844

# Submission time Handle Problem Language Result Execution time Memory
370844 2021-02-24T18:30:39 Z farhan132 Tents (JOI18_tents) C++17
100 / 100
 466 ms 71404 KB 
/***Farhan132***/

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef double dd;
typedef vector<ll> vll;
typedef pair<ll , ll> ii;
typedef vector< ii > vii;
typedef pair < ll , pair < ll , ll > > cm; 
 
#define ff first
#define ss second
#define pb push_back
#define in insert
#define f0(b) for(int i=0;i<(b);i++)
#define f00(b) for(int j=0;j<(b);j++)
#define f1(b) for(int i=1;i<=(b);i++)
#define f11(b) for(int j=1;j<=(b);j++)
#define f2(a,b) for(int i=(a);i<=(b);i++)
#define f22(a,b) for(int j=(a);j<=(b);j++)
#define sf(a) scanf("%lld",&a)
#define sff(a,b) scanf("%lld %lld", &a , &b)
#define pf(a) printf("%lld\n",a)
#define pff(a,b) printf("%lld %lld\n", a , b)
#define PI 3.14159265359
#define bug printf("**!\n")
#define mem(a , b) memset(a, b ,sizeof(a))
#define front_zero(n) __builtin_clzll(n)
#define back_zero(n) __builtin_ctzll(n)
#define total_one(n) __builtin_popcountll(n)
#define clean fflush(stdout)

const ll mod =  (ll)1e9 + 7;
const ll maxn = (ll)2e5 + 5;
const int nnn = 1048590;
const int inf = numeric_limits<int>::max()-1;
//const ll INF = numeric_limits<ll>::max()-1;
//const ll INF = 1e18;
 
ll dx[]={0,1,0,-1};
ll dy[]={1,0,-1,0};
ll dxx[]={0,1,0,-1,1,1,-1,-1};
ll dyy[]={1,0,-1,0,1,-1,1,-1};

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

const ll N = 3005;

ll dp[N][N];

ll DP(ll x, ll y){

  if(min(x,y) == 0) return 1;
  ll &ret = dp[x][y];
  if(ret != -1) return ret;
  ret = ((y) * 4 * DP(x-1, y-1) )%mod;
  if(y >= 2) ret = (ret + ((y)*(y-1))/2 * DP(x-1, y-2))%mod;
  if(x >= 2 && y >= 1) ret = (ret + DP(x-2, y-1)*((x-1))*y )%mod;
  ret = ret + DP(x-1, y);
  return ret % mod;
}

void solve(){
  mem(dp, -1);
  ll n , m;
  cin >> n >> m;
  cout << (DP(n , m) + mod - 1) % mod;
  
  return;
}

 
int main() {
    
    
    #ifdef LOCAL
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    #else 
     //   freopen("cbarn2.in", "r", stdin);
     //   freopen("cbarn2.out", "w", stdout);
      ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
    #endif
    //cout << fixed << setprecision(10);
   // work();
    //  mem(b,0);
    ll T;
    T=1;
    //cin >> T; 
    //scanf("%lld",&T);
   // ll CT = 0;
    //work();
    while(T--){
        //cout << "Case " << ++CT <<": " ;
        //printf("Case %lld: ",++CT);
        solve();
    }
 
    return 0;
}

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 70972 KB Output is correct
2 Correct 37 ms 71020 KB Output is correct
3 Correct 37 ms 71020 KB Output is correct
4 Correct 38 ms 71020 KB Output is correct
5 Correct 42 ms 71020 KB Output is correct
6 Correct 38 ms 71020 KB Output is correct
7 Correct 37 ms 71020 KB Output is correct
8 Correct 38 ms 71020 KB Output is correct
9 Correct 36 ms 71020 KB Output is correct
10 Correct 44 ms 71020 KB Output is correct
11 Correct 36 ms 71020 KB Output is correct
12 Correct 46 ms 71040 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 70972 KB Output is correct
2 Correct 37 ms 71020 KB Output is correct
3 Correct 37 ms 71020 KB Output is correct
4 Correct 38 ms 71020 KB Output is correct
5 Correct 42 ms 71020 KB Output is correct
6 Correct 38 ms 71020 KB Output is correct
7 Correct 37 ms 71020 KB Output is correct
8 Correct 38 ms 71020 KB Output is correct
9 Correct 36 ms 71020 KB Output is correct
10 Correct 44 ms 71020 KB Output is correct
11 Correct 36 ms 71020 KB Output is correct
12 Correct 46 ms 71040 KB Output is correct
13 Correct 39 ms 71148 KB Output is correct
14 Correct 36 ms 71148 KB Output is correct
15 Correct 316 ms 71300 KB Output is correct
16 Correct 38 ms 71020 KB Output is correct
17 Correct 56 ms 71020 KB Output is correct
18 Correct 87 ms 71148 KB Output is correct
19 Correct 364 ms 71308 KB Output is correct
20 Correct 276 ms 71276 KB Output is correct
21 Correct 166 ms 71148 KB Output is correct
22 Correct 192 ms 71276 KB Output is correct
23 Correct 149 ms 71276 KB Output is correct
24 Correct 466 ms 71404 KB Output is correct
25 Correct 345 ms 71276 KB Output is correct
26 Correct 397 ms 71404 KB Output is correct
27 Correct 450 ms 71404 KB Output is correct