oj.uz

Submission #880748

# Submission time Handle Problem Language Result Execution time Memory
880748 2023-11-30T01:22:27 Z cpptowin Tents (JOI18_tents) C++17
100 / 100
 163 ms 197344 KB 
#include<bits/stdc++.h>
#define fo(i,d,c) for(int i=d;i<=c;i++)
#define fod(i,c,d) for(int i=c;i>=d;i--)
#define maxn 1000010
#define N 5010
#define fi first
#define se second
#define pb emplace_back
#define en cout<<"\n";
#define int long long
#define inf 1000000000
#define pii pair<int,int>
#define vii vector<pii>
#define lb(x) x&-x
#define bit(i,j) ((i>>j)&1)
#define offbit(i,j) (i^(1<<j))
#define onbit(i,j) (i|(1<<j))
#define vi vector<int>
template <typename T1, typename T2> bool minimize(T1 &a, T2 b){if (a > b) {a = b; return true;} return false;}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b){if (a < b) {a = b; return true;} return false;}
using namespace std;
const int mod = 1e9 + 7;
int dp[N][N];
int DP(int n,int m,bool ok)
{
    if(dp[n][m] != -1) return dp[n][m];
    int &now = dp[n][m];
    if(n < 1 or m < 1) {
        now = ok;
        return now;
    }
    now = 0;
    now = (now + DP(n - 1,m,ok)) % mod;
    now = (now + 4 * m * DP(n - 1,m - 1,1)) % mod;
    now = (now + m * (m - 1) / 2 * DP(n - 1,m - 2,1)) % mod;
    now = (now + m * (n - 1) * DP(n - 2,m - 1,1)) % mod;
    return now;
}
int n,m;
main()
{
    #define name "TASK"
    if(fopen(name".inp","r"))
    {
       freopen(name".inp","r",stdin);
       freopen(name".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    cin >> n >> m;
    memset(dp,-1,sizeof dp);
    // dp[0][0] = 1;
    cout << DP(n,m,0);
}

Compilation message

tents.cpp:40:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   40 | main()
      | ^~~~
tents.cpp: In function 'int main()':
tents.cpp:45:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |        freopen(name".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tents.cpp:46:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |        freopen(name".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 196696 KB Output is correct
2 Correct 24 ms 196824 KB Output is correct
3 Correct 23 ms 196700 KB Output is correct
4 Correct 23 ms 196700 KB Output is correct
5 Correct 24 ms 196768 KB Output is correct
6 Correct 24 ms 196688 KB Output is correct
7 Correct 25 ms 196692 KB Output is correct
8 Correct 23 ms 196700 KB Output is correct
9 Correct 23 ms 196688 KB Output is correct
10 Correct 28 ms 196952 KB Output is correct
11 Correct 25 ms 196696 KB Output is correct
12 Correct 26 ms 196696 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 196696 KB Output is correct
2 Correct 24 ms 196824 KB Output is correct
3 Correct 23 ms 196700 KB Output is correct
4 Correct 23 ms 196700 KB Output is correct
5 Correct 24 ms 196768 KB Output is correct
6 Correct 24 ms 196688 KB Output is correct
7 Correct 25 ms 196692 KB Output is correct
8 Correct 23 ms 196700 KB Output is correct
9 Correct 23 ms 196688 KB Output is correct
10 Correct 28 ms 196952 KB Output is correct
11 Correct 25 ms 196696 KB Output is correct
12 Correct 26 ms 196696 KB Output is correct
13 Correct 24 ms 196696 KB Output is correct
14 Correct 23 ms 196948 KB Output is correct
15 Correct 116 ms 196956 KB Output is correct
16 Correct 27 ms 196688 KB Output is correct
17 Correct 32 ms 196956 KB Output is correct
18 Correct 45 ms 197204 KB Output is correct
19 Correct 133 ms 196956 KB Output is correct
20 Correct 105 ms 197100 KB Output is correct
21 Correct 70 ms 196956 KB Output is correct
22 Correct 75 ms 196956 KB Output is correct
23 Correct 50 ms 196956 KB Output is correct
24 Correct 163 ms 196956 KB Output is correct
25 Correct 125 ms 197344 KB Output is correct
26 Correct 145 ms 196956 KB Output is correct
27 Correct 157 ms 197136 KB Output is correct