제출 #1118048

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1118048		vjudge1	캥거루 (CEOI16_kangaroo)	C++17	0 / 100	1 ms	336 KiB

kangaroo

//Desinged by AzeTurk810 Open source
#include <bits/stdc++.h>
using namespace std;

# define ull unsigned long long
# define hurryup ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
# define endl '\n'
# define pb push_back
# define INF 1e10
# define vbol vector<bool>
# define vint vector<int>
# define ll long long
# define int long long
# define mod 1000000007

signed main()
{
    int n,cs,cf,fixed = 0;
    cin>>n>>cs>>cf;
    vector<vector<int>>dp (n + 1,vector<int>(n + 1,0));
    dp[1][1] = 1;
    for(int i=1;i<=n;i++)
    {
   		if(cs == i || cf == i) fixed++;
    	for(int j=1;j<=n;j++)
    	{
    		if(cs == i || cf == i)
    		{
    			dp[i][j + 1] += dp[i - 1][j]%mod;
    			dp[i][j] += (dp[i - 1][j])%mod;
    		}
    		else
    		{
    			dp[i][j + 1] += (dp[i - 1][ j ] * (j-fixed + 1))%mod;
    			dp[i][ j -1] +=( dp[i -1 ][j] *(j - fixed + 1))%mod;
    		}
    		
    	}
    }
    cout<<dp[n][1]<<endl;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 30
• Subtask 3: 0 / 15
• Subtask 4: 0 / 49