Submission #859472

#	Time	Username	Problem	Language	Result	Execution time	Memory
859472		naneosmic	Kangaroo (CEOI16_kangaroo)	C++14	0 / 100	0 ms	348 KiB

kangaroo

#include <bits/stdc++.h>
#define int long long
#define endl "\n"
using namespace std;
signed main(){
    int n,cs,cf;
    cin>>n>>cs>>cf;
    vector<int>arr(n);
    for(int i=0;i<n;i++)
        arr[i]=i+1;
        int ans=0;
    do{
        if(arr[0]!=cs)continue;
        if(arr[n-1]!=cf)continue;
        for(int i=1;i<n-1;i++){
            bool a1=arr[i]<arr[i-1];
            bool a2=arr[i]<arr[i+1];
            if(~(a1^a2))continue;
        }
        ans++;
    }while(next_permutation(arr.begin(),arr.end()));
    cout<<ans;
}

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