#include <bits/stdc++.h>
using namespace std;
const int mx=2000;
typedef long long ll;
int n,m;
int st,en;
//(i,x,state);
map<int,int>mp;
int dp[mx][mx][3];
int solve(int i,int x,int dir){
if(i==en){
if(x==n){
return 1;}
return 0;
}
// int &ret=dp[i][x][dir];
// if(ret!=-1){return ret;}
int ret=0;
if(dir==0){
for(int j=i+1;j<=n;j++){
if(mp[j]){continue;}
mp[j]=1;
ret+=solve(j,x+1,dir^1);
mp[j]=0;
}
}else{
for(int j=i-1;j>=1;j--){
if(mp[j]){continue;}
mp[j]=1;
ret+=solve(j,x+1,dir^1);
mp[j]=0;
}
}return ret;
}
int main() {
cin>>n>>st>>en;
//memset(dp,-1,sizeof(dp));
//cout<<dp[0][0][0];
mp[st]=1;
cout<<solve(st,1,0)+solve(st,1,1);
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
256 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
256 KB |
Output is correct |
3 |
Execution timed out |
2091 ms |
256 KB |
Time limit exceeded |
4 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
256 KB |
Output is correct |
3 |
Execution timed out |
2091 ms |
256 KB |
Time limit exceeded |
4 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
256 KB |
Output is correct |
3 |
Execution timed out |
2091 ms |
256 KB |
Time limit exceeded |
4 |
Halted |
0 ms |
0 KB |
- |