QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#771220 | #7778. Turning Permutation | jiangzhihui | WA | 0ms | 3888kb | C++14 | 1.8kb | 2024-11-22 10:53:59 | 2024-11-22 10:53:59 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=55;
ll dp[N][N][N][2],k;
int n;
ll g[N][N];
vector<int> val;
vector<int> getans(int len){
if(len==1){
return vector<int>(1,val[0]);
}
for(int i=1;i<=len;i++){
if(g[len][i]>=k){
vector<int> t;
t.push_back(val[i-1]);
val.erase(val.begin()+i-1);
vector<int> tmp=getans(len-1);
for(auto v:tmp){
t.push_back(v);
}
return t;
}else{
k-=g[len][i];
}
}
return vector<int>();
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n>>k;
dp[2][1][1][1]=1;
dp[2][2][2][0]=1;
for(int i=2;i<n;i++){
for(int j=1;j<=i;j++){
for(int k=1;k<=i;k++){
if(j==1&&k!=1)continue;
//1 before 2
for(int p=1;p<=k;p++){
if(p==1){
dp[i+1][1][1][1]+=dp[i][j][k][0];
}else{
dp[i+1][j+1][p][1]+=dp[i][j][k][0];
}
}
//1 after 2
for(int p=k;p<=i;p++){
dp[i+1][j+1][p+1][0]+=dp[i][j][k][1];
}
}
}
}
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
for(int k=1;k<=i;k++){
g[i][j]+=dp[i][j][k][0]+dp[i][j][k][1];
}
}
}
ll s=0;
for(int i=1;i<=n;i++){
val.push_back(i);
s+=g[n][i];
}
if(s<k){
cout<<-1<<endl;
return 0;
}
vector<int> ans=getans(n);
for(auto v:ans){
cout<<v<<" ";
}
cout<<endl;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3648kb
input:
3 2
output:
2 1 3
result:
ok 3 number(s): "2 1 3"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
3 5
output:
-1
result:
ok 1 number(s): "-1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3820kb
input:
4 6
output:
3 1 2 4
result:
ok 4 number(s): "3 1 2 4"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3624kb
input:
4 11
output:
-1
result:
ok 1 number(s): "-1"
Test #5:
score: -100
Wrong Answer
time: 0ms
memory: 3888kb
input:
3 1
output:
1 2 3
result:
wrong answer 2nd numbers differ - expected: '3', found: '2'