oj.uz

Submission #861275

# Submission time Handle Problem Language Result Execution time Memory
861275 2023-10-15T19:03:55 Z Ahmed57 Cat (info1cup19_cat) C++17
16 / 100
 1000 ms 7496 KB 
#include <bits/stdc++.h>

using namespace std;
vector<pair<int,int>> con;
int vis[200001],arr[200001];
void dfs(int i,int st){
    if(st!=i)con.push_back({st,i});
    vis[i] = 1;
    if(vis[arr[i]]==0)dfs(arr[i],st);
}
int main(){
    int t;cin>>t;
    z:while(t--){
        int n;cin>>n;
        for(int i = 1;i<=n;i++)vis[i] = 0;
        con.clear();
        int pos[n+1];
        for(int i = 1;i<=n;i++){
            cin>>arr[i];pos[arr[i]] = i;
        }
        int g = 0;int lol = 0;
        for(int i = 1;i<=n/2;i++){
            if(arr[i]!=i)g++;
            if(n-arr[i]+1!=arr[n-i+1]){
                cout<<-1<<endl;
                goto z;
            }if(arr[i]>n/2){
                lol++;
            }
        }
        if(lol&1){
            cout<<-1<<endl;
            goto z;
        }
        for(int i = 1;i<=n/2;i++){
            if(!vis[i])dfs(i,i);
        }
        cout<<con.size()<<" "<<con.size()<<endl;
        for(auto i:con)cout<<i.first<<" "<<i.second<<endl;
    }
}

Compilation message

cat.cpp: In function 'int main()':
cat.cpp:17:13: warning: variable 'pos' set but not used [-Wunused-but-set-variable]
   17 |         int pos[n+1];
      |             ^~~

Subtask #1
2.25 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 344 KB Correctly distinguished between possibility and impossibility

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 596 KB Output is correct
2 Correct 73 ms 512 KB Output is correct

Subtask #3
3.75 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 344 KB Correctly distinguished between possibility and impossibility
2 Correct 75 ms 596 KB Output is correct
3 Correct 73 ms 512 KB Output is correct
4 Correct 140 ms 916 KB Correctly distinguished between possibility and impossibility
5 Correct 46 ms 596 KB Correctly distinguished between possibility and impossibility
6 Correct 38 ms 348 KB Correctly distinguished between possibility and impossibility

Subtask #4
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 596 KB Output is correct
2 Correct 73 ms 512 KB Output is correct
3 Execution timed out 1061 ms 7496 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 344 KB Correctly distinguished between possibility and impossibility
2 Correct 75 ms 596 KB Output is correct
3 Correct 73 ms 512 KB Output is correct
4 Correct 140 ms 916 KB Correctly distinguished between possibility and impossibility
5 Correct 46 ms 596 KB Correctly distinguished between possibility and impossibility
6 Correct 38 ms 348 KB Correctly distinguished between possibility and impossibility
7 Execution timed out 1061 ms 7496 KB Time limit exceeded
8 Halted 0 ms 0 KB -