oj.uz

Submission #861289

# Submission time Handle Problem Language Result Execution time Memory
861289 2023-10-15T19:46:08 Z Ahmed57 Cat (info1cup19_cat) C++17
31 / 100
 686 ms 38868 KB 
#include <bits/stdc++.h>

using namespace std;
vector<pair<int,int>> con;
bool vis[200001];int arr[200001];
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    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 it = 0;it<30;it++){
        for(int i = 1;i<=n;i++){
            if(arr[i]!=i){
                con.push_back({arr[i],i});
                int tmp = arr[n-i+1];
                swap(arr[i],arr[arr[i]]);
                swap(arr[n-i+1],arr[tmp]);
            }
        }
        }
        cout<<con.size()<<" "<<con.size()<<"\n";
        for(auto i:con)cout<<i.first<<" "<<i.second<<"\n";
    }
}

Compilation message

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

Subtask #1
2.25 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 856 KB Correctly distinguished between possibility and impossibility

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 604 KB Output is correct
2 Correct 17 ms 604 KB Output is correct

Subtask #3
3.75 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 856 KB Correctly distinguished between possibility and impossibility
2 Correct 18 ms 604 KB Output is correct
3 Correct 17 ms 604 KB Output is correct
4 Correct 103 ms 4648 KB Correctly distinguished between possibility and impossibility
5 Correct 32 ms 1868 KB Correctly distinguished between possibility and impossibility
6 Correct 30 ms 1624 KB Correctly distinguished between possibility and impossibility

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 604 KB Output is correct
2 Correct 17 ms 604 KB Output is correct
3 Correct 341 ms 13524 KB Output is correct
4 Correct 323 ms 12264 KB Output is correct
5 Correct 365 ms 15340 KB Output is correct

Subtask #5
0.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 856 KB Correctly distinguished between possibility and impossibility
2 Correct 18 ms 604 KB Output is correct
3 Correct 17 ms 604 KB Output is correct
4 Correct 103 ms 4648 KB Correctly distinguished between possibility and impossibility
5 Correct 32 ms 1868 KB Correctly distinguished between possibility and impossibility
6 Correct 30 ms 1624 KB Correctly distinguished between possibility and impossibility
7 Correct 341 ms 13524 KB Output is correct
8 Correct 323 ms 12264 KB Output is correct
9 Correct 365 ms 15340 KB Output is correct
10 Incorrect 686 ms 38868 KB Number of operations limit exceeded
11 Halted 0 ms 0 KB -