Submission #370815

#	Time	Username	Problem	Language	Result	Execution time	Memory
370815		sad	Cat (info1cup19_cat)	C++14	10 / 100	1095 ms	2704 KiB

cat

#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define fi first
#define se second
using namespace std;
vector<int>v,vv;int n;
vector<pair<int,int>>w;
int a[1000000];
int main()
{
    int t;cin>>t;
    while(t--)
    {
        int n;
        cin>>n;int re=0;
        for(int i=1;i<=n;i++)cin>>a[i];
        for(int i=1;i<=n;i++)
        {
            if(a[i]==i)continue;
            for(int j=i+1;j<=n;j++)
            {
                if(a[j]==i)
                {
                    re++;
                    w.pb({i,j});
                    swap(a[i],a[j]);
                    swap(a[n-i+1],a[n+1-j]);break;
                }
            }
        }
        for(int i=1;i<=n;i++)if(a[i]!=i)re=-1;
        if(re==-1)
        {
            cout<<-1<<endl;w.clear();continue;
        }
        cout<<0<<" "<<w.size()<<endl;
        for(auto it:w)
        if(it.fi==it.se)continue;
        else cout<<it.fi<<" "<<it.se<<endl;
        w.clear();
    }
}

• Subtask 1: 0 / 15
• Subtask 2: 10 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 15
• Subtask 5: 0 / 35