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Submission #467115

# Submission time Handle Problem Language Result Execution time Memory
467115 2021-08-21T18:01:38 Z TlenekWodoru Xor Sort (eJOI20_xorsort) C++14
60 / 100
 1000 ms 12596 KB 
#include <bits/stdc++.h>
using namespace std;
int tab[1009];
bool zaj[2000000];
vector<pair<int,int>>odp;
int xorr(int a, int b)
{
    int u=1;
    int wynik=0;
    while(a>0||b>0)
    {
        if(a%2!=b%2)
        {
            wynik+=u;
        }
        a=a/2;
        b=b/2;
        u=u*2;
    }
    return wynik;
}
void swap_true(int a, int b)
{
    tab[a]=xorr(tab[a],tab[b]);
}
void swapp(int a, int b)
{
    /**swap_true(a,b);
    swap_true(b,a);
    swap_true(a,b);**/
    odp.push_back({a,b});
    odp.push_back({b,a});
    odp.push_back({a,b});
    swap(tab[a],tab[b]);
}
int main()
{ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    srand(time(0));
    int n,s;cin>>n>>s;
    for(int i=1;i<=n;i++)
    {
        cin>>tab[i];
        zaj[tab[i]]=1;
    } 
    for(int i=1;i<=n*4;i++)  
    {
        int a=(rand()%n)+1;
        int b=rand()%2;
        if(a==1||(b%2==1&&a!=n))
        {
            if(tab[a]>tab[a+1])
            {
                if(s==2||zaj[xorr(tab[a],tab[a+1])]==0)
                {
                    odp.push_back({a,a+1});
                    zaj[tab[a]]=0;
                    swap_true(a,a+1);
                    zaj[tab[a]]=1;
                } 
            }
        }
        else
        {
            if(tab[a]>tab[a-1])
            {
                if(s==2||zaj[xorr(tab[a],tab[a-1])]==0)
                {
                    odp.push_back({a,a-1});
                    zaj[tab[a]]=0;
                    swap_true(a,a-1);
                    zaj[tab[a]]=1;
                }
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        int minn=2000000000;
        int ind=-1;
        for(int j=i;j<=n;j++)
        {
            if(tab[j]<minn)
            {
                minn=tab[j];
                ind=j;
            }
        }
        for(int j=ind;j-1>=i;j--)
        {
            swapp(j,j-1);
        }
    }
    cout<<odp.size()<<endl;
    for(int i=0;i<odp.size();i++)
    {
        cout<<odp[i].first<<" "<<odp[i].second<<endl;
    }
    /**for(int i=1;i<=n;i++)
    {
        cout<<tab[i]<<endl;
    }**/
    return 0;
}

Compilation message

xorsort.cpp: In function 'int main()':
xorsort.cpp:94:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |     for(int i=0;i<odp.size();i++)
      |                 ~^~~~~~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 28 ms 1408 KB Output is correct
5 Correct 30 ms 1372 KB Output is correct
6 Correct 33 ms 1344 KB Output is correct
7 Correct 28 ms 1328 KB Output is correct
8 Correct 27 ms 1356 KB Output is correct
9 Correct 31 ms 1360 KB Output is correct
10 Correct 29 ms 1360 KB Output is correct
11 Correct 24 ms 1204 KB Output is correct
12 Correct 35 ms 1320 KB Output is correct
13 Correct 35 ms 1228 KB Output is correct
14 Correct 35 ms 1360 KB Output is correct
15 Correct 34 ms 1280 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 28 ms 1408 KB Output is correct
5 Correct 30 ms 1372 KB Output is correct
6 Correct 33 ms 1344 KB Output is correct
7 Correct 28 ms 1328 KB Output is correct
8 Correct 27 ms 1356 KB Output is correct
9 Correct 31 ms 1360 KB Output is correct
10 Correct 29 ms 1360 KB Output is correct
11 Correct 24 ms 1204 KB Output is correct
12 Correct 35 ms 1320 KB Output is correct
13 Correct 35 ms 1228 KB Output is correct
14 Correct 35 ms 1360 KB Output is correct
15 Correct 34 ms 1280 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 31 ms 1360 KB Output is correct
18 Correct 52 ms 1636 KB Output is correct
19 Correct 49 ms 1732 KB Output is correct
20 Correct 54 ms 1660 KB Output is correct
21 Correct 50 ms 1708 KB Output is correct
22 Correct 52 ms 1680 KB Output is correct
23 Correct 52 ms 1736 KB Output is correct
24 Correct 51 ms 1756 KB Output is correct
25 Correct 51 ms 1616 KB Output is correct
26 Correct 68 ms 1808 KB Output is correct
27 Correct 63 ms 1716 KB Output is correct
28 Correct 65 ms 1640 KB Output is correct
29 Correct 66 ms 1616 KB Output is correct
30 Correct 62 ms 1616 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 5 ms 716 KB Output is correct
4 Correct 49 ms 1664 KB Output is correct
5 Execution timed out 1088 ms 12596 KB Time limit exceeded
6 Halted 0 ms 0 KB -