Submission #372881

#	Time	Username	Problem	Language	Result	Execution time	Memory
372881		Traduttore	Xor Sort (eJOI20_xorsort)	C++14	0 / 100	448 ms	18360 KiB

xorsort

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define pll pair <ll,ll>
#define F first
#define S second
#define int ll
#define pb push_back
#define IOS ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
using namespace std;
using namespace __gnu_pbds;
typedef tree <pll,null_type,less <pll>,rb_tree_tag,tree_order_statistics_node_update> orduk;
typedef tree <ll,null_type,less <ll>,rb_tree_tag,tree_order_statistics_node_update> orduk2;
ll n,type;
vector <ll> a;
inline void init() {
    cin>>n>>type;
    a.resize(n);
    for (int i = 0;i < n;i++)
        cin>>a[i];
}
vector <pll> ans;
inline void output() {
    cout<<ans.size()<<'\n';
    for (auto to:ans)
        cout<<to.F<<" "<<to.S<<'\n';
    exit(0);
}
inline void solve() {
	for (int i = 0;i < n - 1;i++)
	ans.pb({i + 1,i + 2});
	for (int i = 0;i < n - 1;i++)
	a[i]^=a[i + 1];
    while (1) {
        bool found = true;
        int mx = -1;
        int pos = -1;
        for (int i = 0;i < n - 1;i++)
        if (a[i] > a[i + 1]) {
        	mx = max(mx,a[i]);
        	if (mx == a[i]) pos = i;
        }
        if (pos < 0) break;
            ans.pb({pos + 2,pos + 1});
            ans.pb({pos + 1, pos + 2});
            ans.pb({pos + 2,pos + 1});
            swap(a[pos],a[pos + 1]);
    }
}

int32_t main() {
//freopen("input.txt","r",stdin);
//freopen("output.txt","w",stdout);
IOS;
int m;
m = 10;
m-=9;
while (m--)
{
    init();
    solve();
    output();
}
}
/*written by Traduttore*/
/*waiting for a miracle...*/

Compilation message (stderr)

xorsort.cpp: In function 'void solve()':
xorsort.cpp:37:14: warning: unused variable 'found' [-Wunused-variable]
   37 |         bool found = true;
      |              ^~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 35
• Subtask 3: 0 / 40