#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});
int mn = 2e9;
vector <pll> ans2;
for (int j = 0;j < n;j++) {
vector <int> aa;
aa = a;
for (int i = 0;i < n;i++)
if (i != j) a[i]^=a[j];
unordered_map <int,int> mp;
bool YY = true;
for (int i = 0;i < n;i++)
{
if (mp[a[i]]) {YY = false;break;}
++mp[a[i]];
}
if (YY == false) {
a = aa;
continue;
}
ans.clear();
for (int i = 0;i < n;i++)
if (i != j) ans.pb({i + 1,j + 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]) {
pos = i;
break;
}
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]);
}
if (ans.size() < mn) {
mn = ans.size();
ans2 = ans;
}
a = aa;
}
ans = ans2;
}
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
xorsort.cpp: In function 'void solve()':
xorsort.cpp:56:14: warning: unused variable 'found' [-Wunused-variable]
56 | bool found = true;
| ^~~~~
xorsort.cpp:57:13: warning: unused variable 'mx' [-Wunused-variable]
57 | int mx = -1;
| ^~
xorsort.cpp:70:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
70 | if (ans.size() < mn) {
| ~~~~~~~~~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Not adjacent |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Not adjacent |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
364 KB |
Not adjacent |
| 2 |
Halted |
0 ms |
0 KB |
- |
