Submission #826704

#	Time	Username	Problem	Language	Result	Execution time	Memory
826704		ZeroCool	Xor Sort (eJOI20_xorsort)	C++14	25 / 100	819 ms	18532 KiB

xorsort

#include <bits/stdc++.h>
#define int long long
#define ll long long
#define ld long double
using namespace std;
 
const int mxn = 1005;
const int SQRT = 500;
const int inf = 1e18;
const int mod = 998244353;
const ld eps = 1e-9;

vector<pair<int,int> > res;

int A[mxn];

void xswap(int a,int b){
	res.push_back({b,a});
	res.push_back({a,b});
	res.push_back({b,a});
	swap(A[a], A[b]);
	
}


void solve(int T){
	int n,s;
	cin>>n>>s;

	for(int i = 0;i<n;i++)cin>>A[i];

	while(2 + 2 == 4){
		bool found = false;
		for(int i = 0;i<n-1;i++){
			
			if(A[i] > A[i+1]){
				xswap(i, i+1);
				found = true;
			}
			
		}

		if(!found)break;
	}

	cout<<res.size()<<endl;
	for(auto p: res){
		cout<<p.first+1<<" "<<p.second+1<<endl;
	}

}
int32_t main(){
	#ifdef ONLINE_JUDGE
    ios::sync_with_stdio(false);
    cin.tie(0);
	#endif
	int t = 1;
	//cin>>t;

	for(int i = 1;i<=t;i++)solve(i);
    return 0;
}

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