Submission #465483

#	Time	Username	Problem	Language	Result	Execution time	Memory
465483		idas	Xor Sort (eJOI20_xorsort)	C++11	0 / 100	1 ms	204 KiB

xorsort

#include<bits/stdc++.h>
#define FOR(i, begin, end) for(int i=(begin); i<(end); i++)
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(nullptr)
#define PB push_back
#define F first
#define S second

const int INF=1e9;
const long long LINF=1e18;

using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef map<int, int> mii;

const int N=1e4+10;
int n, s, a[N];

int main()
{
    FAST_IO;
    cin >> n >> s;
    FOR(i, 0, n)
    {
        cin >> a[i];
    }

    vector<pii> ans;
    FOR(i, 1, n)
    {
        int xr=(a[i-1]^a[i]);
        if(xr<a[i]){
            a[i-1]=xr;
            ans.PB({i, i+1});
        }
        else{
            a[i]=xr;
            ans.PB({i+1, i});
        }
    }

    cout << ans.size() << '\n';
    for(auto[x, y] : ans){
        cout << x << " " << y << '\n';
    }
}

Compilation message (stderr)

xorsort.cpp: In function 'int main()':
xorsort.cpp:44:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   44 |     for(auto[x, y] : ans){
      |             ^

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