Submission #1090074

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090074		idk__	Xor Sort (eJOI20_xorsort)	C++14	0 / 100	0 ms	348 KiB

xorsort

#include <bits/stdc++.h>
using namespace std;
int a[1001], n, s;
vector<pair<int, int>>op;
void s1(){
    int b[n];
    for(int i = 0;i < n; i++)b[i] = a[i];
    for(int i = 0;i < n-1; i++)op.push_back({i, i+1});

    for(int i = n-1; i>=0; i--){
        int mxi = 0;
        for(int j = 0;j <= i; j++)if(b[j] > b[mxi])mxi = j;
        for(int j = mxi; j < i; j++)op.push_back({j+1, j});
        for(int j = mxi; j >=1; j--)op.push_back({j, j-1});
    }

}

void s2(){
    int r=n-1;
    for(int i = 19; i>=0; i--){
        bool flag = 0;

        int x=0;
        for(int j = 0;j < r; j++){
            
            int bt = (1 << i);

            if(a[j+1] > (1<<i))break;
            if((bt&a[j]) and !(bt&a[j+1]))op.push_back({j+1, j}), a[j+1]^=a[j], x+=10;
            if((bt&a[j]) and (bt&a[j+1]))op.push_back({j, j+1}), a[j]^=a[j+1],  x+=1000;
            

        }
       // for(int i = 0;i < n; i++)cout << a[i] << " ";
        //cout <<endl;
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> s;
    for(int i = 0;i < n; i++)cin >> a[i];

    if(s==1)s1();
    else s2();

    cout << op.size() << endl;
    for(auto [i, j] : op)cout << i+1 << " " << j+1 << endl;
    
   // for(int i = 0;i < n; i++)cout << a[i] << " ";

    
    
    }

Compilation message (stderr)

xorsort.cpp: In function 'void s2()':
xorsort.cpp:22:14: warning: unused variable 'flag' [-Wunused-variable]
   22 |         bool flag = 0;
      |              ^~~~
xorsort.cpp: In function 'int main()':
xorsort.cpp:51:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   51 |     for(auto [i, j] : op)cout << i+1 << " " << j+1 << endl;
      |              ^

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