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Submission #1025340

# Submission time Handle Problem Language Result Execution time Memory
1025340 2024-07-16T22:19:36 Z tolbi Xor Sort (eJOI20_xorsort) C++17
40 / 100
 41 ms 1120 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n,s;cin>>n>>s;
	vector<int> arr(n);
	for (int i = 0; i < n; ++i)
	{
		cin>>arr[i];
	}
	vector<pair<int,int>> ansarr;
	for (int bit = 19; bit >= 0; bit--){
		for (int i = 0; i+1 < n; i++){
			if (arr[i]&(1LL<<bit)){
				if (arr[i+1]&(1LL<<bit)){
					ansarr.push_back({i+1,i+2});
					arr[i]^=arr[i+1];
				}
				else {
					ansarr.push_back({i+2,i+1});
					ansarr.push_back({i+1,i+2});
					arr[i+1]^=arr[i];
					arr[i]^=arr[i+1];
				}
			}
		}
		if (n>1 && arr[n-1]&(1LL<<bit)){
			n--;
		}
	}
	cout<<ansarr.size()<<endl;
	for (int i = 0; i < ansarr.size(); ++i)
	{
		cout<<ansarr[i].first<<" "<<ansarr[i].second<<endl;
	}
}

Compilation message

xorsort.cpp: In function 'int main()':
xorsort.cpp:34:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |  for (int i = 0; i < ansarr.size(); ++i)
      |                  ~~^~~~~~~~~~~~~~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Incorrect 2 ms 344 KB Not sorted
4 Halted 0 ms 0 KB -

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Incorrect 2 ms 344 KB Not sorted
4 Halted 0 ms 0 KB -

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 456 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 6 ms 604 KB Output is correct
5 Correct 32 ms 872 KB Output is correct
6 Correct 31 ms 988 KB Output is correct
7 Correct 30 ms 1056 KB Output is correct
8 Correct 31 ms 1064 KB Output is correct
9 Correct 31 ms 980 KB Output is correct
10 Correct 31 ms 984 KB Output is correct
11 Correct 32 ms 956 KB Output is correct
12 Correct 33 ms 1024 KB Output is correct
13 Correct 33 ms 988 KB Output is correct
14 Correct 33 ms 1112 KB Output is correct
15 Correct 41 ms 1120 KB Output is correct