Submission #1310916

#	Time	Username	Problem	Language	Result	Execution time	Memory
1310916		theiulius	Data Transfer (IOI19_transfer)	C++20	88 / 100	63 ms	1728 KiB

transfer

#include "transfer.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ll long long
#define ff first
#define ss second
#define pb push_back
using namespace std;

std::vector<int> get_attachment(std::vector<int> a) {
	vector<int> v;
	int n = a.size();
	for (int k = 7; k >= 0; k--){
		int i = 0;
		int ans = 0;
		while (i < n){		
			for (int j = i; j < min(n, i + (1 << k)); j++){
			    ans ^= a[j];
			}
			
			i += 2 * (1 << k);
		}
		v.pb(ans);
	}
	
	int ans = 0;
	for (int i = 0; i < n; i++){
		ans ^= a[i];
	}
	v.pb(ans);
//	for (auto h : v){
//		cout << h;
//	}
//	cout << endl;
	return v;
}

std::vector<int> retrieve(std::vector<int> a) {
	int n = a.size() - 9;
	int K = 9;
	int ans0 = 0;
	for (int i = 0; i < n; i++){
//		cout << a[i];
		ans0 ^= a[i];
	}
//	cout << endl;
	
	int l = 0, r = 255;
	for (int k = 7; k >= 0; k--){
		int i = 0;
		int ans = 0;
		while (i < n){	
			for (int j = i; j < min(n, i + (1 << k)); j++){
			    ans ^= a[j];
			}
			
			i += 2 * (1 << k);
		}
		
		if (a[n + (7 - k)] != ans){ // pirvel naxevarshia
			if (ans0 != a[n + K - 1]){ // n-shia corrupted
				r = (l + r) / 2;
			}else{
				a.resize(n);
				return a;
			}
		}else{ // meore naxevarshia
			if (ans0 != a[n + K - 1]){ // n-shia corrupted
				l = (l + r + 1) / 2;
			}
		}
	}
//	cout << l << " " << r << endl;
	if (ans0 != a[n + K - 1]){
		a[l] ^= 1;
	}
	
	a.resize(n);
	
	return a;
}

Compilation message (stderr)

grader.cpp: In instantiation of 'void shuffle(std::vector<T>&) [with T = Scenario]':
grader.cpp:200:10:   required from here
grader.cpp:28:23: warning: 'void std::random_shuffle(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Scenario*, vector<Scenario> >]' is deprecated: use 'std::shuffle' instead [-Wdeprecated-declarations]
   28 |         random_shuffle(v.begin(), v.end());
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:61,
                 from grader.cpp:8:
/usr/include/c++/13/bits/stl_algo.h:4581:5: note: declared here
 4581 |     random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~~~~~~~~~~~

• Subtask 1: 48 / 60
• Subtask 2: 40 / 40