Submission #1310894

#	Time	Username	Problem	Language	Result	Execution time	Memory
1310894		theiulius	Data Transfer (IOI19_transfer)	C++20	0 / 100	5 ms	1720 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 = 5; k >= 0; k--){
		int i = 0;
		int ans = 0;
		while (i < n){	
			int j = i;	
			for (j = i; j < i + (1 << k); j++){
				ans ^= a[j];
			}
			
			i = j + (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() - 7;
	int K = 7;
	int ans0 = 0;
	for (int i = 0; i < n; i++){
//		cout << a[i];
		ans0 ^= a[i];
	}
//	cout << endl;
	
	int l = 1, r = 63;
	int ans = 0;
	for (int k = 5; k >= 0; k--){
		int i = 0;
		int ans = 0;
		while (i < n){	
			int j = i;	
			for (j = i; j < i + (1 << k); j++){
//				cout << k << " " << j << endl;
				ans ^= a[j];
			}
			
			i = j + (1 << k);
		}
		
//		cout << l << " " << r << endl;
		if (a[n + (5 - k)] != ans){ // pirvel naxevarshia
			if (ans0 != a[n + K - 1]){ // n-shia corrupted
				r = (l + r - 1) / 2;
			}else{
				a[n + (5 - k)] ^= 1;
				return a;
			}
		}else{ // meore naxevarshia
			if (ans0 != a[n + K - 1]){ // n-shia corrupted
				l = (l + r + 1) / 2;
			}
		}
	}
//	cout << l << " " << r << endl;
	a[r] ^= 1;
	
	a.pop_back();
	a.pop_back();
	a.pop_back();
	a.pop_back();
	a.pop_back();
	a.pop_back();
	a.pop_back();
	
	return a;
	// 011001010110110110100111110011010111111111111000101011100101001
	// 011001010110110110100111110011010111111111111000101011100101001
}


//static inline string run_scenario() {
//	int c;
//	cin >> c;
//	if (c < -1)
//		return "invalid corruption index";
//	string source_str;
//	cin >> source_str;
//	const int N = source_str.size();
//	const int max_attachment_size = 2*N;
//	vector<int> source;
//	for (int i=0; i<N; i++)
//		source.push_back(source_str[i]-'0');
//
//	vector<int> attachment = get_attachment(source);
//	if (int(attachment.size()) > max_attachment_size)
//		return "attachment too large";
//	for (int x : attachment)
//		if (x != 0 && x != 1)
//			return "invalid attachment integer value";
//
//	vector<int> data(source);
//	data.insert(data.end(), attachment.begin(), attachment.end());
//
//	if (c >= int(data.size()))
//		return "invalid corruption index";
//
//	if (c >= 0)
//		data[c] = 1-data[c];
//
//	vector<int> result_source = retrieve(data);
//
////	for (int h : source){
////		cout << h;
////	}
////	cout << endl;
////	for (int h : result_source){
////		cout << h;
////	}
////	cout << endl;
//	if (source != result_source)
//		return "wrong source retrieval";
//
//	return string("OK K=")+to_string(attachment.size());
//}

//main() {
//	int T;
//	cin >> T;
//	for (int scenario = 0; scenario < T; scenario++) {
//		string result = run_scenario();
//		cout << "scenario #" << scenario << ": " << result << endl;
//	}
//	return 0;
//}

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: 0 / 60
• Subtask 2: 0 / 40