Bittijono

input/code.cpp: In function 'int main()':
input/code.cpp:140:25: warning: statement has no effect [-Wunused-value]
     if (res == "fail") 0;//cout << "Length of " << j << " failed!\n";
                         ^
input/code.cpp:122:6: warning: unused variable 'high' [-Wunused-variable]
  int high = len + 2;
      ^

#include <iostream>
#include <string>
#include <algorithm>

#define T 8

using namespace std;
int n;
string solution = "not found";
string chains[T] = {"101010101010101010101010101010101010101010101",
				   "110100100100010011010010010010010010010010010",
				   "111111111111111111111111111111111111111111111",
				   "100000100001000100100001000010000100001000010",
				   "100010001001011100111110111111011001111101111",
				   "100101000111010010110101001010010100011101001",
				   "110110101100101010101010010111011010110010101",
				   "101011010110100110010011010011010110101101001"};

int bounds[27] = {1, 3, 6, 11, 19, 32, 53, 87, 142, 231, 375, 608, 985, 1595, 2582, 4179,
              6763, 10944, 17709, 28655, 46366, 75023, 121391, 196416, 317809, 514227, 832038};

int numberOfDistinct(const string& str)
{
	int ones = 0;
	int zeros = 0;
	int distinct = 0;
	
	for (size_t i = 0; i < str.length(); i++)
	{
		char bit = str[i];
		bool isOne = bit == '1';
		
		int newSum = 1 + distinct;
		distinct = distinct - (isOne ? ones : zeros) + newSum;
		if (isOne) ones = newSum;
		else zeros = newSum;
	}
	
	return distinct;
}

int binSizeLowerBound(int n)
{
	for (int i = 26; i != 0; i--)
	{
		int bound = bounds[i];
		if (bound < n)
		{
			return i + 1;
		}
	}
	return 1;
}


string findBitstring(string b, int tries)
{
	size_t len = b.size();
	for (int test = 0; test < tries; test++)
	{
		int maxFitness = 123456879, fitIndex = -1;
		while (true)
		{
			bool foundImprovement = false;
			for (size_t i = 1; i < len; i++)
			{
				char bit = b[i];
				char rev = (bit == '1') ? '0' : '1';
				b[i] = rev;
				
				int distinctSubs = numberOfDistinct(b);
				//cout << b << " : " << distinctSubs << "\n";
				
				int fitness = abs(distinctSubs - n);
				if (fitness == 0)
				{
					// Solution found.
					return b;
				}
				if (fitness < maxFitness)
				{
					maxFitness = fitness;
					fitIndex = (int)i;
					foundImprovement = true;
				}
				
				b[i] = bit;
			}
			
			if (foundImprovement) b[fitIndex] = (b[fitIndex] == '1') ? '0' : '1';
			else
			{
				//cout << "No improvement found :-( shuffling\n";
				if (test < T) b = chains[test].substr(0, len);
				else random_shuffle(b.begin() + 1, b.end());
				break;
			}
		}
	}
	return "fail";
}


int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	/*
	long n;
	cin >> n;*/
	//int base = (int)log2(n);
	
	//cout << base << "\n";
	cin >> n;
	bool found = false;
	string s = "10101010101010101010101010101010101010101010";
	
	
	int len = binSizeLowerBound(n);
	int low = len + 1;
	int high = len + 2;
	
	for (int i = 0; i < 27; i++)
		if (bounds[i] == n) found = true;
	
	bool foundAns = false;
	if (n == 1) cout << "1";
	else if (found) cout << s.substr(0, low);
	else
	{
		for (int i = 0; i < 1; i++)
		{
			string chain = s;
			
			for (int j = low; j < 33; j++)
			{
				string sub = chain.substr(0, j);
				string res = findBitstring(sub, 15000);
				if (res == "fail") 0;//cout << "Length of " << j << " failed!\n";
				else
				{
					// Found an answer....
					cout << res << "\n";
					foundAns = true;
					break;
				}
			}
			
			if (foundAns) break;
		}
	}
	
	/*
	cout << findBitstring("010101010100000001010101010", 832038, 1000) << "\n";
	cout << findBitstring("100010001000100010001000100", 832038, 1000) << "\n";
	cout << findBitstring("010101010100000001010101010", 832038, 1000) << "\n";
	cout << findBitstring("010101010100000001010101010", 832038, 1000) << "\n";*/

	
	//cout << m << "\n";
	//cout << numberOfDistinct(str) << "\n";
	
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 1

Verdict: ACCEPTED

Test 9

Group: 1

Verdict: ACCEPTED

Test 10

Group: 1

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED

Test 15

Group: 2

Verdict: ACCEPTED

Test 16

Group: 2

Verdict: ACCEPTED

Test 17

Group: 2

Verdict: ACCEPTED

Test 18

Group: 2

Verdict: ACCEPTED

Test 19

Group: 2

Verdict: ACCEPTED

Test 20

Group: 2

Verdict: ACCEPTED

Test 21

Group: 3

Verdict: ACCEPTED

Test 22

Group: 3

Verdict: ACCEPTED

Test 23

Group: 3

Verdict: ACCEPTED

Test 24

Group: 3

Verdict: ACCEPTED

Test 25

Group: 3

Verdict: ACCEPTED

Test 26

Group: 3

Verdict: ACCEPTED

Test 27

Group: 3

Verdict: ACCEPTED

Test 28

Group: 3

Verdict: ACCEPTED

Test 29

Group: 3

Verdict: ACCEPTED

Test 30

Group: 3

Verdict: ACCEPTED

Test 31

Group: 4

Verdict: ACCEPTED

Test 32

Group: 4

Verdict: ACCEPTED

Test 33

Group: 4

Verdict: ACCEPTED

Test 34

Group: 4

Verdict: WRONG ANSWER

Test 35

Group: 4

Verdict: ACCEPTED

Test 36

Group: 4

Verdict: ACCEPTED

Test 37

Group: 4

Verdict: ACCEPTED

Test 38

Group: 4

Verdict: ACCEPTED

Test 39

Group: 4

Verdict: ACCEPTED

Test 40

Group: 4

Verdict: ACCEPTED