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input/code.cpp: In function 'int main()':
input/code.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i <= target.size() - stamp.size(); i++)
                 ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.cpp:21:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = target.size() - 1; i >= stamp.size(); i--)
                                 ~~^~~~~~~~~~~~~~~
input/code.cpp:27:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i <= target.size() - stamp.size(); i++)
                 ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < stamp.size(); j++)
                  ~~^~~~~~~~~~~~~~
input/code.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < s...

#include <deque>
#include <iostream>
#include <map>
#include <string>

using namespace std;

int main()
{
	string target, stamp;
	cin >> target >> stamp;

	deque<int> order1, order2, order3, order4;

	for(int i = 0; i <= target.size() - stamp.size(); i++)
	{
		if(stamp[0] == target[i])
			order1.push_back(i);
	}

	for(int i = target.size() - 1; i >= stamp.size(); i--)
	{
		if(stamp[stamp.size() - 1] == target[i])
			order2.push_back(i - stamp.size() + 1);
	}

	for(int i = 0; i <= target.size() - stamp.size(); i++)
	{
		bool flag = true;
		for(int j = 0; j < stamp.size(); j++)
		{
			if(target[i+j] != stamp[j])
			{
				flag = false;
				break;
			}
		}

		if(flag)
			order3.push_back(i);
	}

	deque<int> order;
	for(int p : order1) order.push_back(p);
	for(int p : order2) order.push_back(p);
	for(int p : order3) order.push_back(p);


	string comp(target.size(), ' ');
	for(int p : order)
	{
		for(int i = 0; i < stamp.size(); i++)
			comp[p+i] = stamp[i];
	}

	//cout << comp << endl;
	if(comp != target)
	{
		cout << "-1" << endl;
		return 0;
	}
	
	cout << order.size() << endl;	
	for(int p : order)
		cout << p+1 << " ";
	cout << endl;
}

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: 1

Verdict: ACCEPTED

Test 12

Group: 1

Verdict: ACCEPTED

Test 13

Group: 1

Verdict: ACCEPTED

Test 14

Group: 1

Verdict: ACCEPTED

Test 15

Group: 2

Verdict: ACCEPTED

Test 16

Group: 2

Verdict: WRONG ANSWER

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: 2

Verdict: WRONG ANSWER

Test 22

Group: 2

Verdict: ACCEPTED

Test 23

Group: 2

Verdict: ACCEPTED

Test 24

Group: 2

Verdict: ACCEPTED

Test 25

Group: 2

Verdict: ACCEPTED

Test 26

Group: 2

Verdict: ACCEPTED

Test 27

Group: 2

Verdict: ACCEPTED

Test 28

Group: 2

Verdict: ACCEPTED

Test 29

Group: 3

Verdict: ACCEPTED

Test 30

Group: 3

Verdict: WRONG ANSWER

Test 31

Group: 3

Verdict: WRONG ANSWER

Test 32

Group: 3

Verdict: ACCEPTED

Test 33

Group: 3

Verdict: ACCEPTED

Test 34

Group: 3

Verdict: ACCEPTED

Test 35

Group: 3

Verdict: WRONG ANSWER

Test 36

Group: 3

Verdict: WRONG ANSWER

Test 37

Group: 3

Verdict: ACCEPTED

Test 38

Group: 3

Verdict: ACCEPTED

Test 39

Group: 3

Verdict: ACCEPTED

Test 40

Group: 3

Verdict: ACCEPTED

Test 41

Group: 3

Verdict: ACCEPTED

Test 42

Group: 3

Verdict: ACCEPTED