Anonymní profil Stampl – Programujte.com

https://www.geeksforgeeks.org/print-a-given-matrix-in-spiral-form/ 

toto by malo pomoct :)

string str,sub; // str is string to search, sub is the substring to search for

vector<size_t> positions; // holds all the positions that sub occurs within str

size_t pos = str.find(sub, 0);
while(pos != string::npos)
{
    positions.push_back(pos);
    pos = str.find(sub,pos+1);
}

https://stackoverflow.com/questions/4034750/find-all-a-substrings-occurrences-and-locations