Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i < c.length();++i) ~~^~~~~~~~~~~~ main.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (right < c.length() && c[right] == c[right - left]) ~~~~~~^~~~~~~~~~~~ main.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (right < c.length() && c[right] == c[right - left]) ~~~~~~^~~~~~~~~~~~ main.cpp:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = a.length();i < c.length();++i) ~~^~~~~~~~~~~~ main.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z[i] == a.length()) main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < sol.size();++i) ~~^~~~~~~~~~~~