Compilare: main.cpp: In function 'int main()': main.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1, k = 0; i < s.length(); ++i) { ~~^~~~~~~~~~~~ main.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = szS + 1; i < s.length(); ++i) { ~~^~~~~~~~~~~~