Compilare: main.cpp: In function 'int main()': main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (lmax == s.size()) ~~~~~^~~~~~~~~~~ main.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (lmax == s.size() and l[i] == lmax) ~~~~~^~~~~~~~~~~ main.cpp:81:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (lmax != s.size()) ~~~~~^~~~~~~~~~~ main.cpp:19:12: warning: unused variable 'poz' [-Wunused-variable] int n, poz, lmax = 0, first, last, i, j; ^~~