Compilare: main.cpp: In function 'int main()': main.cpp:52:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (lmax != s.size()) ~~~~~^~~~~~~~~~~ main.cpp:19:12: warning: variable 'poz' set but not used [-Wunused-but-set-variable] int n, poz, lmax = 0, first, last, i, j; ^~~