Compilare: main.cpp: In function 'int main()': main.cpp:18:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz!=-1) res.push_back(poz); ~~~^~~~ main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz==-1) break; ~~~^~~~