Compilare: main.cpp: In function 'int main()': main.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) { ~~^~~~~~~~~~ main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz < min(v[i - 1].size(), v[i].size()) && v[i][poz] == v[i - 1][poz]) ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~