Compilare: main.cpp: In function 'bool posibil(int)': main.cpp:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[1].size();i++) ~^~~~~~~~~~~~ main.cpp:67:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[2].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~