Compilare: user.cpp: In function ‘int main()’: user.cpp:271:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v1.size(); i++) ^ user.cpp:279:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v2.size(); i++) ^ user.cpp:291:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v1.size(); i++) ^ user.cpp:299:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v2.size(); i++) ^ user.cpp:148:26: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(retea[j][i] == -1) ^