Compilare: user.cpp: In function ‘int main()’: user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<V[1].size();++i) ^ user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[i].size();++j) ^ user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[i-1].size();++j) ^ user.cpp:59:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[i].size();++j) ^ user.cpp:65:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<V[m].size();++i) ^