Compilare: user.cpp: In function ‘int main()’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j1=0;j1<v[i].size();j1++) ^ user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j2=j1+1;j2<v[i].size();j2++) ^ user.cpp:48:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j1=0;j1<v[SM].size();++j1) ^ user.cpp:49:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j2=j1+1;j2<v[SM].size();++j2) ^