Compilare: user.cpp: In function ‘void ceva2(int)’: user.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b[x].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void ceva1(int)’: user.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[x].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<q2[i].size();j++) ~^~~~~~~~~~~~~