Compilare: main.cpp: In function 'void inmulteste(matrix&, matrix&, matrix&)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<A.size(); i++) ~^~~~~~~~~ main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<B[0].size(); j++) ~^~~~~~~~~~~~ main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int o=0; o<B.size(); o++) ~^~~~~~~~~