Compilare: main.cpp: In function 'int main()': main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<q.size(); i++) ~^~~~~~~~~ main.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<q.size(); i++) ~^~~~~~~~~ main.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<q.size(); j++) ~^~~~~~~~~