Compilare: main.cpp: In function 'int main()': main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[x].size(); i++) ~^~~~~~~~~~~~ main.cpp:24:9: warning: variable 'aux' set but not used [-Wunused-but-set-variable] int aux, mar; ^~~ main.cpp:24:14: warning: variable 'mar' set but not used [-Wunused-but-set-variable] int aux, mar; ^~~