Compilare: main.cpp: In function 'bool augment(int)': main.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[n].size(); ++i) { ~^~~~~~~~~~~~ main.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[n].size(); ++i) { ~^~~~~~~~~~~~ main.cpp: In function 'void check(int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[n].size(); ++i) { ~^~~~~~~~~~~~ main.cpp: In function 'bool augment(int)': main.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^