Compilare: user.cpp: In function ‘int main()’: user.cpp:32:34: warning: statement has no effect [-Wunused-value] m[cv[j]][cv[j-1]]==1; ~~~~~~~~~~~~~~~~~^~~ user.cpp:33:34: warning: statement has no effect [-Wunused-value] m[cv[j-1]][cv[j]]==1; ~~~~~~~~~~~~~~~~~^~~ user.cpp:45:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<e[0].size();i++) ~^~~~~~~~~~~~ user.cpp:48:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<e[1].size();i++) ~^~~~~~~~~~~~