Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:49:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:75:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < M[p].size(); ++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:93:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < M[x].size(); ++i) ^