Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++){ ^ user.cpp:14:9: warning: unused variable ‘c’ [-Wunused-variable] int c, nv; ^ user.cpp:14:12: warning: unused variable ‘nv’ [-Wunused-variable] int c, nv; ^ user.cpp: In function ‘int main()’: user.cpp:30:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, n, m, a, b; ^ user.cpp:30:18: warning: unused variable ‘m’ [-Wunused-variable] int i, j, n, m, a, b; ^ user.cpp:56:15: warning: ‘vm’ may be used uninitialized in this function [-Wmaybe-uninitialized] _g << w[vm] << " " << ctm << "\n"; ^