Compilare: user.cpp: In function ‘void read()’: user.cpp:23:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[a][b]=1; ^ user.cpp:23:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[a][b]=1; ^ user.cpp:24:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] gre[a]++;gri[b]++; ^ user.cpp:24:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] gre[a]++;gri[b]++; ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:87:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i=0;i<G[nod].size();i++) ^ user.cpp:108:14: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(nod!=par[G[nod][i]]) ^ user.cpp: In function ‘void solve(int)’: user.cpp:135:13: warning: unused variable ‘fiu’ [-Wunused-variable] int fiu = G[nod][i]; ^