Compilare: user.cpp: In function ‘void solve()’: user.cpp:35:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(size_t it = 0; it < F[c1][c2].size(); ++it) { ^ user.cpp:35:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(size_t it = 0; it < F[c1][c2].size(); ++it) { ^ user.cpp:36:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] int c = F[c1][c2][it]; ^ user.cpp:36:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] int c = F[c1][c2][it]; ^ user.cpp: In function ‘int main()’: user.cpp:57:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] m[c1] = 1; ^ user.cpp:67:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(M[c2][c3][c1] == 0) { ^ user.cpp:67:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(M[c2][c3][c1] == 0) { ^ user.cpp:67:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(M[c2][c3][c1] == 0) { ^ user.cpp:68:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] F[c2][c3].push_back(c1); ^ user.cpp:68:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] F[c2][c3].push_back(c1); ^ user.cpp:69:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[c2][c3][c1] = 1; ^ user.cpp:69:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[c2][c3][c1] = 1; ^ user.cpp:69:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[c2][c3][c1] = 1; ^