Compilare: user.cpp: In function ‘void solve()’: user.cpp:16:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(size_t h = 0; h < F[s[i]][0].size(); ++h) ^ user.cpp:17:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[i][i].push_back(F[s[i]][0][h]); ^ user.cpp: In function ‘int main()’: user.cpp:47:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] m[c1] = 1; ^ user.cpp:52:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] F[c2][c3].push_back(c1); ^ user.cpp:52:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] F[c2][c3].push_back(c1); ^