Compilare: user.cpp: In function ‘int main()’: user.cpp:53:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(c2.size() && a[x][y]==a[c2.front().first][c2.front().second]) ^ user.cpp:53:73: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(c2.size() && a[x][y]==a[c2.front().first][c2.front().second]) ^ user.cpp:67:73: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[xn][yn]=d[c2.front().first][c2.front().second]; ^ user.cpp:67:92: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[xn][yn]=d[c2.front().first][c2.front().second]; ^