Compilare: user.cpp: In function ‘int main()’: user.cpp:16:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x2 + 1][y2 + 1] = s[c][x2][y2] ^ 1; ^ user.cpp:16:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x2 + 1][y2 + 1] = s[c][x2][y2] ^ 1; ^ user.cpp:17:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x1][y1] = s[c][x1][y1] ^ 1; ^ user.cpp:17:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x1][y1] = s[c][x1][y1] ^ 1; ^ user.cpp:18:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x2+1][y1] = s[c][x2+1][y1] ^ 1; ^ user.cpp:18:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x2+1][y1] = s[c][x2+1][y1] ^ 1; ^ user.cpp:19:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x1][y2+1] = s[c][x1][y2+1] ^ 1; ^ user.cpp:19:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[c][x1][y2+1] = s[c][x1][y2+1] ^ 1; ^