memory.cpp: In function 'void play()':
memory.cpp:9:45: warning: array subscript has type 'char' [-Wchar-subscripts]
9 | for (int i = 1; i <= 50; i++) pos[faceup(i)].push_back(i);
| ~~~~~~^~~
memory.cpp:10:50: warning: array subscript has type 'char' [-Wchar-subscripts]
10 | for (char c = 'A'; c <= 'Y'; c++) faceup(pos[c][0]), faceup(pos[c][1]);
| ^
memory.cpp:10:69: warning: array subscript has type 'char' [-Wchar-subscripts]
10 | for (char c = 'A'; c <= 'Y'; c++) faceup(pos[c][0]), faceup(pos[c][1]);
| ^