Compilare: main.cpp: In function 'void solve()': main.cpp:36:27: warning: array subscript has type 'char' [-Wchar-subscripts] first_two[sz++] = ch; ^ main.cpp:38:27: warning: array subscript has type 'char' [-Wchar-subscripts] first_two[sz++] = ch; ^ main.cpp:50:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (first_two[0] == 'N' && first_two[1] == 'V' || first_two[0] == 'S' && first_two[1] == 'E') ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:52:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if (first_two[0] == 'N' && first_two[1] == 'E' || first_two[0] == 'S' && first_two[1] == 'V') ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:54:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if (first_two[0] == 'V' && first_two[1] == 'N' || first_two[0] == 'E' && first_two[1] == 'S') ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:56:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if (first_two[0] == 'E' && first_two[1] == 'N' || first_two[0] == 'V' && first_two[1] == 'S') ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~