Compilare: user.cpp: In function ‘char canMerge(std::string&, int, int)’: user.cpp:38:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!isMagic[c1] || !isMagic[c2]) ^ user.cpp:38:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!isMagic[c1] || !isMagic[c2]) ^ user.cpp:40:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] int msk = 7 & (~isMagic[c1]) & (~isMagic[c2]); ^ user.cpp:40:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] int msk = 7 & (~isMagic[c1]) & (~isMagic[c2]); ^ user.cpp: In function ‘int main()’: user.cpp:64:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] isMagic[magics[1 << i]] = (1 << i); ^ user.cpp:63:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %c", &magics[1 << i]); ^ user.cpp:67:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:70:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%s", &P, buf); ^