Compilare: user.cpp: In function ‘void add(char*, char*)’: user.cpp:20:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] res[++res[0]] = 1; ^ user.cpp: In function ‘void divide(char*, int)’: user.cpp:34:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (A[0] > 0 && A[A[0]] == 0) { ^ user.cpp: In function ‘int main()’: user.cpp:78:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] res[++res[0]] = x2[x2[0]-i+1]; ^ user.cpp:41:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("easylca.in", "r", stdin); ^ user.cpp:42:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("easylca.out", "w", stdout); ^ user.cpp:45:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &tests); ^ user.cpp:48:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s\n", x+1, y+1); ^