Compilare: user.cpp: In function ‘bool get()’: user.cpp:41:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans = ok[str[pos]]; ^ user.cpp: In function ‘int main()’: user.cpp:82:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[ch] ^= 1; ^ user.cpp:76:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(str + 1, MAXN, fi); ^ user.cpp:78:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&q); ^