Compilare: user.cpp: In function ‘bool element()’: user.cpp:41:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] else {k=v[s[p]];advance();p+=1;} ^ user.cpp: In function ‘int main()’: user.cpp:83:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[c]=!v[c]; ^ user.cpp:83:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[c]=!v[c]; ^ user.cpp:76:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,2010,f); ^ user.cpp:77:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.cpp:82:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^