Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:33:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] aparitii[s[j]]++; ^ user.cpp:61:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(aparitii[s[j]]%2==0) ^ user.cpp:17:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:18:19: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 350, in); ^ user.cpp:23:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 350, in); ^