Compilare: user.cpp: In function ‘int main()’: user.cpp:47:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] util[c] = true; ^ user.cpp:48:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] Ans[c] += sign; ^ user.cpp:53:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!util[c]) continue; ^ user.cpp:54:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] printf("%c %ld\n",c,Ans[c]); ^ user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.in","r",stdin); ^ user.cpp:20:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.out","w",stdout); ^ user.cpp:22:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); n = strlen(s); ^