Compilare: user.cpp: In function ‘int main()’: user.cpp:47:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(last[s[j]] <= i) last[s[j]] = i + 1, f[s[j]]++; ^ user.cpp:47:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(last[s[j]] <= i) last[s[j]] = i + 1, f[s[j]]++; ^ user.cpp:47:63: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(last[s[j]] <= i) last[s[j]] = i + 1, f[s[j]]++; ^ user.cpp: In function ‘char nextch()’: user.cpp:11:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^