Compilare: user.cpp: In function ‘int main()’: user.cpp:70:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(H.find(c) && H.V[c].size() >= p) ^ 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); ^