Compilare: user.cpp: In function ‘char nextch()’: user.cpp:13:36: 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); ^ user.cpp: In function ‘int main()’: user.cpp:87:43: warning: ‘min’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cost=pq.top().cost, node=cost%min; ^