Compilare: user.cpp: In function ‘void Heap_pop()’: user.cpp:73:16: warning: large integer implicitly truncated to unsigned type [-Woverflow] heap[last] = 1000000000000000000; ^ user.cpp: In function ‘char nextch()’: user.cpp:10:36: 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); ^