Compilare: main.cpp: In function 'void Dijkstra(int)': main.cpp:155:13: warning: unused variable 'dist' [-Wunused-variable] int dist = Q.begin()->first; ^~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^