Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:137:22: warning: unused variable 'nod2' [-Wunused-variable] int nod, i, len, nod2; ^~~~ main.cpp: In function 'int main()': main.cpp:163:18: warning: unused variable 'c' [-Wunused-variable] int i, a, b, c; ^ main.cpp: In member function 'char blahblahin::read_ch()': main.cpp:14:29: 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); ^