Compilare: main.cpp: In function 'int Dijkstra(int)': main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:15:30: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, f); ^ main.cpp: In function 'void Solve()': main.cpp:120:21: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<ans<<" "<<sol; ^