Compilare: main.cpp: In function 'void create_graph()': main.cpp:82:21: warning: unused variable 'a' [-Wunused-variable] int a = 1; ^ main.cpp: In function 'void dfs(int)': main.cpp:95:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges[node].size(); ++i){ ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read(int&)': main.cpp:38:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:43:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^