Compilare: main.cpp: In function 'void dfs(int)': main.cpp:72:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FOR(i,a,b) for (int i = (a); i < (b); ++i) ^ main.cpp:167:2: note: in expansion of macro 'FOR' FOR(i,0,G[x].size()) ^~~ main.cpp: In member function 'char Parser::getChar()': main.cpp:14:48: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(str, sizeof(char), SIZE, fin); ^