Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:104:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vecini.size(); ++j){ ~~^~~~~~~~~~~~~~~ main.cpp:106:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j2 = 0; j2 < vecini.size(); ++j2){ ~~~^~~~~~~~~~~~~~~ main.cpp:121:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < vecini.size(); ++j){ ~~^~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:17:29: 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); ^