Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:120:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<t[i].size();j++) { ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:49:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:23:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^