Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[nod].size(); i++ ){ ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:42:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[nod].size(); i++ ){ ^ user.cpp: In function ‘int main()’: user.cpp:51:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, 1, SZ, fin ); ^ user.cpp: In function ‘void read(int&)’: user.cpp:18:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, 1, SZ, fin ), pos = 0; ^ user.cpp:24:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, 1, SZ, fin ), pos = 0; ^