View Compilation Error

0_0_38706896_26393.c:8:1: error: unknown type name 'using'
    8 | using namespace std;
      | ^~~~~
0_0_38706896_26393.c:8:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    8 | using namespace std;
      |                 ^~~
0_0_38706896_26393.c:41:17: error: expected ';', ',' or ')' before '&' token
   41 | void update(int &k) {
      |                 ^
0_0_38706896_26393.c:48:17: error: expected ';', ',' or ')' before '&' token
   48 | void rotate(int &o,int d) {
      |                 ^
0_0_38706896_26393.c:57:17: error: expected ';', ',' or ')' before '&' token
   57 | void insert(int &root,int key) {
      |                 ^
0_0_38706896_26393.c:73:18: error: expected ';', ',' or ')' before '&' token
   73 | void mergeto(int &roota,int &rootb) {
      |                  ^
0_0_38706896_26393.c:95:19: error: expected ';', ',' or ')' before '&' token
   95 | void del_node(int &root,int o) {
      |                   ^