View Compilation Error

0_0_39837707_32252.cpp:4:1: error: expected initializer before 'int'
    4 | int find_set(int x){
      | ^~~
0_0_39837707_32252.cpp: In function 'void merge_set(int, int)':
0_0_39837707_32252.cpp:10:11: error: 'find_set' was not declared in this scope
   10 |         i=find_set(i);
      |           ^~~~~~~~
0_0_39837707_32252.cpp:12:18: error: 'root' was not declared in this scope
   12 |         if(i!=j) root(j)=i;
      |                  ^~~~
0_0_39837707_32252.cpp: In function 'int main()':
0_0_39837707_32252.cpp:21:13: error: 'root' was not declared in this scope
   21 |             root[i] = i;
      |             ^~~~
0_0_39837707_32252.cpp:30:19: error: 'root' was not declared in this scope
   30 |             if(i==root[i])
      |                   ^~~~