View Compilation Error

0_0_16034364_29040.cpp: In function 'void init()':
0_0_16034364_29040.cpp:15:2: error: 'per' was not declared in this scope
  per[i]=i;
  ^
0_0_16034364_29040.cpp: In function 'int find(int)':
0_0_16034364_29040.cpp:20:11: error: 'per' was not declared in this scope
  while(x!=per[x])
           ^
0_0_16034364_29040.cpp: In function 'bool join(int, int)':
0_0_16034364_29040.cpp:30:3: error: 'per' was not declared in this scope
   per[fx]=fy;
   ^
0_0_16034364_29040.cpp: In function 'int main()':
0_0_16034364_29040.cpp:61:17: error: 'sort' was not declared in this scope
   sort(s,s+k,cmp);
                 ^