View Compilation Error

0_0_32861318_1942.cpp: In function 'int prim()':
0_0_32861318_1942.cpp:10:28: error: 'memset' was not declared in this scope
  memset(mark,0,sizeof(mark));
                            ^
0_0_32861318_1942.cpp:17:6: error: 'i' was not declared in this scope
  for(i=1;i<n;i++)
      ^
0_0_32861318_1942.cpp:33:7: error: 'j' was not declared in this scope
   for(j=0;j<n;j++)
       ^
0_0_32861318_1942.cpp: In function 'int main()':
0_0_32861318_1942.cpp:49:7: error: 'i' was not declared in this scope
   for(i=0;i<n-1;i++)
       ^