View Compilation Error

0_0_23333432_28732.cpp: In function 'int main()':
0_0_23333432_28732.cpp:22:10: error: 'j' was not declared in this scope
      for(j=1;j<=k;j++) {
          ^
0_0_23333432_28732.cpp:25:26: error: 'sort' was not declared in this scope
         sort(a+1,a+n+1,my);
                          ^
0_0_23333432_28732.cpp:26:13: error: 'j' was not declared in this scope
         for(j=1;j<=k;j++)
             ^
0_0_23333432_28732.cpp:38:6: error: 'j' was not declared in this scope
   if(j==k+1)
      ^