View Compilation Error

0_0_32506885_19871.cpp: In function 'int main()':
0_0_32506885_19871.cpp:58:14: error: 'f' was not declared in this scope
     p[k].f = f;
              ^
0_0_32506885_19871.cpp:60:6: error: 'f' was not declared in this scope
    p[f].c += p[j].c;
      ^