View Compilation Error

0_0_27950865_9985.cpp: In function 'int main()':
0_0_27950865_9985.cpp:42:8: error: 'i' was not declared in this scope
     if(i!=j)//意思是去掉i这条边// 
        ^
0_0_27950865_9985.cpp:56:14: error: 'i' was not declared in this scope
    for(int j=i+1;j<=n+1;j++)//之所以从i+1开始，是因为要去掉i j这两调皮边//    {
              ^
0_0_27950865_9985.cpp:60:12: error: 'i' was not declared in this scope
      if(k==i||k==j)
            ^
0_0_27950865_9985.cpp:60:18: error: 'j' was not declared in this scope
      if(k==i||k==j)
                  ^
0_0_27950865_9985.cpp:74:17: error: 'ans' was not declared in this scope
   printf("%d\n",ans);
                 ^
0_0_27950865_9985.cpp: At global scope:
0_0_27950865_9985.cpp:76:2: error: expected unqualified-id before 'return'
  return 0; 
  ^
0_0_27950865_9985.cpp:77:1: error: expected declaration before '}' token
 }
 ^