View Compilation Error

0_0_39440281_20083.cpp: In function 'int main()':
0_0_39440281_20083.cpp:24:20: error: 'cmp' was not declared in this scope
   24 |     sort(a+1,a+m+1,cmp);
      |                    ^~~
0_0_39440281_20083.cpp:34:23: error: 'struct e' has no member named 'x'
   34 |             sum+=a[i].x;
      |                       ^