View Compilation Error

0_0_22070572_2942.cpp:17:9: error: 'd' was not declared in this scope
 int cmp(d a,d b)
         ^
0_0_22070572_2942.cpp:17:13: error: 'd' was not declared in this scope
 int cmp(d a,d b)
             ^
0_0_22070572_2942.cpp:17:16: error: expression list treated as compound expression in initializer [-fpermissive]
 int cmp(d a,d b)
                ^
0_0_22070572_2942.cpp:18:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_22070572_2942.cpp: In function 'int main()':
0_0_22070572_2942.cpp:56:13: error: 'a' was not declared in this scope
             a[i].u=u;a[i].v=v;a[i].val=val;
             ^
0_0_22070572_2942.cpp:58:14: error: 'a' was not declared in this scope
         sort(a+1,a+m+1,cmp);ans=0;
              ^