View Compilation Error

0_0_30432982_3666.cpp:1:2: error: invalid preprocessing directive #ainclude
 #ainclude<bits/stdc++.h>
  ^
0_0_30432982_3666.cpp:5:1: error: 'pair' does not name a type
 pair<double,int>p[N];
 ^
0_0_30432982_3666.cpp: In function 'int main()':
0_0_30432982_3666.cpp:8:25: error: 'stdin' was not declared in this scope
     freopen("i.txt","r",stdin);
                         ^
0_0_30432982_3666.cpp:8:30: error: 'freopen' was not declared in this scope
     freopen("i.txt","r",stdin);
                              ^
0_0_30432982_3666.cpp:10:25: error: 'scanf' was not declared in this scope
     while(~scanf("%d",&n))
                         ^
0_0_30432982_3666.cpp:24:13: error: 'p' was not declared in this scope
             p[j]={a[i],i};
             ^
0_0_30432982_3666.cpp:27:14: error: 'p' was not declared in this scope
         sort(p,p+m);
              ^
0_0_30432982_3666.cpp:27:19: error: 'sort' was not declared in this scope
         sort(p,p+m);
                   ^
0_0_30432982_3666.cpp:37:30: error: 'printf' was not declared in this scope
         printf("%.2f\n",sum/n);
                              ^