View Compilation Error

0_0_37197039_24496.cpp:4:1: error: 'itn' does not name a type
 itn data[maxn];
 ^
0_0_37197039_24496.cpp: In function 'int Partition(int, int)':
0_0_37197039_24496.cpp:15:10: error: 'data' was not declared in this scope
 int temp=data[right];
          ^
0_0_37197039_24496.cpp: In function 'void quicksort(int, int)':
0_0_37197039_24496.cpp:28:27: error: 'partition' was not declared in this scope
 int i=partition(left,right);
                           ^
0_0_37197039_24496.cpp: In function 'int main()':
0_0_37197039_24496.cpp:37:34: error: 'data' was not declared in this scope
 for(int i=1;i<=n;i++)scanf("%d",&data[i]);
                                  ^
0_0_37197039_24496.cpp:39:15: error: 'data' was not declared in this scope
 printf("%d\n",data[(n+1)/2];
               ^