View Compilation Error

0_0_21863667_12897.cpp:82:7: error: conflicting declaration 'int a []'
 int a[]={13,67,34,123,4,56,7,9,12,23};
       ^
0_0_21863667_12897.cpp:25:14: note: previous declaration as 'unsigned int a [10000010]'
 unsigned int a[10000010];
              ^
0_0_21863667_12897.cpp:83:16: error: expected constructor, destructor, or type conversion before '(' token
     nth_element(a,a+5,a+10);
                ^
0_0_21863667_12897.cpp:84:5: error: expected unqualified-id before 'for'
     for(int i=0;i<10;i++)
     ^
0_0_21863667_12897.cpp:84:17: error: 'i' does not name a type
     for(int i=0;i<10;i++)
                 ^
0_0_21863667_12897.cpp:84:22: error: 'i' does not name a type
     for(int i=0;i<10;i++)
                      ^