View Compilation Error

0_0_25801532_9507.cpp:76:1: error: expected unqualified-id before 'using'
 using namespace std;
 ^
0_0_25801532_9507.cpp:76:1: error: expected constructor, destructor, or type conversion before 'using'
0_0_25801532_9507.cpp: In function 'int main()':
0_0_25801532_9507.cpp:78:5: error: redefinition of 'int main()'
 int main()
     ^
0_0_25801532_9507.cpp:12:5: note: 'int main()' previously defined here
 int main()
     ^