View Compilation Error

0_0_31036164_22861.cpp:25:5: error: redefinition of 'int n'
 int n,k,A,B;
     ^
0_0_31036164_22861.cpp:15:5: note: 'int n' previously declared here
 int n,k;
     ^
0_0_31036164_22861.cpp:25:7: error: redefinition of 'int k'
 int n,k,A,B;
       ^
0_0_31036164_22861.cpp:15:7: note: 'int k' previously declared here
 int n,k;
       ^