View Compilation Error

0_0_28720469_20976.cpp:20:5: error: redefinition of 'int n'
 int n,m,ans;
     ^
0_0_28720469_20976.cpp:17:5: note: 'int n' previously declared here
 int n,k,ans;
     ^
0_0_28720469_20976.cpp:20:9: error: redefinition of 'int ans'
 int n,m,ans;
         ^
0_0_28720469_20976.cpp:17:9: note: 'int ans' previously declared here
 int n,k,ans;
         ^