View Compilation Error

0_0_31550663_22027.cpp:53:9: error: redefinition of 'int n'
     int n, m;
         ^
0_0_31550663_22027.cpp:12:5: note: 'int n' previously declared here
     n, m;
     ^
0_0_31550663_22027.cpp:53:12: error: redefinition of 'int m'
     int n, m;
            ^
0_0_31550663_22027.cpp:12:8: note: 'int m' previously declared here
     n, m;
        ^
0_0_31550663_22027.cpp:54:5: error: expected unqualified-id before 'while'
     while(cin>>n,n)
     ^