View Compilation Error

0_0_31637492_13577.cpp: In function 'int ws(int)':
0_0_31637492_13577.cpp:8:5: error: 's' was not declared in this scope
     s=ws(n-1)*3;
     ^
0_0_31637492_13577.cpp:11:17: error: 'wsx' was not declared in this scope
        o=wsx(n-2)*3+(ws(n-1)-ws(n-2))*2;
                 ^