View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cassert:43:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:33,
                 from 0_0_25772060_23022.cpp:1:
0_0_25772060_23022.cpp: In function 'int main()':
0_0_25772060_23022.cpp:70:16: error: 'zzz' was not declared in this scope
         assert(zzz==C(n+k-1,k-1));
                ^