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_21558472_27043.cpp:1:
0_0_21558472_27043.cpp: In function 'int karger_stein_reduce(int, std::vector<std::pair<std::pair<int, int>, int> >)':
0_0_21558472_27043.cpp:60:12: error: 'j' was not declared in this scope
     assert(j == opts);
            ^