View Compilation Error

0_0_35981539_6673.cpp: In function 'int main()':
0_0_35981539_6673.cpp:106:14: error: expected unqualified-id before '[' token
         auto [cost,flow]=costflow(N,2);
              ^
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_35981539_6673.cpp:1:
0_0_35981539_6673.cpp:107:16: error: 'flow' was not declared in this scope
         assert(flow==2);
                ^
0_0_35981539_6673.cpp:108:27: error: 'cost' was not declared in this scope
         printf("%d\n",n*2-cost);
                           ^