View Compilation Error

0_0_37459922_1363.cpp: In function 'int main()':
0_0_37459922_1363.cpp:111:14: error: expected unqualified-id before '[' token
         auto [ff,cc]=f.solve();
              ^
0_0_37459922_1363.cpp:112:23: error: 'cc' was not declared in this scope
         printf("%d\n",cc);
                       ^