View Compilation Error

0_0_37742449_4785.cpp: In function 'void solve()':
0_0_37742449_4785.cpp:135:10: error: expected unqualified-id before '[' token
     auto [flow, cost] = g.solve();
          ^
0_0_37742449_4785.cpp:136:8: error: 'flow' was not declared in this scope
     if(flow != tot) cout << "Case #" << ++Case << ": -1\n";
        ^
0_0_37742449_4785.cpp:137:48: error: 'cost' was not declared in this scope
     else cout << "Case #" << ++Case << ": " << cost << "\n";
                                                ^