View Compilation Error

0_0_37827488_28945.cpp: In function 'void kruskal()':
0_0_37827488_28945.cpp:21:8: error: expected unqualified-id before '[' token
   auto [u, v] = e[i];
        ^
0_0_37827488_28945.cpp:22:3: error: 'u' was not declared in this scope
   u = find(u), v = find(v);
   ^
0_0_37827488_28945.cpp:22:16: error: 'v' was not declared in this scope
   u = find(u), v = find(v);
                ^