View Compilation Error

0_0_38288956_14114.cpp: In function 'void kru()':
0_0_38288956_14114.cpp:26:8: error: expected unqualified-id before '[' token
   auto [w,u,v] = edge[i];
        ^
0_0_38288956_14114.cpp:27:17: error: 'u' was not declared in this scope
   int fu = getf(u);
                 ^
0_0_38288956_14114.cpp:28:17: error: 'v' was not declared in this scope
   int fv = getf(v);
                 ^
0_0_38288956_14114.cpp:32:11: error: 'w' was not declared in this scope
    ans += w;
           ^