View Compilation Error

0_0_38262209_28567.cpp: In function 'void solve()':
0_0_38262209_28567.cpp:46:18: error: expected unqualified-id before '[' token
             auto [u, v] = edges[i].second;
                  ^
0_0_38262209_28567.cpp:47:34: error: 'u' was not declared in this scope
             LL v1 = val[dsu.root(u)] + w * dsu.siz[dsu.root(v)];
                                  ^
0_0_38262209_28567.cpp:47:61: error: 'v' was not declared in this scope
             LL v1 = val[dsu.root(u)] + w * dsu.siz[dsu.root(v)];
                                                             ^