View Compilation Error

0_0_38023291_6756.cpp: In function 'void solve()':
0_0_38023291_6756.cpp:56:8: error: expected unqualified-id before '[' token
   auto [x, y, w] = g[i];
        ^
0_0_38023291_6756.cpp:57:17: error: 'x' was not declared in this scope
   int fx = find(x), fy = find(y);
                 ^
0_0_38023291_6756.cpp:58:13: error: 'fy' was not declared in this scope
   if (fx != fy) {
             ^