View Compilation Error

0_0_37900798_28647.cpp: In member function 'void Tarjan<N, G>::tarjan(int, const G&)':
0_0_37900798_28647.cpp:68:18: error: expected unqualified-id before '[' token
             auto [v, cost] = g.e[i];
                  ^
0_0_37900798_28647.cpp:70:22: error: 'v' was not declared in this scope
             if (!dfn[v]) {
                      ^
0_0_37900798_28647.cpp: In member function 'G Tarjan<N, G>::suodian(const G&)':
0_0_37900798_28647.cpp:106:22: error: expected unqualified-id before '[' token
                 auto [v, cost] = g.e[i];
                      ^
0_0_37900798_28647.cpp:107:33: error: 'v' was not declared in this scope
                 if (co[u] == co[v]) continue;
                                 ^
0_0_37900798_28647.cpp:109:35: error: 'v' was not declared in this scope
                 res.add(co[u], co[v], cost);
                                   ^
0_0_37900798_28647.cpp:109:39: error: 'cost' was not declared in this scope
                 res.add(co[u], co[v], cost);
                                       ^