View Compilation Error

0_0_38158788_24089.cpp: In function 'int bfs(int)':
0_0_38158788_24089.cpp:70:18: error: expected unqualified-id before '[' token
             auto [v, cost] = g.e[i];
                  ^
0_0_38158788_24089.cpp:71:21: error: 'v' was not declared in this scope
             if (dis[v] != -1) continue;
                     ^
0_0_38158788_24089.cpp:73:17: error: 'v' was not declared in this scope
             dis[v] = dis[u] + cost;
                 ^
0_0_38158788_24089.cpp:73:31: error: 'cost' was not declared in this scope
             dis[v] = dis[u] + cost;
                               ^