View Compilation Error

0_0_37947678_10829.cpp: In function 'void solve()':
0_0_37947678_10829.cpp:31:18: error: expected unqualified-id before '[' token
             auto [u, v] = e[i];
                  ^
0_0_37947678_10829.cpp:32:20: error: 'u' was not declared in this scope
             if(vec[u] == vec[v] && vec[u] == 0) cnt += a[i], vec[i] = 1;
                    ^
0_0_37947678_10829.cpp:32:30: error: 'v' was not declared in this scope
             if(vec[u] == vec[v] && vec[u] == 0) cnt += a[i], vec[i] = 1;
                              ^