View Compilation Error

0_0_37728687_31935.cpp: In function 'void build(int)':
0_0_37728687_31935.cpp:58:15: error: expected unqualified-id before '[' token
     for (auto [k, v] : st[j]) {
               ^
0_0_37728687_31935.cpp:58:15: error: expected ';' before '[' token
0_0_37728687_31935.cpp:58:16: error: 'k' was not declared in this scope
     for (auto [k, v] : st[j]) {
                ^
0_0_37728687_31935.cpp:58:19: error: 'v' was not declared in this scope
     for (auto [k, v] : st[j]) {
                   ^
0_0_37728687_31935.cpp: In lambda function:
0_0_37728687_31935.cpp:58:22: error: expected '{' before ':' token
     for (auto [k, v] : st[j]) {
                      ^
0_0_37728687_31935.cpp: In function 'void build(int)':
0_0_37728687_31935.cpp:58:22: error: expected ';' before ':' token
0_0_37728687_31935.cpp:58:22: error: expected primary-expression before ':' token
0_0_37728687_31935.cpp:58:22: error: expected ')' before ':' token
0_0_37728687_31935.cpp:58:22: error: expected primary-expression before ':' token