View Compilation Error

0_0_36348654_13381.cpp: In function 'int main()':
0_0_36348654_13381.cpp:42:22: error: expected unqualified-id before '[' token
             for(auto [l, idx]: arr[i])
                      ^
0_0_36348654_13381.cpp:42:22: error: expected ';' before '[' token
0_0_36348654_13381.cpp:42:23: error: 'l' was not declared in this scope
             for(auto [l, idx]: arr[i])
                       ^
0_0_36348654_13381.cpp:42:26: error: 'idx' was not declared in this scope
             for(auto [l, idx]: arr[i])
                          ^
0_0_36348654_13381.cpp: In lambda function:
0_0_36348654_13381.cpp:42:30: error: expected '{' before ':' token
             for(auto [l, idx]: arr[i])
                              ^
0_0_36348654_13381.cpp: In function 'int main()':
0_0_36348654_13381.cpp:42:30: error: expected ';' before ':' token
0_0_36348654_13381.cpp:42:30: error: expected primary-expression before ':' token
0_0_36348654_13381.cpp:42:30: error: expected ')' before ':' token
0_0_36348654_13381.cpp:42:30: error: expected primary-expression before ':' token