View Compilation Error

0_0_38198365_17292.cpp: In function 'void get_fact(int, int)':
0_0_38198365_17292.cpp:38:16: error: expected unqualified-id before '[' token
     for (auto &[a,b] : mp[x - 1]) {
                ^
0_0_38198365_17292.cpp:38:16: error: expected ';' before '[' token
0_0_38198365_17292.cpp:38:19: error: 'b' was not declared in this scope
     for (auto &[a,b] : mp[x - 1]) {
                   ^
0_0_38198365_17292.cpp: In lambda function:
0_0_38198365_17292.cpp:38:22: error: expected '{' before ':' token
     for (auto &[a,b] : mp[x - 1]) {
                      ^
0_0_38198365_17292.cpp: In function 'void get_fact(int, int)':
0_0_38198365_17292.cpp:38:22: error: expected ';' before ':' token
0_0_38198365_17292.cpp:38:22: error: expected primary-expression before ':' token
0_0_38198365_17292.cpp:38:22: error: expected ')' before ':' token
0_0_38198365_17292.cpp:38:22: error: expected primary-expression before ':' token