View Compilation Error

0_0_37830638_6165.cpp: In function 'int main()':
0_0_37830638_6165.cpp:30:5: error: 'function' was not declared in this scope
     function <void(int)> dfs = [&](int x) {
     ^
0_0_37830638_6165.cpp:30:15: error: expected primary-expression before 'void'
     function <void(int)> dfs = [&](int x) {
               ^
0_0_37830638_6165.cpp:43:10: error: 'dfs' was not declared in this scope
     dfs(m), ans = 0; 
          ^