View Compilation Error

0_0_36207084_1758.cpp: In function 'int main()':
0_0_36207084_1758.cpp:40:5: error: 'function' was not declared in this scope
     function<void(int,int,vector<long long>&,vector<long long>&)>dfs=[&](int pos,long long now,vector<long long>&in,vector<long long>&out){
     ^
0_0_36207084_1758.cpp:40:64: error: expression list treated as compound expression in functional cast [-fpermissive]
     function<void(int,int,vector<long long>&,vector<long long>&)>dfs=[&](int pos,long long now,vector<long long>&in,vector<long long>&out){
                                                                ^
0_0_36207084_1758.cpp:40:14: error: expected primary-expression before 'void'
     function<void(int,int,vector<long long>&,vector<long long>&)>dfs=[&](int pos,long long now,vector<long long>&in,vector<long long>&out){
              ^
0_0_36207084_1758.cpp:52:17: error: 'dfs' was not declared in this scope
     dfs(0,0,a,aa);
                 ^