View Compilation Error

0_0_38510293_18193.cpp: In function 'void solve()':
0_0_38510293_18193.cpp:33:5: error: 'function' was not declared in this scope
     function<int(int, int)> dfs = [&](int i, int j) {
     ^
0_0_38510293_18193.cpp:33:26: error: expression list treated as compound expression in functional cast [-fpermissive]
     function<int(int, int)> dfs = [&](int i, int j) {
                          ^
0_0_38510293_18193.cpp:33:14: error: expected primary-expression before 'int'
     function<int(int, int)> dfs = [&](int i, int j) {
              ^
0_0_38510293_18193.cpp:47:21: error: 'dfs' was not declared in this scope
     cout << dfs(0, 0) << endl;
                     ^