0_0_38641210_24405.cpp: In function 'int main()':
0_0_38641210_24405.cpp:45:10: error: 'function' is not a member of 'std'
std::function<void(std::vector<int>&, int, int, int, int&)> dfs = [&] (std::vector<int> &ps, int c, int x, int f, int& ans) {
^~~~~~~~
0_0_38641210_24405.cpp:45:10: note: 'std::function' is defined in header '<functional>'; did you forget to '#include <functional>'?
0_0_38641210_24405.cpp:4:1:
+#include <functional>
0_0_38641210_24405.cpp:45:10:
std::function<void(std::vector<int>&, int, int, int, int&)> dfs = [&] (std::vector<int> &ps, int c, int x, int f, int& ans) {
^~~~~~~~
0_0_38641210_24405.cpp:45:62: error: expression list treated as compound expression in functional cast [-fpermissive]
std::function<void(std::vector<int>&, int, int, int, int&)> dfs = [&] (std::vector<int> &ps, int c, int x, int f, int& ans) {
^
0_0_38641210_24405.cpp:45:19: error: expected primary-expression before 'void'
std::function<void(std::vector<int>&, int, int, int, int&)> dfs = [&] (std::vector<int> &ps, int c, int x, int f, int& ans) {
^~~~
0_0_38641210_24405.cpp: In lambda function:
0_0_38641210_24405.cpp:65:9: error: 'dfs' was not declared in this scope
dfs(ps, 0, 1, -1, ans);
^~~
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