View Compilation Error

0_0_37970371_27662.cpp: In lambda function:
0_0_37970371_27662.cpp:47:27: error: missing template arguments before 'A'
             ::std::vector A(0, 0);
                           ^
0_0_37970371_27662.cpp:48:13: error: 'A' was not declared in this scope
             A.reserve(S.size());
             ^