In file included from /usr/include/c++/4.4/unordered_map:35, from lant.cpp:3: /usr/include/c++/4.4/c++0x_warning.h:31:2: error: #error This file requires compiler and library support for the upcoming ISO C++ standard, C++0x. This support is currently experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options. lant.cpp:16: error: expected constructor, destructor, or type conversion before '<' token lant.cpp:17: error: expected constructor, destructor, or type conversion before '<' token lant.cpp: In function 'int main()': lant.cpp:51: warning: comparison between signed and unsigned integer expressions lant.cpp:59: error: 'dp' was not declared in this scope lant.cpp:68: error: 'dp' was not declared in this scope lant.cpp:73: warning: comparison between signed and unsigned integer expressions lant.cpp:75: error: 'dp' was not declared in this scope lant.cpp:76: warning: comparison between signed and unsigned integer expressions lant.cpp:78: error: 'NEXT' was not declared in this scope lant.cpp:82: error: 'NEXT' was not declared in this scope lant.cpp:83: error: 'dp' was not declared in this scope lant.cpp:86: error: 'dp' was not declared in this scope lant.cpp:88: error: 'dp' was not declared in this scope