View Compilation Error

0_0_23245364_23683.cpp: In function 'void check()':
0_0_23245364_23683.cpp:24:46: error: 'next_permutation' was not declared in this scope
         }while(next_permutation(eneny,eneny+n));
                                              ^
0_0_23245364_23683.cpp: In function 'int main()':
0_0_23245364_23683.cpp:67:42: error: 'next_permutation' was not declared in this scope
           }while(next_permutation(mp,mp+n));
                                          ^