View Compilation Error

0_0_22837027_5334.cpp: In function 'void work(int)':
0_0_22837027_5334.cpp:16:84: error: 'poa' was not declared in this scope
          temp=a[t[0]-'A']-pow(a[t[1]-'A'],2)+pow(a[t[2]-'A'],3)-pow(a[t[3]-'A'],4)+poa[t[4]-'A'],5);
                                                                                    ^