View Compilation Error

0_0_36441255_754.cpp: In function 'void input()':
0_0_36441255_754.cpp:45:15: error: 'readin' was not declared in this scope
     n=readin(1);
               ^
0_0_36441255_754.cpp: In function 'int main()':
0_0_36441255_754.cpp:166:15: error: 'readin' was not declared in this scope
     T=readin(1);
               ^