View Compilation Error

0_0_22198273_22396.cpp: In function 'int main()':
0_0_22198273_22396.cpp:36:12: error: 'cin' was not declared in this scope
     while (cin>>m>>n>>t)
            ^
0_0_22198273_22396.cpp:80:34: error: 'abs' was not declared in this scope
         if (t%2!=(abs(x1-x2+y1-y2))%2)
                                  ^