View Compilation Error

0_0_21855189_25830.cpp:21:11: error: 'maxm' was not declared in this scope
 int n,m,a[maxm],b[maxm];
           ^
0_0_21855189_25830.cpp:21:19: error: 'maxm' was not declared in this scope
 int n,m,a[maxm],b[maxm];
                   ^
0_0_21855189_25830.cpp: In function 'int main()':
0_0_21855189_25830.cpp:27:25: error: 'b' was not declared in this scope
             scanf("%d",&b[i]);
                         ^
0_0_21855189_25830.cpp:31:14: error: 'b' was not declared in this scope
         sort(b+1,b+1+m);
              ^
0_0_21855189_25830.cpp:32:9: error: 'a' was not declared in this scope
         a[1]=b[1];
         ^