View Compilation Error

0_0_29524560_1376.cpp:5:7: error: 'maxn' was not declared in this scope
 int a[maxn],b[maxn];
       ^
0_0_29524560_1376.cpp:5:15: error: 'maxn' was not declared in this scope
 int a[maxn],b[maxn];
               ^
0_0_29524560_1376.cpp: In function 'int main()':
0_0_29524560_1376.cpp:10:44: error: 'b' was not declared in this scope
         int n,m;scanf("%d%d",&n,&m);memset(b,0,sizeof(b));
                                            ^
0_0_29524560_1376.cpp:11:42: error: 'a' was not declared in this scope
         for(int i=0;i<n;i++) scanf("%d",&a[i]);
                                          ^
0_0_29524560_1376.cpp:15:44: error: 'a' was not declared in this scope
                 for(int j=i;j<n;j++) b[j]^=a[j-i];
                                            ^