View Compilation Error

0_0_15354665_4287.cpp:30:4: error: 'maxn' was not declared in this scope
 }a[maxn];
    ^
0_0_15354665_4287.cpp:31:8: error: 'maxn' was not declared in this scope
 int pa[maxn];
        ^
0_0_15354665_4287.cpp: In function 'int main()':
0_0_15354665_4287.cpp:40:16: error: 'a' was not declared in this scope
         memset(a,0,sizeof(a));
                ^
0_0_15354665_4287.cpp:41:16: error: 'pa' was not declared in this scope
         memset(pa,-1,sizeof(pa));
                ^