View Compilation Error

0_0_24651228_25282.cpp:8:7: error: 'MAXn' was not declared in this scope
 int v[MAXn];
       ^
0_0_24651228_25282.cpp: In function 'int main()':
0_0_24651228_25282.cpp:22:5: error: 'v' was not declared in this scope
     v[l++] = V;
     ^
0_0_24651228_25282.cpp:29:27: error: 'v' was not declared in this scope
    for(int j = sum/2;j >= v[i];j--){
                           ^