View Compilation Error

0_0_30207961_18213.cpp: In function 'void add(int)':
0_0_30207961_18213.cpp:14:9: error: 'arr' was not declared in this scope
         arr[x]+=1;
         ^
0_0_30207961_18213.cpp: In function 'int getsum(int)':
0_0_30207961_18213.cpp:21:14: error: 'arr' was not declared in this scope
         sum+=arr[x];
              ^
0_0_30207961_18213.cpp: In function 'int main()':
0_0_30207961_18213.cpp:30:16: error: 'arr' was not declared in this scope
         memset(arr,0,sizeof(arr));
                ^
0_0_30207961_18213.cpp:33:24: error: 'get' was not declared in this scope
             ans[get(x+1)]++;
                        ^