View Compilation Error

0_0_21878980_9035.cpp: In function 'int main()':
0_0_21878980_9035.cpp:155:6: error: 'MDS' was not declared in this scope
   ms(MDS);
      ^
0_0_21878980_9035.cpp:35:24: note: in definition of macro 'ms'
 #define ms(Arr) memset(Arr,0,sizeof(Arr));
                        ^