View Compilation Error

0_0_24067639_16851.cpp:8:9: error: macro names must be identifiers
 #define 100000 MAXSIZE
         ^
0_0_24067639_16851.cpp: In function 'int main()':
0_0_24067639_16851.cpp:14:23: error: 'MAXSIZE' was not declared in this scope
   vector<int>unionf(0,MAXSIZE);
                       ^