View Compilation Error

0_0_17297824_1402.cpp: In function 'int work()':
0_0_17297824_1402.cpp:97:13: error: 'tot' was not declared in this scope
         mem(tot,0);mem(num,0);
             ^
0_0_17297824_1402.cpp:35:27: note: in definition of macro 'mem'
 #define mem(x,val) memset(x,val,sizeof(x))
                           ^