View Compilation Error

0_0_30867664_7432.cpp: In function 'int main()':
0_0_30867664_7432.cpp:67:23: error: too few arguments to function 'void* memset(void*, int, size_t)'
         memset(head,-1);tot=0;
                       ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstring:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:48,
                 from 0_0_30867664_7432.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:43:18: note: declared here
   void * __cdecl memset(void *_Dst,int _Val,size_t _Size);
                  ^