View Compilation Error

0_0_18098539_20353.cpp:30:20: error: conflicting declaration 'int head [100010]'
 int T,n,a[N],head[N],tot,ret[N],dp[N][2],id[N],kase;
                    ^
0_0_18098539_20353.cpp:16:26: note: previous declaration as 'char* head'
 char buffer[BufferSize],*head,*tail;
                          ^