/in/foo.cc: In function 'int main()':
/in/foo.cc:13:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=0;i<n;i++) scanf("%d",&p[i]);p[n]=l;
  ^~~
/in/foo.cc:13:41: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(int i=0;i<n;i++) scanf("%d",&p[i]);p[n]=l;
                                         ^
/in/foo.cc:16:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=bot+top>>1,pre=0,tot=0;
           ~~~^~~~