foo.c: In function 'cl':
foo.c:13:24: warning: overflow in conversion from 'double' to 'long long int' changes value from '-9.9999999999999996e+27' to '-9223372036854775808' [-Woverflow]
   13 |                 arr[n]=-1e28;
      |                        ^
foo.c:4:15: warning: unused variable 't' [-Wunused-variable]
    4 |         int i,t;
      |               ^
foo.c:11:15: warning: '*arr[<unknown>]' may be used uninitialized [-Wmaybe-uninitialized]
   11 |         if(arr[n-1]>0)
      |            ~~~^~~~~

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