foo.cc: In function 'int main()':
foo.cc:4:15: warning: unused variable 'n' [-Wunused-variable]
    4 |         int i,n,h,ans=0;
      |               ^
foo.cc:11:16: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
   11 |         if (a[t]<=h+30)
      |             ~~~^
foo.cc:10:23: note: within this loop
   10 |         for (int t=1;t<=10;t++){
      |                      ~^~~~

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