foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:16:9: warning: iteration 10004 invokes undefined behavior [-Waggressive-loop-optimizations]
   16 |   if(a[i]>0){
      |      ~~~^
foo.cc:15:15: note: within this loop
   15 |  for(int i=1;i<=10005;i++){
      |              ~^~~~~~~

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