foo.cc: In function 'void init()':
foo.cc:58:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'int getmax(int)':
foo.cc:19:7: warning: iteration 1000 invokes undefined behavior [-Waggressive-loop-optimizations]
   19 |   f[i]=INF;
      |       ^
foo.cc:18:15: note: within this loop
   18 |  for(int i=1;i<=M;i++)
      |               ^

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