foo.cc: In function 'int main()':
foo.cc:18:21: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   18 |  for(int i=1;i+(1<<j-1)<=n;i++)
      |                    ~^~
foo.cc:20:37: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   20 |      f[i][j]=max(f[i][j-1],f[i+(1<<j-1)][j-1]);
      |                                    ~^~
foo.cc:21:37: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   21 |      d[i][j]=min(d[i][j-1],d[i+(1<<j-1)][j-1]);
      |                                    ~^~
foo.cc:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |         scanf("%d%d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~

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