foo.cc: In function 'int main()':
foo.cc:17:65: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   17 |   for(int j=1;j+(1<<i)-1<=n;++j) f[j][i]=max(f[j][i-1],f[j+(1<<i-1)][i-1]);
      |                                                                ~^~

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