foo.cc: In function 'int main()':
foo.cc:43:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f[i][j]=max(f[i][j-1],f[i+(1<<j-1)][j-1]);
                                  ~^~
foo.cc:44:38: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f2[i][j]=min(f2[i][j-1],f2[i+(1<<j-1)][j-1]);
                                     ~^~

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