/in/foo.cc: In function 'void st(int)':
/in/foo.cc:37:40: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    ST[i][j]=max1(ST[i][j-1],ST[i+pow2(j-1)][j-1]);
                                       ~^~
/in/foo.cc:8:21: note: in definition of macro 'pow2'
 #define pow2(x) (1<<x)
                     ^