/in/foo.cc: In function 'int main()':
/in/foo.cc:18:46: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      maxv[j][i]=max(maxv[j][i-1],maxv[j+(1<<i-1)][i-1]),
                                             ~^~
/in/foo.cc:19:46: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      minv[j][i]=min(minv[j][i-1],minv[j+(1<<i-1)][i-1]);
                                             ~^~
/in/foo.cc:25:7: warning: unused variable 'ans_min' [-Wunused-variable]
   int ans_min=min(minv[l][lg[r-l+1]],minv[r+1-(1<<lg[r-l+1])][lg[r-l+1]]);
       ^~~~~~~