/in/foo.cc: In function 'void work()':
/in/foo.cc:37:31: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      num[i][j]=num[i][j]|(1<<l-1);
                              ~^~
/in/foo.cc:51:15: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      f[i|(1<<j-1)]=min(f[i|(1<<j-1)],f[i]+1);
              ~^~
/in/foo.cc:51:33: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      f[i|(1<<j-1)]=min(f[i|(1<<j-1)],f[i]+1);
                                ~^~