/in/foo.cc: In function 'int kinds(int, int)':
/in/foo.cc:5:74: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(start==end||start==end-1&&(sentence[start]>='3'||sentence[start]=='2'&&(sentence[end]=='0'||sentence[end]>'6')))
                                                                           
/in/foo.cc:5:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(start==end||start==end-1&&(sentence[start]>='3'||sentence[start]=='2'&&(sentence[end]=='0'||sentence[end]>'6')))
                 ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:20:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^