Wrong Answer
/in/foo.cc: In function 'void check_left()': /in/foo.cc:23:20: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] int temp=list[n<<1-1].dest; ~^~
/in/foo.cc: In function 'void check_left()': /in/foo.cc:23:20: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] int temp=list[n<<1-1].dest; ~^~