/in/foo.cc: In function 'int main()':
/in/foo.cc:44:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    int mid=L+R>>1;
            ~^~
/in/foo.cc: In function 'int judge(int, int)':
/in/foo.cc:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^