/in/foo.cc: In function 'void insert(long long int&, long long int, long long int, long long int, long long int)':
/in/foo.cc:28:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     long long mid=l+r>>1;
                   ~^~
/in/foo.cc: In function 'void find_th(long long int&, long long int, long long int, long long int)':
/in/foo.cc:52:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     long long mid=l+r>>1;
                   ~^~