/in/foo.cc: In function 'int main()':
/in/foo.cc:143:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         ll mid = lft + rt >> 1;
                  ~~~~^~~~
/in/foo.cc:147:40: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
     if(lft < 500000) printf("%d\n", lft);
                                        ^