by@hakatashi
AC
<?php for(;$c=fgets(STDIN);)echo+!fmod(sqrt(8*bindec($c)+1),1);
10000011 10110000 00100000 01010101 00101101 10011001 00000000 10010111 10100001 01101001 11100111 11010100 00000110 10101011 10000000 10001000 01000101 11010010 01001110 11111011 01000010 00010101 10011011 01000000 10011010 00001111 01011011 00001010 01001110 00010110 00010100 01010100 10001011 01001100 11111101 00000001 10011101 00011100 10011001 01111000 10111110 01100000 00000011 00100100 00110111 01111001 01011001 01010011 00011011 10110010
00001110011011010110110001111000001101111011100000