by@kurgm
WA
import std.stdio;import std.math;void main(){int a,i;for(;i++<50;write(1-(sqrt(1+8*cast(real)a)%1>0)))readf("%b ",&a);}00001010 00011100 00110111 01000100 01001110 00011011 11100111 00100100 11010010 11000011 10010101 01101001 01011011 00101100 10001000 01101001 01100100 01010001 01111110 01110100 01000010 01011000 10000000 10111110 00010101 00001011 10100101 10111100 11111101 10001110 10011001 00000110 00000001 10111111 00000011 00001111 10011101 10101100 10010110 10101101 10101011 11010011 01101111 00000110 01111000 00101111 00101101 00000000 00011010 01000000
bash: D (GDC): command not found