10322 - 01串
考虑排好序的N(N<=31)位二进制数。
你会发现，这很有趣。因为他们是排列好的，而且包含所有可能的长度为N且含有1的个数小于等于L(L<=N)的数。
你的任务是输出第I（1<=I<=长度为N的二进制数的个数）大的，长度为N，且含有1的个数小于等于L的那个二进制数。
Input
共一行，用空格分开的三个整数N，L，I。
Output
共一行，输出满足条件的第I大的二进制数。
Examples
Input
5 3 19
Output
10011
Hint
Stringsobits Kim Schrijvers Consider an ordered set S of strings of N (1 <= N <= 31) bits. Bits, of course, are either 0 or 1.
This set of strings is interesting because it is ordered and contains all possible strings of length N that have L (1 <= L <= N) or fewer bits that are `1'.
Your task is to read a number I (1 <= I <= sizeof(S)) from the input and print the Ith element of the ordered set for N bits with no more than L bits that are `1'.
PROGRAM NAME: kimbits INPUT FORMAT A single line with three space separated integers: N, L, and I. SAMPLE INPUT (file kimbits.in) 5 3 19
OUTPUT FORMAT A single line containing the integer that represents the Ith element from the order set, as described. SAMPLE OUTPUT (file kimbits.out) 10011