Bittijono

#include <stdio.h>
#include <stdlib.h>

char * nextMember(char *, int *);

int main(){
	char * list = (char *)malloc(2 * sizeof(char));
	int input;
	int i = 1;
	list[0] = '0';
	list[1] = '\0';
	while (scanf("%d", &input) != EOF){
		start:
		if (input > i) {
			list = nextMember(list, &i);
			goto start;
		}
		printf("%c\n", list[input-1]);
	}
	

	free(list);
	return 0;

	
}

char * nextMember(char * prev, int * i){
	
	prev = (char *)realloc(prev, (*i * 2 + 1) * sizeof(char));
	for (int j = 0; j < *i; j++){
		if (prev[j] == '0') {
			prev[j + *i] = '1';
		}
		else {
			prev[j + *i] = '0';
		}
	}
	prev[*i * 2] = '\0';
	*i = *i * 2;
	return prev;
}

Test 1

Group: 1

Verdict: WRONG ANSWER

Test 2

Group: 2

Verdict: WRONG ANSWER

Test 3

Group: 3

Verdict: RUNTIME ERROR