Solution to redundant_code

gistfile1.c

// Credit: token
#include <cstdio>

int cnt[1000000];
int n, m;
int buf;

int main()
{
	FILE *key = fopen("output", "r");
	fscanf(key, "%d%d", &n, &m);
	for (int i = 0; i < 2 * m; i++)
		fscanf(key, "%d", &buf),
		cnt[buf]++;
	
	int now = 1;
	while (now < n)
	{
		int k = cnt[now] / 2;
		printf("%c", '0' + k);
		now += (k + 2) * (k + 1) / 2;
	}
	
	return 0;
}