Writing Algorithms Every Day (Nim Game) Being a Good Boy in Spring Festival

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This topic, I directly remember the conclusion

code show as below:

#include<stdio.h>
intmain()
{
	int i,n,sum,ans,a[102];
	while(scanf("%d",&n)&&n)
	{
		for(i=0,sum=0;i<n;i++)
		{
			scanf("%d",&a[i]);
			sum^=a[i];
		}
		for(i=0,ans=0;i<n;i++)
		{
			if((sum^a[i])<a[i])
		       years++;
		}
		printf("%d\n",ans);
	}
	return 0;
}