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个人用：hexo next主题配置文件详细说明

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#include <stdio.h>
int main()
{
	int x1 = 2, x2 = 0, x3 = -5, x4 = 8, i = 0;
	for (x1 = 2; x1 <= 35; x1++)
	{
		if (x1 + x2 + x3 + x4 == 30)i++;
		for (x2 = 0; x2 <= 35; x2++)
		{
			if (x1 + x2 + x3 + x4 == 30)i++;
			for (x3 = -5; x3 <= 35; x3++)
			{
				if (x1 + x2 + x3 + x4 == 30)i++;
				for (x4 = 8; x4 <= 35; x4++)
				{
					if (x1 + x2 + x3 + x4 == 30)i++;					
				}
			}
		}
	}
	printf("%d", i);

	return 0;
}