pku1939.cpp

这是ACM 方面的资料 是PKU的 北京大学的出来的

#include <stdio.h>

int main()
{
	int N, i;
	double x0, y0, x1, y1, x2, y2;
	while (scanf("%d", &N) != -1)
	{
		printf("%d ", N);
		scanf("%lf %lf", &x0, &y0);
		x1 = x0;
		y1 = y0;
		for (i = 1; i < N; i++)
		{
			scanf("%lf %lf", &x2, &y2);
			printf("%lf %lf ", (x1 + x2) / 2, (y1 + y2) / 2);
			x1 = x2;
			y1 = y2;
		}
		printf("%lf %lf\n", (x1 + x0) / 2, (y1 + y0) / 2);

	}
	return 0;
}