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- #include <stdio.h>
- int main()
- {
- double N, a, x, y, i, in;
- while (1)
- {
- scanf("%lf %lf", &N, &a);
- if (N == 0 && a == 0) break;
- in = 0;
- for (i = 0 ; i < N; i++)
- {
- scanf("%lf %lf", &x, &y);
- if (x*x + y*y < a*a && x*x + (a-y)*(a-y) < a*a &&
- (a-x)*(a-x) + (a-y)*(a-y) < a*a && (a-x)*(a-x) + y*y < a*a)
- in ++;
- }
- printf("%.5lf\n", (in/N)*a*a);
- }
- return 0;
- }
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