[C](0.112)
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| #include<stdio.h> | |
| double distance( double x1, double y1, double x2, double y2 ) | |
| { | |
| return (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2); | |
| } | |
| int main() | |
| { | |
| int N, a; | |
| while( scanf( "%d%d", &N, &a ) != EOF && N != 0 && a != 0 ) | |
| { | |
| int i; | |
| int M = 0; | |
| for( i = 0 ; i < N ; i++ ) | |
| { | |
| double x, y; | |
| scanf( "%lf%lf", &x, &y ); | |
| if( distance( x, y, 0.0, 0.0 ) <= (double)(a*a) ) | |
| if( distance( x, y, 0.0, (double)a ) <= (double)(a*a) ) | |
| if( distance( x, y, (double)a, (double)a ) <= (double)(a*a) ) | |
| if( distance( x, y, (double)a, 0.0 ) <= (double)(a*a) ) | |
| M++; | |
| } | |
| printf( "%.5lf\n", (double)M/(double)N*(double)a*(double)a ); | |
| } | |
| return 0; | |
| } |
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