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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int t;
  6.     double x1, y1, x2, y2, x3, t0, t1, t2, r;
  7.     scanf("%d", &t);
  8.     while(t--) {
  9.         scanf("%lf %lf %lf %lf", &x1, &y1, &x2, &y2);
  10.         if(fabsl(x1 - x2) < 1e-9) {
  11.         	printf("%.9lf\n", log(y2) - log(y1));
  12.         	continue;
  13.         }
  14.         if(x1 > x2 + 1e-9)
  15.             swap(x1, x2);
  16.         if(y1 > y2 + 1e-9)
  17.             swap(y1, y2);
  18.         t0 = atan((y2 - y1) / (x2 - x1));
  19.         x3 = ((y1 + y2) * tan(t0) + (x1 + x2)) / 2;
  20.         t1 = atan(y1 / (x3 - x1));
  21.         if(t1 < -1e-9)
  22.         	t1 += M_PI;
  23.         t2 = atan(y2 / (x3 - x2));
  24.         if(t2 < -1e-9)
  25.         	t2 += M_PI;
  26.         r = log(fabsl(1 / sin(t2) - 1 / tan(t2)));
  27.         r -= log(fabsl(1 / sin(t1) - 1 / tan(t1)));
  28.         printf("%.9lf\n", r);
  29.     }
  30.     return 0;
  31. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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2
3 7 8 2
123 456 789 10
stdout
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1.683757232
4.962046997
https://ideone.com/jpgNiR
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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