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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     int x, y;
  6. } Point;
  7.  
  8. int main() {
  9.     int err, n;
  10.     scanf("%d", &err);
  11.     scanf("%d", &n);
  12.  
  13.     Point target, hide_sites[n];
  14.     scanf("%d %d", &target.x, &target.y);
  15.  
  16.     for (int i = 0; i < n; ++i) {
  17.         scanf("%d %d", &hide_sites[i].x, &hide_sites[i].y);
  18.     }
  19.  
  20.     double angle_error = err * 0.001; // 將 err 轉換為角度誤差
  21.     int min_head_error = 99999;
  22.     int head_index = -1;
  23.     int min_torso_error = 99999;
  24.     int torso_index1 = -1, torso_index2 = -1;
  25.  
  26.     for (int i = 0; i < n; ++i) {
  27.         int distance_square = (hide_sites[i].x - target.x) * (hide_sites[i].x - target.x) +
  28.                              (hide_sites[i].y - target.y) * (hide_sites[i].y - target.y);
  29.         double distance = sqrt(distance_square); // 距離
  30.         double error = distance * angle_error; // 轉換為角度誤差
  31.  
  32.         if (error <= min_head_error) {
  33.             min_head_error = error;
  34.             head_index = i;
  35.         }
  36.  
  37.         if (error <= min_torso_error) {
  38.             min_torso_error = error;
  39.             torso_index2 = torso_index1;
  40.             torso_index1 = i;
  41.         }
  42.     }
  43.  
  44.     int target_width = 0;
  45.  
  46.     if (min_head_error <= 1000) {
  47.         target_width = 15;
  48.     } else if (min_torso_error <= 2000) {
  49.         target_width = 35;
  50.     }
  51.  
  52.     int int_error = (int)round(min_head_error); // 四捨五入成最接近的整數
  53.  
  54.     if (int_error <= target_width) {
  55.         if (target_width == 15) {
  56.             printf("%d\n", head_index);
  57.         } else if (target_width == 35) {
  58.             printf("%d %d\n", torso_index1, torso_index2);
  59.         }
  60.     } else {
  61.         printf("abort\n");
  62.     }
  63.  
  64.     return 0;
  65. }
  66.  
Success #stdin #stdout 0.01s 5420KB
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https://ideone.com/6afnze
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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