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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main() {
  5.     int err, n, Tx, Ty;
  6.     scanf("%d", &err);
  7.     scanf("%d", &n);
  8.     scanf("%d %d", &Tx, &Ty);
  9.  
  10.     int minHeadError = 2000 * err;
  11.     int headIndex = -1;
  12.     int torsoIndex1 = -1;
  13.     int torsoIndex2 = -1;
  14.     int minTorsoError = 2000 * err;
  15.  
  16.     for (int i = 0; i < n; ++i) {
  17.         int x, y;
  18.         scanf("%d %d", &x, &y);
  19.  
  20.         int distanceSquared = (x - Tx) * (x - Tx) + (y - Ty) * (y - Ty);
  21.         int mils = (int)sqrt(distanceSquared) * 1000 / distanceSquared;
  22.  
  23.         if (mils <= err) {
  24.             int torsoError = (int)sqrt((x - Tx) * (x - Tx) + (y - Ty) * (y - Ty));
  25.             if (torsoError <= err && torsoError < minTorsoError) {
  26.                 if (torsoIndex1 == -1) {
  27.                     torsoIndex1 = i;
  28.                     minTorsoError = torsoError;
  29.                 } else {
  30.                     torsoIndex2 = i;
  31.                 }
  32.             }
  33.             if (torsoError > err && mils < minHeadError) {
  34.                 headIndex = i;
  35.                 minHeadError = mils;
  36.             }
  37.         }
  38.     }
  39.  
  40.     if (headIndex != -1) {
  41.         printf("%d\n", headIndex);
  42.     } else if (torsoIndex1 != -1 && torsoIndex2 != -1) {
  43.         printf("%d %d\n", torsoIndex1, torsoIndex2);
  44.     } else {
  45.         printf("abort\n");
  46.     }
  47.  
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0s 5460KB
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https://ideone.com/pOrlbv
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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