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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4.  
  5. double calculate_mean(int *arr, int size) {
  6.     double sum = 0.0;
  7.     for (int i = 0; i < size; i++) {
  8.         sum += arr[i];
  9.     }
  10.     return sum / size;
  11. }
  12.  
  13. int main() {
  14.     int arr[30];
  15.     int size = 0;
  16.  
  17.     while (size < 30 && scanf("%d", &arr[size]) == 1) {
  18.         size++;
  19.     }
  20.  
  21.     if (size == 0 || (ferror(stdin) && !feof(stdin))) {
  22.         printf("n/a\n");
  23.         return 1;
  24.     }
  25.  
  26.     double mean = calculate_mean(arr, size);
  27.     double sigma = sqrt(mean * (1 - mean)); // Для дискретного равномерного распределения
  28.  
  29.     for (int i = 0; i < size; i++) {
  30.         if (arr[i] != 0 && arr[i] >= mean && arr[i] <= (mean + 3 * sigma) && arr[i] >= (mean - 3 * sigma) && arr[i] % 2 == 0) {
  31.             printf("%d\n", arr[i]);
  32.             return 0;
  33.         }
  34.     }
  35.  
  36.     printf("0\n");
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/K3gBCY
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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