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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. int main() {
  4.   int n, err = 0, sum = 0;
  5.   if (scanf("%d", &n) == 1) {
  6.     char ch;
  7.     ch = getchar();
  8.     if (ch == ' ' || ch == '\n' || ch == '\0') {
  9.       int *vector = (int *)malloc(n * 2 * sizeof(int));
  10.       for (int i = 0; i < n * 2; i++) {
  11.         if (scanf("%d", &vector[i]) == 1) {
  12.           char ch;
  13.           ch = getchar();
  14.           if (i < 2 * n - 1) {
  15.             if (ch == ' ' || ch == '\n' || ch == '\0') {
  16.             } else {
  17.               err = 1;
  18.             }
  19.           } else {
  20.             if (ch == ' ' || ch == '\n' || ch == '\0' || ch == EOF) {
  21.             } else {
  22.               err = 1;
  23.             }
  24.           }
  25.         } else {
  26.           err = 1;
  27.         }
  28.       }
  29.       for (int i = 0; i < n; i++) {
  30.         sum += vector[i] * vector[i + n];
  31.       }
  32.  
  33.       free(vector);
  34.     } else {
  35.       err = 1;
  36.     }
  37.   } else {
  38.     err = 1;
  39.   }
  40.   if (err == 0) {
  41.     printf("%d", sum);
  42.   } else if (err == 1) {
  43.     printf("n/a");
  44.   }
  45.   return 0;
  46. }
  47.  
Success #stdin #stdout 0s 5648KB
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stdin
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Standard input is empty
stdout
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n/a
https://ideone.com/yLjBfH
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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