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  1. /*Given a sequence of N integers. Find whether it is an Arithmetic sequence or not. An arithmetic sequence is a sequence of numbers where the difference between any two consecutive numbers is always the same. For example:
  2.  
  3. [5, 8, 11, 14] is an arithmetic sequence because the difference between consecutive terms is always +3.
  4. [9, 5, 1, -3] is an arithmetic sequence because the difference between consecutive terms is always -4.
  5. [2, 5, 7, 10] is not an arithmetic sequence because the differences between consecutive terms are +3, +2, +3.
  6. [3, 6, 3] is not an arithmetic sequence because the differences between consecutive terms are +3, -3.
  7. Input Format
  8.  
  9. One integer N, the size of the sequence. Followed by N integer numbers, aka the sequence.
  10.  
  11. Constraints
  12.  
  13.  
  14. Output Format
  15.  
  16. Print "YES" (without quotation), if the sequence is an arithmatic sequence.
  17. Otherwise print "NO" (without quotation).*/
  18.  
  19. #include<stdio.h>
  20. int main()
  21. {
  22.     int n,i,current,previous,difference;
  23.     int arithmetic=1;
  24.     scanf("%d",&n);
  25.      if(n<2)
  26.       {
  27.         printf("NO\n");
  28.         return 0;
  29.       }
  30.     scanf("%d %d",&previous,&current);
  31.     difference = current-previous;
  32.      for(i=2;i<n;i++)
  33.       {
  34.         previous=current;
  35.         scanf("%d",&current);
  36.         if(current-previous!=difference)
  37.          {
  38.             arithmetic=0;
  39.  
  40.          }
  41.  
  42.  
  43.       }
  44.     if(arithmetic)
  45.     {printf("YES\n");}
  46.     else{
  47.         printf("NO\n");
  48.     } 
  49.  
  50. return 0;
  51. }
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
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NO
https://ideone.com/Uq2Mhc
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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