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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main()
  5. {
  6.     int n1, n2, n3, k1, k2, i, j;
  7.     scanf("%d %d", &n1, &n2);
  8.     int tab1[n1];
  9.     for(i = 0; i < n1; i++) 
  10.     	scanf("%d", &tab1[i]);
  11.     for(i = 0; i < n2; i++)
  12.     {
  13.         scanf("%d", &n3);
  14.         k1 = (n1 - 1) / 2;
  15.         k2 = k1;
  16.         j = 1;
  17.  
  18.         while(1)
  19.         {
  20.             if(n3 == tab1[k1])
  21.             	break;
  22.             else if(n3 > tab1[k1])
  23.             	k1 += ceil(k1 / pow(2, j));
  24.             else 
  25.             	k1 -= ceil(k1 / pow(2, j));
  26.  
  27.             if(k1 == k2)
  28.             	break;
  29.             k2 = k1;
  30.             j++;
  31.         }
  32.  
  33.         if(n3 == tab1[k1])
  34.         {
  35.             while(n3 == tab1[k1] && k1 > 0) k1--;
  36.             if(tab1[0] == n3) printf("0\n");
  37.             else printf("%d\n", k1 + 1);
  38.         }
  39.         else printf("-1\n");
  40.     }
  41.  
  42.  
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0s 4196KB
comments (?)
stdin 
6 18
0 10 20 30 40 50
-1 0 1 9 10 11 19 20 21 29 30 31 39 40 41 49 50 2000000000
stdout 
-1
0
-1
-1
1
-1
-1
2
-1
-1
3
-1
-1
4
-1
-1
5
15
https://ideone.com/pP5WRn
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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