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  1.  
  2. #include <stdio.h>
  3. int main() {
  4.     int arr[] = {1,3,5,7,9};
  5. int l = 0, r = 4, x = 6, ans = -1;
  6. while (l <= r) {
  7.     int m = (l + r) / 2;
  8.     if (arr[m] < x) l = m + 1;
  9.     else if (arr[m] > x) r = m - 1;
  10.     else { ans = m; break; }
  11. }
  12. printf("%d\n", ans);
  13.  
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5296KB
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Standard input is empty
stdout
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-1
https://ideone.com/Xsqssr
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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