Created
January 31, 2017 05:50
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| public static int rank(int key, int[] a){ | |
| // Array must be sorted. | |
| int lo = 0; | |
| int hi = a.length - 1; | |
| while (lo <= hi){ | |
| // Key is in a[lo..hi] or not present. | |
| int mid = lo + (hi - lo) / 2; | |
| if (key < a[mid]) hi = mid - 1; | |
| else if (key > a[mid]) lo = mid + 1; | |
| else return mid; | |
| } | |
| return -1; | |
| } |
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