public static void main(String[] args) {
    	int v = 1;
    	int[] a = {1,2,3,4,5};
        int left = 0;
        int right = a.length - 1;
    	while (left <= right) {
    	    int mid = (left + right) / 2;
    	    if (a[mid] >= v) {
    	        right = mid - 1;
    	    } else {
    	        left = mid + 1;
    	    }
         }
    	System.out.println(left + 1);
}

  

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