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| class Solution {
public int[] maxNumber(int[] nums1, int[] nums2, int k) {
int m = nums1.length, n = nums2.length;
int[] maxSubsequence = new int[k];
int start = Math.max(0, k - n), end = Math.min(k, m);
for (int i = start; i <= end; i++) {
int[] subsequence1 = maxSubsequence(nums1, i);
int[] subsequence2 = maxSubsequence(nums2, k - i);
int[] curMaxSubsequence = merge(subsequence1, subsequence2);
if (compare(curMaxSubsequence, 0, maxSubsequence, 0) > 0) {
System.arraycopy(curMaxSubsequence, 0, maxSubsequence, 0, k);
}
}
return maxSubsequence;
}
public int[] maxSubsequence(int[] nums, int k) {
int length = nums.length;
int[] stack = new int[k];
int top = -1;
int remain = length - k;
for (int i = 0; i < length; i++) {
int num = nums[i];
while (top >= 0 && stack[top] < num && remain > 0) {
top--;
remain--;
}
if (top < k - 1) {
stack[++top] = num;
} else {
remain--;
}
}
return stack;
}
public int[] merge(int[] subsequence1, int[] subsequence2) {
int x = subsequence1.length, y = subsequence2.length;
if (x == 0) {
return subsequence2;
}
if (y == 0) {
return subsequence1;
}
int mergeLength = x + y;
int[] merged = new int[mergeLength];
int index1 = 0, index2 = 0;
for (int i = 0; i < mergeLength; i++) {
if (compare(subsequence1, index1, subsequence2, index2) > 0) {
merged[i] = subsequence1[index1++];
} else {
merged[i] = subsequence2[index2++];
}
}
return merged;
}
public int compare(int[] subsequence1, int index1, int[] subsequence2, int index2) {
int x = subsequence1.length, y = subsequence2.length;
while (index1 < x && index2 < y) {
int difference = subsequence1[index1] - subsequence2[index2];
if (difference != 0) {
return difference;
}
index1++;
index2++;
}
return (x - index1) - (y - index2);
}
}
|