Leetcode 之 Median of Two Sorted Arrays

C语言版

double find_kth(int* nums1, int nums1Size, int* nums2, int nums2Size, int k, int c) {
    if (0 == nums1Size) {
        if (0 == c) return nums2[k - 1];
        else return (nums2[k - 1] + nums2[k]) / 2.0;
    }
    if (0 == nums2Size) {
        if (0 == c) return nums1[k - 1];
        else return (nums1[k - 1] + nums1[k]) / 2.0;
    }
    if (k == 1) {
        if (*nums1 < *nums2) {
            if (0 == c) return *nums1;
            else return (*nums1 + find_kth(nums1 + 1, nums1Size - 1, nums2, nums2Size, 1, 0)) / 2.0;
        }
        else {
            if (0 == c) return *nums2;
            else return (*nums2 + find_kth(nums1, nums1Size, nums2 + 1, nums2Size - 1, 1, 0)) / 2.0;
        }
    }
    int i1 = k / 2 - 1;
    if (i1 >= nums1Size) i1 = nums1Size - 1;
    int i2 = k - 2 - i1;
    if (i2 >= nums2Size) {
        i2 = nums2Size - 1;
        i1 = k - 2 - i2;
    }
    if (nums1[i1] == nums2[i2]) {
        if (0 == c) return nums1[i1];
        else return (nums1[i1] + find_kth(nums1 + i1 + 1, nums1Size - i1 - 1, nums2 + i2 + 1, nums2Size - i2 - 1, 1, 0)) / 2.0;
    }
    else if (nums1[i1] < nums2[i2]) {
        return find_kth(nums1 + i1 + 1, nums1Size - i1 - 1, nums2, nums2Size, k - i1 - 1, c);
    }
    else {
        return find_kth(nums1, nums1Size, nums2 + i2 + 1, nums2Size - i2 - 1, k - i2 - 1, c);
    }
}

double findMedianSortedArrays(int* nums1, int nums1Size, int* nums2, int nums2Size) {
    if (0 == ((nums1Size + nums2Size) & 0x1))
    return find_kth(nums1, nums1Size, nums2, nums2Size, (nums1Size + nums2Size) / 2    , 1);
    return find_kth(nums1, nums1Size, nums2, nums2Size, (nums1Size + nums2Size) / 2 + 1, 0);
}
时间： 2024-08-01 22:39:20

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