Merge Sorted Array
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Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.
Note:
You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2. The number of elements initialized in nums1 andnums2 are m and n respectively.
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Tags
Array, Two Pointers
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Merge from the last
/** * @param {number[]} nums1 * @param {number} m * @param {number[]} nums2 * @param {number} n * @return {void} Do not return anything, modify nums1 in-place instead. */var merge = function (nums1, m, nums2, n) { // sort from the back // last index is m+n-1 while (m > 0 && n > 0) { if (nums2[n - 1] >= nums1[m - 1]) { nums1[m + n - 1] = nums2[n - 1]; n--; } else { nums1[m + n - 1] = nums1[m - 1]; m--; } } while (n > 0) { nums1[m + n - 1] = nums2[n - 1]; n--; }};
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