题目又说不可以allocate另外一个列表来做,所以定义j来作为另一个pointer,如果num[i]!=num[j],则j+1,将num[i]的值赋给num[j], 如果相等,则继续i+1比较下一个元素,这样最后将j+1就是len2.RemoveElement: Given an array and a value, remove all instances of that value in-place and return the ne...
Jan 14 - 3 Sum Closest; Array; Two Pointer; 最原始的方法: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 publicclassSolution { publicintthreeSumClosest(int[] nums,inttarget) { intlen = nums.length; if(len <2)return0; inti =0; intsum =...
Two-pointer approach: We use two pointers (left and right) that start at the beginning and end of the array, respectively. These pointers move towards the center. At each step, we calculate whether the left or right side has a lower height. We only calculate trapped water on the side th...
If the two elements are the same, forward both pointers and put the element to the return array If the two elements are not the same, move the smaller one's pointer forward Keep doing the above two steps until it hit the end of any one of the arrays. class Solution: def intersect(se...
By using this strategy, we can efficiently eliminate duplicates from the sorted array without requiring any additional memory. The conditionnums[i] <= nums[i+1], inherent in the sorted nature of the array, facilitates the effectiveness of the two-pointer approach, leading to a more optimi...
In the above methods, we reverse the sections of the input array in-place, multiple times, to get the required result. For reversing the sections, we used the two-pointer approach where swapping of elements was done at both ends of the array section. Specifically, we first reverse all the...
HOME C Pointer Array Pointer Description Get the value of the first element in two dimensional array with pointer Demo Code#include <stdio.h> int main(void) { char board[3][3] = { {'1','2','3'}, {'4','5','6'}, {'7','8','9'} };/*from w w w . j av ...
low: this pointer will point to the index of the smallest element, in a sorted array it will be the first element of the array. high: this pointer will point to the index of the greatest element, in a sorted array it will be the last element of the array. ...
Let us do discuss the working of two pointer algorithm in brief which is as follows. The algorithm basically uses the fact that the input array is sorted. We start the sum of extreme values (smallest and largest) and conditionally move both pointers. We move left pointer ‘i’ when the ...
Two pointer approach: This is an iterative approach of problem solving which involve two pointers. We can solve several interview problems in array, linked list and string using this approach. Here are two varition of this approach : Two-pointer from the same side (Sliding Window). Two-po...