javascript: 合并数组

 

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// 1.2 空间复杂度 来源:  JavaScript算法  作者: 司徒正美,李晓晨著,人民邮电出版社,2023
// ,空间复杂度(space complexity)是对一个算法在运行过程中临时占用存储空间大小的量度。
// 给定一个整数数组nums和一个整数目标值target,请你在该数组中找出“和”为目标值target的那两个整数,并返回它们的数组下标
// 方法一:暴力枚举 时间复杂度为O(n2) 空间复杂度为O(1) 采用“就地”存储
var nums=[4,0,2,9];
var target=[4];
		
function twoSum(nums, target) {
	console.log(nums);
	console.log(target);
    for (let i = 0; i < nums.length; i++) {
      for (let j = i + 1; j < nums.length; j++) {
        if (target - nums[i] === nums[j]) {
			console.log(nums[i]);
          return [i, j];
        }
      }
    }
    console.log("No two sum1 solution");
};
		
//var twoSum =	
var sum1=twoSum(nums, target);	
console.log("数:"+sum1);	
		
// 方法二:散列表 散列表进行元素存储 消耗的空间复杂度为O(n) 时间复杂度的消耗,此处为O(n)。
		//var twoSum2 = 
function twoSum2(nums, target) {
	console.log(nums);
	console.log(target);
    var map = new Map();
    for (let i = 0; i < nums.length; i++) {
      let complement = target - nums[i];
      if (map.has(complement)) {
		  console.log(i);
        return [map.get(complement), i];
      }
      map.set(nums[i], i);
    }
    console.log("No two sum2 solution");
};
//var twoSum2=
var sum2=twoSum2(nums, target);
console.log("数:"+sum2);
		
		
var src = [1,1,2,1,4,1,3,5,7,9];        
var dest = [2,4,6,8,10,12];
function mergeArray(src, dest, n, m) {
  var indexOfNew = n + m - 1; // 新数组的末位索引
  var indexOfSrc = n - 1; // src有效元素的末位索引
  var indexOfDest = m - 1; // dest有效元素的末位索引
  // 当dest全部扫描完成,元素全部插入src,剩余src元素不需要移位操作
  // 当src全部遍历完成,但dest仍有元素时,只需要操作dest即可,此时src下标已达最小值0
  while (indexOfDest >= 0) {
    if (indexOfSrc >= 0) {
      // 将src或dest中较大的元素放入src的后几位中去
      if (src[indexOfSrc] >= dest[indexOfDest]) {
        src[indexOfNew] = src[indexOfSrc];
        --indexOfNew;
        --indexOfSrc;
      } else {
        src[indexOfNew] = dest[indexOfDest];
        --indexOfNew;
        --indexOfDest;
      }
    } else { // 如果dest比较长,那么挪动dest到indexOfNew位置上
      src[indexOfNew] = dest[indexOfDest];
      --indexOfNew;
      --indexOfDest;
    }
  }
}
mergeArray(src,dest,10,6);		
console.log("合并的数组:"+src);	
	
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posted @ 2023-10-20 17:27  ®Geovin Du Dream Park™  阅读(8)  评论(0编辑  收藏  举报