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krahets
2023-04-23 14:58:03 +08:00
parent 881ece517f
commit fe8027e64a
26 changed files with 344 additions and 626 deletions
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chapter_searching/replace_linear_by_hashing.md
+6 -12
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@@ -145,14 +145,11 @@ comments: true
```csharp title="leetcode_two_sum.cs"
/* 方法一：暴力枚举 */
int[] twoSumBruteForce(int[] nums, int target)
{
int[] twoSumBruteForce(int[] nums, int target) {
int size = nums.Length;
// 两层循环，时间复杂度 O(n^2)
for (int i = 0; i < size - 1; i++)
{
for (int j = i + 1; j < size; j++)
{
for (int i = 0; i < size - 1; i++) {
for (int j = i + 1; j < size; j++) {
if (nums[i] + nums[j] == target)
return new int[] { i, j };
}
@@ -372,16 +369,13 @@ comments: true
```csharp title="leetcode_two_sum.cs"
/* 方法二：辅助哈希表 */
int[] twoSumHashTable(int[] nums, int target)
{
int[] twoSumHashTable(int[] nums, int target) {
int size = nums.Length;
// 辅助哈希表，空间复杂度 O(n)
Dictionary<int, int> dic = new();
// 单层循环，时间复杂度 O(n)
for (int i = 0; i < size; i++)
{
if (dic.ContainsKey(target - nums[i]))
{
for (int i = 0; i < size; i++) {
if (dic.ContainsKey(target - nums[i])) {
return new int[] { dic[target - nums[i]], i };
}
dic.Add(nums[i], i);