Day5

167. Two Sum II - Input Array Is Sorted/167. Two Sum II - Input Array Is Sorted.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_167._Two_Sum_II___Input_Array_Is_Sorted</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

167. Two Sum II - Input Array Is Sorted/Program.cs

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+namespace _167._Two_Sum_II___Input_Array_Is_Sorted
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            var arr = new int[] { -2,-3,4 };
+            var res = new Solution().TwoSum(arr, -5);
+            Console.WriteLine(String.Join(" ", res));
+        }
+    }
+}

167. Two Sum II - Input Array Is Sorted/Solution.cs

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+namespace _167._Two_Sum_II___Input_Array_Is_Sorted;
+
+public class Solution
+{
+    public int[]? TwoSum(int[] numbers, int target)
+    {
+        for(int i = 0; i < numbers.Length; i++)
+        {
+            int cur = numbers[i];
+            int nextTar = target - cur;
+            int index = Search(numbers, nextTar);
+            if (i == index || index < 0 || index >= numbers.Length)
+                continue;
+            int val = numbers[index];
+            if (cur + val == target)
+            {
+                if(i>index)
+                {
+                    i = i + index;
+                    index = i - index;
+                    i = i - index;
+                }
+                return new int[] { i + 1, index + 1 };
+            }
+        }
+        return null;
+    }
+
+    public int Search(int[] nums, int target)
+    {
+        int l = -1;
+        int r = nums.Length;
+        while (l < r - 1)
+        {
+            int i = l + (r - l) / 2;
+            int cur = nums[i];
+            if (cur == target)
+                return i;
+            if (cur > target)
+                r = i;
+            else
+                l = i;
+        }
+        return -1;
+    }
+}