Merge pull request #2409 from eeee0717/master

Update 0062.不同路径，添加C#

problems/0062.不同路径.md

@@ -536,8 +536,29 @@ object Solution {
 ```
 
 ### c#
+```csharp
+// 二维数组
+public class Solution
+{
+    public int UniquePaths(int m, int n)
+    {
+        int[,] dp = new int[m, n];
+        for (int i = 0; i < m; i++) dp[i, 0] = 1;
+        for (int j = 0; j < n; j++) dp[0, j] = 1;
+        for (int i = 1; i < m; i++)
+        {
+            for (int j = 1; j < n; j++)
+            {
+                dp[i, j] = dp[i - 1, j] + dp[i, j - 1];
+            }
+        }
+        return dp[m - 1, n - 1];
+    }
+}
+```
 
 ```csharp
+// 一维数组
 public class Solution
 {
     public int UniquePaths(int m, int n)

problems/0063.不同路径II.md

@@ -734,6 +734,30 @@ object Solution {
   }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int UniquePathsWithObstacles(int[][] obstacleGrid)
+    {
+        int m = obstacleGrid.Length;
+        int n = obstacleGrid[0].Length;
+        int[,] dp = new int[m, n];
+        if (obstacleGrid[0][0] == 1 || obstacleGrid[m - 1][n - 1] == 1) return 0;
+        for (int i = 0; i < m && obstacleGrid[i][0] == 0; i++) dp[i, 0] = 1;
+        for (int j = 0; j < n && obstacleGrid[0][j] == 0; j++) dp[0, j] = 1;
+        for (int i = 1; i < m; i++)
+        {
+            for (int j = 1; j < n; j++)
+            {
+                if (obstacleGrid[i][j] == 1) continue;
+                dp[i, j] = dp[i - 1, j] + dp[i, j - 1];
+            }
+        }
+        return dp[m - 1, n - 1];
+    }
+}
+```
 
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problems/0096.不同的二叉搜索树.md

@@ -328,6 +328,25 @@ object Solution {
   }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int NumTrees(int n)
+    {
+        int[] dp = new int[n + 1];
+        dp[0] = 1;
+        for (int i = 1; i <= n; i++)
+        {
+            for (int j = 1; j <= i; j++)
+            {
+                dp[i] += dp[j - 1] * dp[i - j];
+            }
+        }
+        return dp[n];
+    }
+}
+```
 
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problems/0343.整数拆分.md

@@ -496,6 +496,25 @@ class Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int IntegerBreak(int n)
+    {
+        int[] dp = new int[n + 1];
+        dp[2] = 1;
+        for (int i = 3; i <= n; i++)
+        {
+            for (int j = 1; j <= i / 2; j++)
+            {
+                dp[i] = Math.Max(dp[i],Math.Max(j*(i-j),j*dp[i-j]));
+            }
+        }
+        return dp[n];
+    }
+}
+```
 
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problems/0377.组合总和Ⅳ.md

@@ -312,6 +312,28 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int CombinationSum4(int[] nums, int target)
+    {
+        int[] dp = new int[target + 1];
+        dp[0] = 1;
+        for (int i = 0; i <= target; i++)
+        {
+            for (int j = 0; j < nums.Length; j++)
+            {
+                if (i >= nums[j] && dp[i] < int.MaxValue - dp[i - nums[j]])
+                {
+                    dp[i] += dp[i - nums[j]];
+                }
+            }
+        }
+        return dp[target];
+    }
+}
+```
 
 
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problems/0416.分割等和子集.md

@@ -726,7 +726,35 @@ object Solution {
   }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public bool CanPartition(int[] nums)
+    {
+        int sum = 0;
+        int[] dp = new int[10001];
+        foreach (int num in nums)
+        {
+            sum += num;
+        }
+        if (sum % 2 == 1) return false;
+        int tartget = sum / 2;
+        for (int i = 0; i < nums.Length; i++)
+        {
+            for (int j = tartget; j >= nums[i]; j--)
+            {
+                dp[j] = Math.Max(dp[j], dp[j - nums[i]] + nums[i]);
+            }
+        }
+        if (dp[tartget] == tartget)
+            return true;
 
+        return false;
+
+    }
+}
+```
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problems/0474.一和零.md

@@ -533,6 +533,33 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int FindMaxForm(string[] strs, int m, int n)
+    {
+        int[,] dp = new int[m + 1, n + 1];
+        foreach (string str in strs)
+        {
+            int zero = 0, one = 0;
+            foreach (char c in str)
+            {
+                if (c == '0') zero++;
+                else one++;
+            }
+            for (int i = m; i >= zero; i--)
+            {
+                for (int j = n; j >= one; j--)
+                {
+                    dp[i, j] = Math.Max(dp[i, j], dp[i - zero, j - one] + 1);
+                }
+            }
+        }
+        return dp[m, n];
+    }
+}
+```
 
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problems/0494.目标和.md

@@ -585,6 +585,33 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int FindTargetSumWays(int[] nums, int target)
+    {
+        int sum = 0;
+        foreach (int num in nums)
+        {
+            sum += num;
+        }
+        if (Math.Abs(target) > sum) return 0;
+        if ((sum + target) % 2 == 1) return 0;
+        int bagSize = (sum + target) / 2;
+        int[] dp = new int[bagSize + 1];
+        dp[0] = 1;
+        for (int i = 0; i < nums.Length; i++)
+        {
+            for (int j = bagSize; j >= nums[i]; j--)
+            {
+                dp[j] += dp[j - nums[i]];
+            }
+        }
+        return dp[bagSize];
+    }
+}
+```
 
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problems/0518.零钱兑换II.md

@@ -347,6 +347,26 @@ object Solution {
   }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int Change(int amount, int[] coins)
+    {
+        int[] dp = new int[amount + 1];
+        dp[0] = 1;
+        for (int i = 0; i < coins.Length; i++)
+        {
+            for (int j = coins[i]; j <= amount; j++)
+            {
+                if (j >= coins[i])
+                    dp[j] += dp[j - coins[i]];
+            }
+        }
+        return dp[amount];
+    }
+}
+```
 
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problems/1049.最后一块石头的重量II.md

@@ -472,6 +472,30 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int LastStoneWeightII(int[] stones)
+    {
+        int[] dp = new int[15001];
+        int sum = 0;
+        foreach (int stone in stones)
+        {
+            sum += stone;
+        }
+        int target = sum / 2;
+        for (int i = 0; i < stones.Length; i++)
+        {
+            for (int j = target; j >= stones[i]; j--)
+            {
+                dp[j] = Math.Max(dp[j], dp[j - stones[i]] + stones[i]);
+            }
+        }
+        return sum - 2 * dp[target];
+    }
+}
+```
 
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