Merge pull request #1175 from Aditi22Bansal/main

Create 3181-Maximum total rewards using rewards II.md

Author: ajay-dhangar

dsa-solutions/lc-solutions/3100-3199/3181-Maximum total rewards using rewards II.md

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+---
+id: max-total-reward
+title: Maximum Total Reward Using Operations
+level: hard
+sidebar_label: Max Total Reward
+tags:
+- Dynamic Programming
+- Bit Manipulation
+- C++
+- Java
+- Python
+description: "This document provides solutions for finding the maximum total reward using dynamic programming and bit manipulation, implemented in C++, Java, and Python."
+---
+
+## Problem
+Given a list of reward values, the goal is to determine the maximum total reward that can be achieved using a series of operations.
+
+## Solution
+The problem is solved using dynamic programming and bit manipulation. The approach involves maintaining a bitset or similar data structure to track achievable reward values and iterating through the sorted reward values to update this structure.
+
+## Code in Different Languages
+
+### C++
+```cpp
+#include <vector>
+#include <bitset>
+#include <algorithm>
+#include <stdexcept>
+using namespace std;
+
+class Solution {
+ public:
+  int maxTotalReward(vector<int>& rewardValues) {
+    constexpr int kPossibleRewards = 100000;
+    bitset<kPossibleRewards> dp;
+    dp[0] = true;
+
+    sort(rewardValues.begin(), rewardValues.end());
+
+    for (const int num : rewardValues) {
+      bitset<kPossibleRewards> newBits = dp;
+      newBits <<= kPossibleRewards - num;
+      newBits >>= kPossibleRewards - num;
+      dp |= newBits << num;
+    }
+
+    for (int ans = kPossibleRewards - 1; ans >= 0; --ans)
+      if (dp[ans])
+        return ans;
+
+    throw runtime_error("Solution not found");
+  }
+};
+```
+
+### Java
+```java
+import java.math.BigInteger;
+import java.util.Arrays;
+
+class Solution {
+  public int maxTotalReward(int[] rewardValues) {
+    BigInteger one = BigInteger.ONE;
+    BigInteger dp = one; // the possible rewards (initially, 0 is achievable)
+
+    Arrays.sort(rewardValues);
+
+    for (final int num : rewardValues) {
+      BigInteger maskBitsLessThanNum = one.shiftLeft(num).subtract(one);
+      BigInteger bitsLessThanNum = dp.and(maskBitsLessThanNum);
+      dp = dp.or(bitsLessThanNum.shiftLeft(num));
+    }
+
+    return dp.bitLength() - 1;
+  }
+}
+```
+
+### Python
+```python
+from typing import List
+
+class Solution:
+  def maxTotalReward(self, rewardValues: List[int]) -> int:
+    dp = 1  # the possible rewards (initially, 0 is achievable)
+
+    for num in sorted(rewardValues):
+      smallerNums = dp & ((1 << num) - 1)
+      dp |= smallerNums << num
+
+    return dp.bit_length() - 1
+
+# Example usage
+sol = Solution()
+rewardValues = [1, 2, 3, 5]
+print(sol.maxTotalReward(rewardValues))  # Output: 10
+```
+
+# Complexity Analysis
+## Time Complexity:
+$O(n * k)$, where n is the number of reward values and k is the maximum possible reward value. Sorting the reward values takes O(n log n) time, and each bit manipulation operation is efficient.
+
+## Space Complexity: 
+$O(k)$
+Reason: The bitset or similar structure requires space proportional to the maximum possible reward value.