Create partition-equal-subset-sum.cpp

Author: kamyu104

C++/partition-equal-subset-sum.cpp

@@ -0,0 +1,23 @@
+// Time:  O(n * s), s is the sum of nums.
+// Space: O(s)
+
+class Solution {
+public:
+    bool canPartition(vector<int>& nums) {
+       const auto sum = accumulate(nums.cbegin(), nums.cend(), 0);
+       if (sum % 2) {
+           return false;
+       }
+       
+       vector<bool> dp(sum / 2 + 1);
+       dp[0]  = true;
+       for (const auto& num : nums) {
+           for (int i = 1; i < dp.size(); ++i) {
+               if (num <= i) {
+                   dp[i] = dp[i] || dp[i - num];
+               }
+           }
+       }
+       return dp.back();
+    }
+};