416 Partition Equal Subset Sum 分割相同子集和

详见：https://leetcode.com/problems/partition-equal-subset-sum/description/

C++：

class Solution {
public:
    bool canPartition(vector<int>& nums)
    {
        int sum = accumulate(nums.begin(), nums.end(), 0);
        if (sum % 2 == 1)
        {
            return false;
        }
        int target = sum / 2;
        vector<bool> dp(target + 1, false);
        dp[0] = true;
        for (int i = 0; i < nums.size(); ++i)
        {
            for (int j = target; j >= nums[i]; --j)
            {
                dp[j] = dp[j] || dp[j - nums[i]];
            }
        }
        return dp.back();
    }
};

参考：http://www.cnblogs.com/grandyang/p/5951422.html