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题目：

题解：

class Solution {public int findTargetSumWays(int[] nums, int target) {int sum = 0;for (int num : nums) {sum += num;}int diff = sum - target;if (diff < 0 || diff % 2 != 0) {return 0;}int neg = diff / 2;int[] dp = new int[neg + 1];dp[0] = 1;for (int num : nums) {for (int j = neg; j >= num; j--) {dp[j] += dp[j - num];}}return dp[neg];}
}