You are given two 2D integer arrays, items1 and items2, representing two sets of items. Each array items has the following properties:
items[i] = [valuei, weighti] where valuei represents the value and weighti represents the weight of the ith item.items is unique.Return a 2D integer array ret where ret[i] = [valuei, weighti], with weighti being the sum of weights of all items with value valuei.
Note: ret should be returned in ascending order by value.
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Example 1:
\n\n\nInput: items1 = [[1,1],[4,5],[3,8]], items2 = [[3,1],[1,5]]\nOutput: [[1,6],[3,9],[4,5]]\nExplanation: \nThe item with value = 1 occurs in items1 with weight = 1 and in items2 with weight = 5, total weight = 1 + 5 = 6.\nThe item with value = 3 occurs in items1 with weight = 8 and in items2 with weight = 1, total weight = 8 + 1 = 9.\nThe item with value = 4 occurs in items1 with weight = 5, total weight = 5. \nTherefore, we return [[1,6],[3,9],[4,5]].\n\n\n
Example 2:
\n\n\nInput: items1 = [[1,1],[3,2],[2,3]], items2 = [[2,1],[3,2],[1,3]]\nOutput: [[1,4],[2,4],[3,4]]\nExplanation: \nThe item with value = 1 occurs in items1 with weight = 1 and in items2 with weight = 3, total weight = 1 + 3 = 4.\nThe item with value = 2 occurs in items1 with weight = 3 and in items2 with weight = 1, total weight = 3 + 1 = 4.\nThe item with value = 3 occurs in items1 with weight = 2 and in items2 with weight = 2, total weight = 2 + 2 = 4.\nTherefore, we return [[1,4],[2,4],[3,4]].\n\n
Example 3:
\n\n\nInput: items1 = [[1,3],[2,2]], items2 = [[7,1],[2,2],[1,4]]\nOutput: [[1,7],[2,4],[7,1]]\nExplanation:\nThe item with value = 1 occurs in items1 with weight = 3 and in items2 with weight = 4, total weight = 3 + 4 = 7. \nThe item with value = 2 occurs in items1 with weight = 2 and in items2 with weight = 2, total weight = 2 + 2 = 4. \nThe item with value = 7 occurs in items2 with weight = 1, total weight = 1.\nTherefore, we return [[1,7],[2,4],[7,1]].\n\n\n
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Constraints:
\n\n1 <= items1.length, items2.length <= 1000items1[i].length == items2[i].length == 21 <= valuei, weighti <= 1000valuei in items1 is unique.valuei in items2 is unique.给你两个二维整数数组 items1 和 items2 ，表示两个物品集合。每个数组 items 有以下特质：
items[i] = [valuei, weighti] 其中 valuei 表示第 i 件物品的 价值 ，weighti 表示第 i 件物品的 重量 。items 中每件物品的价值都是 唯一的 。请你返回一个二维数组 ret，其中 ret[i] = [valuei, weighti]， weighti 是所有价值为 valuei 物品的 重量之和 。
注意：ret 应该按价值 升序 排序后返回。
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示例 1：
\n\n\n输入：items1 = [[1,1],[4,5],[3,8]], items2 = [[3,1],[1,5]]\n输出：[[1,6],[3,9],[4,5]]\n解释：\nvalue = 1 的物品在 items1 中 weight = 1 ，在 items2 中 weight = 5 ，总重量为 1 + 5 = 6 。\nvalue = 3 的物品再 items1 中 weight = 8 ，在 items2 中 weight = 1 ，总重量为 8 + 1 = 9 。\nvalue = 4 的物品在 items1 中 weight = 5 ，总重量为 5 。\n所以，我们返回 [[1,6],[3,9],[4,5]] 。\n\n\n
示例 2：
\n\n\n输入：items1 = [[1,1],[3,2],[2,3]], items2 = [[2,1],[3,2],[1,3]]\n输出：[[1,4],[2,4],[3,4]]\n解释：\nvalue = 1 的物品在 items1 中 weight = 1 ，在 items2 中 weight = 3 ，总重量为 1 + 3 = 4 。\nvalue = 2 的物品在 items1 中 weight = 3 ，在 items2 中 weight = 1 ，总重量为 3 + 1 = 4 。\nvalue = 3 的物品在 items1 中 weight = 2 ，在 items2 中 weight = 2 ，总重量为 2 + 2 = 4 。\n所以，我们返回 [[1,4],[2,4],[3,4]] 。\n\n
示例 3：
\n\n\n输入：items1 = [[1,3],[2,2]], items2 = [[7,1],[2,2],[1,4]]\n输出：[[1,7],[2,4],[7,1]]\n解释：\nvalue = 1 的物品在 items1 中 weight = 3 ，在 items2 中 weight = 4 ，总重量为 3 + 4 = 7 。\nvalue = 2 的物品在 items1 中 weight = 2 ，在 items2 中 weight = 2 ，总重量为 2 + 2 = 4 。\nvalue = 7 的物品在 items2 中 weight = 1 ，总重量为 1 。\n所以，我们返回 [[1,7],[2,4],[7,1]] 。\n\n\n
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提示：
\n\n1 <= items1.length, items2.length <= 1000items1[i].length == items2[i].length == 21 <= valuei, weighti <= 1000items1 中每个 valuei 都是 唯一的 。items2 中每个 valuei 都是 唯一的 。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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