{"id":898,"date":"2025-10-24T17:57:28","date_gmt":"2025-10-24T09:57:28","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=898"},"modified":"2025-10-24T17:57:28","modified_gmt":"2025-10-24T09:57:28","slug":"leetcode-238-%e9%99%a4%e8%87%aa%e8%ba%ab%e4%bb%a5%e5%a4%96%e6%95%b0%e7%bb%84%e7%9a%84%e4%b9%98%e7%a7%af","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=898","title":{"rendered":"LeetCode 238 \u2013 \u9664\u81ea\u8eab\u4ee5\u5916\u6570\u7ec4\u7684\u4e58\u79ef"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums\uff0c\u8fd4\u56de \u6570\u7ec4 answer \uff0c\u5176\u4e2d answer[i] \u7b49\u4e8e nums \u4e2d\u9664 nums[i] \u4e4b\u5916\u5176\u4f59\u5404\u5143\u7d20\u7684\u4e58\u79ef \u3002<\/p>\n

\u9898\u76ee\u6570\u636e \u4fdd\u8bc1 \u6570\u7ec4 nums\u4e4b\u4e2d\u4efb\u610f\u5143\u7d20\u7684\u5168\u90e8\u524d\u7f00\u5143\u7d20\u548c\u540e\u7f00\u7684\u4e58\u79ef\u90fd\u5728 32 \u4f4d \u6574\u6570\u8303\u56f4\u5185\u3002<\/p>\n

\u8bf7 \u4e0d\u8981\u4f7f\u7528\u9664\u6cd5\uff0c\u4e14\u5728 O(n) \u65f6\u95f4\u590d\u6742\u5ea6\u5185\u5b8c\u6210\u6b64\u9898\u3002<\/p>\n

\u793a\u4f8b 1:<\/p>\n

\u8f93\u5165: nums = [1,2,3,4]
\n\u8f93\u51fa: [24,12,8,6]<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u5f00\u4e24\u4e2a\u6570\u7ec4\u5206\u522b\u5b58\u50a8\u524d\u7f00\u79ef\u548c\u540e\u7f00\u79ef
\n\u65f6\u95f4\u590d\u6742\u5ea6 O(n), \u7a7a\u95f4\u590d\u6742\u5ea6 O(n)<\/p>\n

\u8fdb\u9636\uff1a
\n\u53ef\u4ee5\u501f\u52a9 ans \u6570\u7ec4\u5b9e\u73b0\u524d\u7f00\u79ef\u7684\u6682\u5b58
\n\u4e0d\u8003\u8651 ans \u6570\u7ec4\u7684\u7a7a\u95f4\uff0c\u6b64\u65f6\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a O(1)<\/p>\n

Java<\/h1>\n
public int[] productExceptSelf1(int[] nums) {\n    int n = nums.length;\n    int[] left = new int[n];\n    int[] right = new int[n];\n    int[] ans = new int[n];\n    left[0] = nums[0];\n    for (int i = 1; i < n; i++) {\n        left[i] = nums[i] * left[i - 1];\n    }\n    right[n - 1] = nums[n - 1];\n    for (int i = n - 2; i >= 0; i--) {\n        right[i] = nums[i] * right[i + 1];\n    }\n    for (int i = 1; i < n - 1; i++) {\n        ans[i] = left[i - 1] * right[i + 1];\n    }\n    ans[0] = right[1];\n    ans[n - 1] = left[n - 2];\n    return ans;\n}\n\npublic int[] productExceptSelf2(int[] nums) {\n    int n = nums.length;\n    int[] ans = new int[n];\n\n    \/\/ \u524d\u7f00\u79ef\n    ans[0] = 1;\n    int temp = 1;\n    for (int i = 1; i < n; i++) {\n        temp *= nums[i - 1];\n        ans[i] = temp;\n    }\n\n    \/\/ \u540e\u7f00\u79ef\n    temp = 1;\n    for (int i = n - 2; i >= 0; i--) {\n        temp *= nums[i + 1];\n        ans[i] *= temp;\n    }\n\n    return ans;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
fun productExceptSelf(nums: IntArray): IntArray {\n    val n = nums.size\n    val ans = IntArray(n)\n    var temp = 1\n    ans[0] = 1\n    for (i in 1..n - 1) {\n        temp *= nums[i - 1]\n        ans[i] = temp\n    }\n\n    temp = 1\n    for (i in n - 2 downTo 0) {\n        temp *= nums[i + 1]\n        ans[i] *= temp\n    }\n    return ans\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums\uff0c\u8fd4\u56de \u6570\u7ec4 answer \uff0c\u5176\u4e2d answer[i] \u7b49\u4e8e nums \u4e2d […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,78,73],"class_list":["post-898","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-78","tag-73"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=898"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/898\/revisions"}],"predecessor-version":[{"id":899,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/898\/revisions\/899"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}