\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \uff0c\u5224\u65ad\u662f\u5426\u5b58\u5728\u4e09\u5143\u7ec4 [nums[i], nums[j], nums[k]] \u6ee1\u8db3 i != j\u3001i != k \u4e14 j != k \uff0c\u540c\u65f6\u8fd8\u6ee1\u8db3 \u6ce8\u610f\uff1a\u7b54\u6848\u4e2d\u4e0d\u53ef\u4ee5\u5305\u542b\u91cd\u590d\u7684\u4e09\u5143\u7ec4\u3002<\/p>\n \u904d\u5386\u4e00\u6b21\u6570\u7ec4\uff0c\u5c06\u6240\u6709\u6570\u5b57\u653e\u5165\u54c8\u5e0c\u8868\uff0c\u540c\u65f6\u8bb0\u5f55\u6bcf\u4e2a\u6570\u5b57\u7684\u6570\u91cf \u5c06\u6570\u7ec4\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\u3002 \u4e3a\u4ec0\u4e48 j \u548c k \u53ea\u80fd\u5411\u5185\u4fa7\u79fb\u52a8\uff1f \u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \uff0c\u5224\u65ad\u662f\u5426\u5b58\u5728\u4e09\u5143\u7ec4 [nums[i], nums[j], nums[k […]<\/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":[75,51,73],"class_list":["post-867","post","type-post","status-publish","format-standard","hentry","category-algo","tag-75","tag-51","tag-73"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/867","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=867"}],"version-history":[{"count":2,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/867\/revisions"}],"predecessor-version":[{"id":869,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/867\/revisions\/869"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}nums[i] + nums[j] + nums[k] = 0<\/code> \u3002\u8bf7\u4f60\u8fd4\u56de\u6240\u6709\u548c\u4e3a 0 \u4e14\u4e0d\u91cd\u590d\u7684\u4e09\u5143\u7ec4\u3002<\/p>\n\u9898\u76ee\u5206\u6790<\/h1>\n
\u54c8\u5e0c\u8868+\u53bb\u91cd<\/h2>\n
\n\u679a\u4e3e\u4e0b\u6807 i \u548c j\uff0c\u5224\u65ad\u54c8\u5e0c\u8868\u4e2d\u662f\u5426\u5b58\u5728\u6570\u5b57\u503c\u4e3a-num[i]-num[j]<\/code>\uff0c\u4e14\u8981\u4fdd\u8bc1\u548c\u54c8\u5e0c\u8868\u8bb0\u5f55\u7684\u6570\u5b57\u6570\u91cf\u4e0d\u51b2\u7a81\uff0c\u5b58\u5728\u5219\u653e\u5165\u7ed3\u679c\u96c6\u5408\u4e2d\u3002\u7ed3\u679c\u96c6\u5408\u8981\u505a\u53bb\u91cd\u3002
\n\u65f6\u95f4\u590d\u6742\u5ea6O(n^2)<\/code><\/p>\n\u6392\u5e8f+\u53cc\u6307\u9488\uff08\u63a8\u8350\uff09<\/h2>\n
\n\u679a\u4e3e\u4e0b\u6807 i\uff0c\u679a\u4e3e\u65f6\u8981\u5224\u65ad\u662f\u5426\u548c i – 1 \u91cd\u590d
\n\u5c06 j \u521d\u59cb\u5316\u4e3a i+1<\/code>\uff0ck \u521d\u59cb\u5316\u4e3a nums.length - 1<\/code>
\n\u5224\u65ad\u4e09\u4e2a\u6570\u5b57\u4e4b\u548c sum\uff1a
\n– \u5927\u4e8e0: k \u5411\u5de6\u79fb\u52a8\u4e00\u4f4d
\n– \u5c0f\u4e8e0: j \u5411\u53f3\u79fb\u52a8\u4e00\u4f4d
\n– \u7b49\u4e8e0: \u653e\u5165\u7ed3\u679c\u96c6\u5408\u4e2d\u3002j++<\/code> \u6216 k--<\/code> \u90fd\u53ef\u4ee5\uff0c\u4f46\u8981\u4fdd\u8bc1\u548c\u8c03\u6574\u524d\u7684\u6570\u5b57\u4e0d\u91cd\u590d<\/p>\n
\n\u601d\u8003\u65f6\u8981\u4ece\u521d\u59cb\u72b6\u6001\u601d\u8003\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4ece\u4e2d\u95f4\u6001\u601d\u8003\u3002
\n\u5bf9\u4e8e\u521d\u59cb\u72b6\u6001\uff0cj \u5728\u5de6\u8fb9\u754c\uff0ck \u5728\u53f3\u8fb9\u754c\u3002\u4ee5 sum > 0 \u4e3a\u4f8b\uff0c\u5bf9\u4e8e k \u6765\u8bf4\uff0cj \u5df2\u7ecf\u662f\u5f53\u524d\u6570\u7ec4\u7684\u6700\u5c0f\u503c\uff0c\u56e0\u6b64\u65e0\u8bba\u540e\u7eed j \u79fb\u52a8\u5230\u54ea\u91cc\uff0csum \u90fd\u4f1a\u53d8\u5f97\u66f4\u5927\uff0c\u6b64\u523b k \u5bf9\u5e94\u7684\u6570\u5b57\u662f\u65e0\u7528\u7684\uff0c\u6240\u4ee5\u53ef\u4ee5\u5c06\u5b83\u5220\u9664\u3002\u5220\u9664\u540e\u7684\u65b0\u6570\u7ec4\uff0cj \u548c k \u4f9d\u7136\u662f\u5de6\u8fb9\u754c\u548c\u53f3\u8fb9\u754c\u3002\u4ee3\u7801\u91cc\u6ca1\u5fc5\u8981\u771f\u7684\u5220\u9664\uff0c\u800c\u662f\u9650\u5236\u6307\u9488\u53ea\u80fd\u5411\u5185\u4fa7\u79fb\u52a8\u3002
\n\u65f6\u95f4\u590d\u6742\u5ea6O(n^2)<\/code><\/p>\nJava<\/h1>\n
public List<List<Integer>> threeSum(int[] nums) {\n List<List<Integer>> result = new ArrayList<>();\n Arrays.sort(nums);\n for (int i = 0; i < nums.length; i++) {\n int j = i + 1;\n int k = nums.length - 1;\n if (nums[i] > 0) {\n break;\n }\n if (i > 0 && nums[i] == nums[i - 1]) {\n continue;\n }\n while (j < k) {\n int sum = nums[i] + nums[j] + nums[k];\n if (sum == 0) {\n result.add(Arrays.asList(nums[i], nums[j], nums[k]));\n int p = nums[j];\n while (j < k && nums[j] == p) {\n j++;\n }\n } else if (sum > 0) {\n k--;\n } else {\n j++;\n }\n }\n }\n return result;\n }\n<\/code><\/pre>\nKotlin<\/h1>\n
fun threeSum(nums: IntArray): List<List<Int>> {\n val result = ArrayList<List<Int>>()\n nums.sort()\n for (i in nums.indices) {\n var j = i + 1\n var k = nums.size - 1\n if (i > 0 && nums[i] == nums[i - 1]) {\n continue\n }\n if (nums[i] > 0) {\n break\n }\n\n while (j < k) {\n val sum = nums[i] + nums[j] + nums[k]\n if (sum == 0) {\n result.add(arrayListOf(nums[i], nums[j], nums[k]))\n val p = nums[j]\n while (j < k && nums[j] == p) {\n j++\n }\n } else if (sum > 0) {\n k--\n } else {\n j++\n }\n }\n }\n return result\n }\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"