{"id":990,"date":"2025-12-17T05:54:30","date_gmt":"2025-12-16T21:54:30","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=990"},"modified":"2025-12-17T06:16:48","modified_gmt":"2025-12-16T22:16:48","slug":"leetcode-33-%e6%90%9c%e7%b4%a2%e6%97%8b%e8%bd%ac%e6%8e%92%e5%ba%8f%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=990","title":{"rendered":"LeetCode 33 – \u641c\u7d22\u65cb\u8f6c\u6392\u5e8f\u6570\u7ec4"},"content":{"rendered":"

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

\u6574\u6570\u6570\u7ec4 nums \u6309\u5347\u5e8f\u6392\u5217\uff0c\u6570\u7ec4\u4e2d\u7684\u503c \u4e92\u4e0d\u76f8\u540c \u3002
\n\u5728\u4f20\u9012\u7ed9\u51fd\u6570\u4e4b\u524d\uff0cnums \u5728\u9884\u5148\u672a\u77e5\u7684\u67d0\u4e2a\u4e0b\u6807 k\uff080 <= k < nums.length\uff09\u4e0a\u8fdb\u884c\u4e86 \u5411\u5de6\u65cb\u8f6c\uff0c\u4f7f\u6570\u7ec4\u53d8\u4e3a [nums[k], nums[k+1], …, nums[n-1], nums[0], nums[1], …, nums[k-1]]\uff08\u4e0b\u6807 \u4ece 0 \u5f00\u59cb \u8ba1\u6570\uff09\u3002\u4f8b\u5982\uff0c [0,1,2,4,5,6,7] \u4e0b\u6807 3 \u4e0a\u5411\u5de6\u65cb\u8f6c\u540e\u53ef\u80fd\u53d8\u4e3a [4,5,6,7,0,1,2] \u3002
\n\u7ed9\u4f60 \u65cb\u8f6c\u540e \u7684\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u6574\u6570 target \uff0c\u5982\u679c nums \u4e2d\u5b58\u5728\u8fd9\u4e2a\u76ee\u6807\u503c target \uff0c\u5219\u8fd4\u56de\u5b83\u7684\u4e0b\u6807\uff0c\u5426\u5219\u8fd4\u56de -1 \u3002
\n\u4f60\u5fc5\u987b\u8bbe\u8ba1\u4e00\u4e2a\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(log n) \u7684\u7b97\u6cd5\u89e3\u51b3\u6b64\u95ee\u9898\u3002<\/p>\n

\u793a\u4f8b\uff1a
\n\u8f93\u5165\uff1anums = [4,5,6,7,0,1,2], target = 0
\n\u8f93\u51fa\uff1a4<\/p>\n

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

\u533a\u95f4\u5224\u65ad<\/h2>\n

\u4e8c\u5206\u67e5\u627e\uff0c\u5bf9\u4e8emid\u6765\u8bf4\uff0c\u81f3\u5c11\u6709\u4e00\u4fa7\u662f\u8fde\u7eed\u533a\u95f4\u3002
\n\u5982\u679c\u53f3\u4fa7\u8fde\u7eed\uff0c\u4e14target\u5728\u53f3\u533a\u95f4\u7684\u8303\u56f4\u5185\uff0c\u5219\u8f6c\u81f3\u53f3\u533a\u95f4\uff0c\u5426\u5219\u8f6c\u81f3\u5de6\u533a\u95f4\u3002
\n\u5982\u679c\u5de6\u4fa7\u8fde\u7eed\uff0c\u4e14target\u5728\u5de6\u533a\u95f4\u7684\u8303\u56f4\u5185\uff0c\u5219\u8f6c\u81f3\u5de6\u533a\u95f4\uff0c\u5426\u5219\u8f6c\u81f3\u53f3\u533a\u95f4\u3002<\/p>\n

\u627e\u5230\u6700\u5c0f\u503c<\/h2>\n

\u5148\u8fdb\u884c\u4e00\u6b21\u4e8c\u5206\uff0c\u627e\u5230\u6700\u5de6\u4fa7\u6bd4 nums[0] \u5c0f\u7684\u6570\u5b57\uff0c\u4f4d\u7f6e p\u3002
\n\u518d\u8fdb\u884c\u4e00\u6b21\u4e8c\u5206\uff0c\u5728 [p, p + nums.length)<\/code> \u8303\u56f4\u5185\u67e5\u627etarget.<\/p>\n

Java<\/h1>\n
public int search(int[] nums, int target) {\n    int left = 0, right = nums.length - 1;\n    while (left <= right) {\n        int mid = (left + right) \/ 2;\n        if (nums[mid] == target) {\n            return mid;\n        }\n        if (mid + 1 <= right && nums[mid + 1] <= nums[right]) { \/\/ \u53f3\u4fa7\u8fde\u7eed\n            if (nums[mid + 1] <= target && target <= nums[right]) { \/\/ \u53f3\u533a\u95f4\n                left = mid + 1;\n            } else {\n                right = mid - 1;\n            }\n        } else { \/\/ \u5de6\u4fa7\u8fde\u7eed\n            if (mid - 1 >= left && nums[mid - 1] >= target && target >= nums[left]) { \/\/ \u5de6\u533a\u95f4\n                right = mid - 1;\n            } else {\n                left = mid + 1;\n            }\n        }\n    }\n    return -1;\n}\n\npublic int search2(int[] nums, int target) {\n    int left = 0, right = nums.length - 1;\n    int p = 0;\n    while (left <= right) {\n        int mid = (left + right) \/ 2;\n        if (nums[mid] >= nums[0]) {\n            left = mid + 1;\n        } else if (nums[mid] < nums[0]) {\n            p = mid;\n            right = mid - 1;\n        }\n    }\n\n    left = p;\n    right = p + nums.length - 1;\n    while (left <= right) {\n        int mid = (left + right) \/ 2;\n        int index = mid % nums.length;\n        if (nums[index] > target) {\n            right = mid - 1;\n        } else if (nums[index] < target) {\n            left = mid + 1;\n        } else {\n            return index;\n        }\n    }\n\n    return -1;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
fun search(nums: IntArray, target: Int): Int {\n    var left = 0\n    var right = nums.size - 1\n    while (left <= right) {\n        val mid = (left + right) \/ 2\n        if (nums[mid] == target) {\n            return mid\n        }\n        if (mid + 1 <= right && nums[mid + 1] <= nums[right]) {\n            if (target in nums[mid + 1]..nums[right]) {\n                left = mid + 1\n            } else {\n                right = mid - 1\n            }\n        } else {\n            if (mid - 1 >= left && target in nums[left]..nums[mid - 1]) {\n                right = mid - 1\n            } else {\n                left = mid + 1\n            }\n        }\n    }\n    return -1\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u6574\u6570\u6570\u7ec4 nums \u6309\u5347\u5e8f\u6392\u5217\uff0c\u6570\u7ec4\u4e2d\u7684\u503c \u4e92\u4e0d\u76f8\u540c \u3002 \u5728\u4f20\u9012\u7ed9\u51fd\u6570\u4e4b\u524d\uff0cnums \u5728\u9884\u5148\u672a\u77e5\u7684\u67d0 […]<\/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":[20,32],"class_list":["post-990","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-32"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/990","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=990"}],"version-history":[{"count":2,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/990\/revisions"}],"predecessor-version":[{"id":993,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/990\/revisions\/993"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}