{"id":16573553,"url":"https://github.com/v2e4lisp/sample","last_synced_at":"2026-04-24T05:33:11.070Z","repository":{"id":146654351,"uuid":"43216491","full_name":"v2e4lisp/sample","owner":"v2e4lisp","description":"sample 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NFC / NFD\r\n------------------\r\n\r\n```go\r\npackage main\r\n\r\nimport (\r\n\t\"fmt\"\r\n\r\n\t\"golang.org/x/text/unicode/norm\"\r\n)\r\n\r\n// \u003e go run /tmp/unicode.go\r\n// single accent NFC: é\r\n// \"\\u00e9\"\r\n//\r\n// single accent NFD: é\r\n// \"e\\u0301\"\r\n//\r\n// mutli accent NFD: é́\r\n// \"e\\u0301\\u0301\"\r\n//\r\n// mutli accent NFC: é́\r\n// \"\\u00e9\\u0301\"\r\nfunc main() {\r\n\tfmt.Print(\"single accent NFC: \")\r\n\te := \"\\u00e9\"\r\n\tfmt.Printf(\"%s\\n\", e)\r\n\tfmt.Printf(\"%+q\\n\", e)\r\n\r\n\tfmt.Print(\"\\nsingle accent NFD: \")\r\n\te2 := norm.NFD.String(e)\r\n\tfmt.Printf(\"%s\\n\", e2)\r\n\tfmt.Printf(\"%+q\\n\", e2)\r\n\r\n\tfmt.Print(\"\\nmutli accent NFD: \")\r\n\te3 := norm.NFD.String(\"e\\u0301\\u0301\")\r\n\tfmt.Printf(\"%s\\n\", e3)\r\n\tfmt.Printf(\"%+q\\n\", e3)\r\n\r\n\tfmt.Print(\"\\nmutli accent NFC: \")\r\n\te4 := norm.NFC.String(e3)\r\n\tfmt.Printf(\"%s\\n\", e4)\r\n\tfmt.Printf(\"%+q\\n\", e4)\r\n}\r\n```\r\n\r\ntcp server local addr\r\n---------------------\r\n\r\n```go\r\npackage main\r\n\r\nimport (\r\n\t\"log\"\r\n\t\"net\"\r\n)\r\n\r\n// Client\r\n//\r\n// ➜  ss nc 127.0.0.1 10080\r\n// ➜  ss nc 127.0.0.1 10080\r\n// ➜  ss nc 127.0.0.1 10080\r\n// ➜  ss nc 127.0.0.1 10080\r\n// ➜  ss nc 127.0.0.1 10080\r\n\r\n// Server\r\n//\r\n// ➜  ss go run /tmp/port.go\r\n// 2018/01/16 23:15:39 127.0.0.1:10080 -\u003e 127.0.0.1:59513\r\n// 2018/01/16 23:15:40 127.0.0.1:10080 -\u003e 127.0.0.1:59514\r\n// 2018/01/16 23:15:41 127.0.0.1:10080 -\u003e 127.0.0.1:59515\r\n// 2018/01/16 23:15:42 127.0.0.1:10080 -\u003e 127.0.0.1:59517\r\n// 2018/01/16 23:15:42 127.0.0.1:10080 -\u003e 127.0.0.1:59518\r\n\r\nfunc main() {\r\n\tln, err := net.Listen(\"tcp\", \":10080\")\r\n\tif err != nil {\r\n\t\tlog.Fatal(err)\r\n\t}\r\n\tfor {\r\n\t\tconn, err := ln.Accept()\r\n\t\tif err != nil {\r\n\t\t\tlog.Fatal(err)\r\n\t\t}\r\n\t\tgo func(conn net.Conn) {\r\n\t\t\tlog.Println(conn.LocalAddr(), \"-\u003e\", conn.RemoteAddr())\r\n\t\t\tconn.Close()\r\n\t\t}(conn)\r\n\t}\r\n}\r\n\r\n```\r\n\r\ntcpdump\r\n--------\r\n\r\n```sh\r\nsudo tcpdump -A -s0 -ilo0 src port 9000\r\nsudo tcpdump -A -s0 -ilo0 dst port 9000\r\n```\r\n\r\nnc\r\n--------\r\n\r\n```sh\r\nnc -vz IP_Address Port\r\n```\r\n\r\nbinary search\r\n---------------\r\n\r\n```java\r\nclass BSearch {\r\n    public static void main(String[] args) {\r\n        BSearch s = new BSearch();\r\n        int l0 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 5);\r\n        int l1 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 6);\r\n        int l2 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 12);\r\n        int l3 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 13);\r\n        int l4 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 0);\r\n        int l5 = s.lsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 1);\r\n\r\n        int r0 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 5);\r\n        int r1 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 6);\r\n        int r2 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 12);\r\n        int r3 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 13);\r\n        int r4 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 0);\r\n        int r5 = s.rsearch(new int[]{1,2,3,4,5,5,5,5,9,12}, 1);\r\n\r\n        System.out.println(\"\" + l0 + \",\" + r0);\r\n        System.out.println(\"\" + l1 + \",\" + r1);\r\n        System.out.println(\"\" + l2 + \",\" + r2);\r\n        System.out.println(\"\" + l3 + \",\" + r3);\r\n        System.out.println(\"\" + l4 + \",\" + r4);\r\n        System.out.println(\"\" + l5 + \",\" + r5);\r\n\r\n        // ➜  tmp java BSearch\r\n        // 4,7\r\n        // 7,8\r\n        // 9,9\r\n        // 9,10\r\n        // -1,0\r\n        // 0,0\r\n    }\r\n\r\n    // Return the index of the first target in nums if there is one\r\n    // or the index of the last element \u003c target\r\n    //\r\n    // suppose that nums[-1] = MIN_VALUE and nums[length] == MAX_VALUE;\r\n    // The function guarantees that nums[ret] \u003c= target \u0026\u0026 nums[ret+1] \u003e target\r\n    public int lsearch(int[] nums, int target) {\r\n        if (nums[0] \u003e target) return -1;\r\n        if (nums[nums.length-1] \u003c target) return nums.length - 1;\r\n\r\n        int l = 0;\r\n        int r = nums.length-1;\r\n\r\n        // invariant: nums[r] \u003e= target \u0026\u0026 nums[0..l-1] \u003c target\r\n        while (l \u003c r) {\r\n            int m = (l+r)/2;\r\n            if (nums[m] \u003c target) l = m+1;\r\n            else r = m;\r\n        }\r\n\r\n        // now we have:\r\n        // (1) l == r\r\n        // (2) nums[r] \u003e= target \u0026\u0026 nums[0..l-1] \u003c target;\r\n        //\r\n        // =\u003e nums[r] \u003e= target \u0026\u0026 nums[0, r-1] \u003c target\r\n        if (nums[r] == target) return r;\r\n        return r-1;\r\n    }\r\n\r\n    // the counterpart of lsearch\r\n    public int rsearch(int[] nums, int target) {\r\n        if (nums[0] \u003e target) return 0;\r\n        if (nums[nums.length-1] \u003c target) return nums.length;\r\n        if (nums[nums.length-1] == target) return nums.length - 1;\r\n\r\n        int l = 0;\r\n        int r = nums.length-1;\r\n\r\n        // invariant: nums[r] \u003e target \u0026\u0026 nums[0..l-1] \u003c= target\r\n        while (l \u003c r) {\r\n            int m = (l+r)/2;\r\n            if (nums[m] \u003c= target) l = m+1;\r\n            else r = m;\r\n        }\r\n\r\n        if (l \u003e 0 \u0026\u0026 nums[l-1] == target) return l-1;\r\n        return l;\r\n    }\r\n}\r\n```\r\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fv2e4lisp%2Fsample","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fv2e4lisp%2Fsample","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fv2e4lisp%2Fsample/lists"}