{"id":19717,"date":"2022-11-07T13:27:17","date_gmt":"2022-11-07T07:57:17","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-um-hi-im-a-beginner-and-dont-know-how-to-speed-my-code-up-my-homework-is-to-write-a-program-for-ccc-20-s2-escape-room-faster-than-two-seconds\/"},"modified":"2022-11-07T13:27:17","modified_gmt":"2022-11-07T07:57:17","slug":"solved-um-hi-im-a-beginner-and-dont-know-how-to-speed-my-code-up-my-homework-is-to-write-a-program-for-ccc-20-s2-escape-room-faster-than-two-seconds","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-um-hi-im-a-beginner-and-dont-know-how-to-speed-my-code-up-my-homework-is-to-write-a-program-for-ccc-20-s2-escape-room-faster-than-two-seconds\/","title":{"rendered":"[Solved] Um, Hi I’m a Beginner and don’t know how to speed my code up. My homework is to write a program for CCC ’20 S2 – Escape Room faster than two seconds"},"content":{"rendered":"

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Take a look at this. I have tried grids 10×10 – solved in cca 3-4ms<\/strong> (including input), which is far below 2s.<\/p>\n

class Escape_Room {\n\n    static boolean method(Map<Integer, Set<Integer>> transitionMap, int size, int start) {\n        Set<Integer> closed = new HashSet<Integer>(size);\n        Queue<Integer> q = new LinkedList<>();\n        q.add(start);\n        int key;\n        while(!q.isEmpty()) {\n            key = q.poll();\n            if(closed.contains(key)) {\n                continue;\n            }\n            if(key == size) {\n                return true;\n            }\n            closed.add(key);\n            if(transitionMap.containsKey(key)) {\n                for (int i : transitionMap.get(key)) {\n                    if(i == size) {\n                        return true;\n                    }\n                    if (!closed.contains(i)) {\n                        q.add(i);\n                    }\n                }\n            }\n        }\n        return false;\n    }\n\n}\n\npublic class Solution {\n    static StringBuilder str;\n    static InputStreamReader in;\n    static int buf;\n\n    private static int readInt() throws IOException {\n        buf = 0;\n        int c;\n        do {\n            c = in.read(); \n        } while (c < '0' || c > '9' );\n        do {\n            buf = 10*buf + c - 48;\n            c = in.read();\n        } while (!(c < '0' || c > '9' ));\n        return buf;\n    }\n\n    public static void main(String[] args) throws IOException {\n        long t1 = System.currentTimeMillis();\n        Thread.currentThread().setPriority(Thread.MAX_PRIORITY);\n        in = new InputStreamReader(new BufferedInputStream(System.in));\n        int m=readInt();\n        int n=readInt();\n        int size = m*n;\n        Map<Integer, Set<Integer>> transitionMap = new HashMap<>(size);\n        Set<Integer> temp;\n        int start = 0, key = 0;\n\n        for (int i = 0, j, value; i < m; i++) {\n            for(j = 0; j < n; ++j) {\n                key = (i+1)*(j+1);\n                value = readInt();\n                if(i == 0 && j == 0) {\n                    start = key;\n                }\n                if (transitionMap.containsKey(key)) {\n                    transitionMap.get(key).add(value);\n                } else {\n                    temp = new HashSet<>(size);\n                    temp.add(value);\n                    transitionMap.put(key, temp);\n                }\n            }\n        }\n        long t2 = System.currentTimeMillis();       \n        boolean o = Escape_Room.method(transitionMap, size, start);\n        long t3 = System.currentTimeMillis();\n        System.out.println(o?\"yes\":\"no\");\n        System.out.println(\"Finished in: \" + (t3 - t1) + \"ms. Input: \" + (t2 - t1)  + \"ms. Solving: \" + (t3 - t2) + \" ms.\");\n    }\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Um, Hi I’m a Beginner and don’t know how to speed my code up. My homework is to write a program for CCC ’20 S2 – Escape Room faster than two seconds <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Take a look at this. I have tried grids 10×10 – solved in cca 3-4ms (including input), which is far below 2s. class Escape_Room { static boolean method(Map<Integer, Set<Integer>> transitionMap, int size, int start) { Set<Integer> closed = new HashSet<Integer>(size); Queue<Integer> q = new LinkedList<>(); q.add(start); int key; while(!q.isEmpty()) { key = q.poll(); if(closed.contains(key)) … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323],"class_list":["post-19717","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java"],"yoast_head":"\n[Solved] Um, Hi I'm a Beginner and don't know how to speed my code up. 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I have tried grids 10×10 – solved in cca 3-4ms (including input), which is far below 2s. class Escape_Room { static boolean method(Map<Integer, Set<Integer>> transitionMap, int size, int start) { Set<Integer> closed = new HashSet<Integer>(size); Queue<Integer> q = new LinkedList<>(); q.add(start); int key; while(!q.isEmpty()) { key = q.poll(); if(closed.contains(key)) ... 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