{"id":3081,"date":"2022-04-26T17:27:41","date_gmt":"2022-04-26T09:27:41","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3081"},"modified":"2022-04-26T23:10:24","modified_gmt":"2022-04-26T15:10:24","slug":"%e7%ae%97%e6%b3%95%e5%9f%ba%e7%a1%80%e7%ac%ac11%e5%a4%a9","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3081","title":{"rendered":"\u7b97\u6cd5\u57fa\u7840\u7b2c11\u5929"},"content":{"rendered":"\n

17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408<\/a><\/p>\n\n\n\n


\/**
<\/em> 17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408
<\/em> \u7ed9\u5b9a\u4e00\u4e2a\u4ec5\u5305\u542b\u6570\u5b57 2-9 \u7684\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u6240\u6709\u5b83\u80fd\u8868\u793a\u7684\u5b57\u6bcd\u7ec4\u5408\u3002\u7b54\u6848\u53ef\u4ee5\u6309 \u4efb\u610f\u987a\u5e8f \u8fd4\u56de\u3002
<\/em>
<\/em> \u7ed9\u51fa\u6570\u5b57\u5230\u5b57\u6bcd\u7684\u6620\u5c04\u5982\u4e0b\uff08\u4e0e\u7535\u8bdd\u6309\u952e\u76f8\u540c\uff09\u3002\u6ce8\u610f 1 \u4e0d\u5bf9\u5e94\u4efb\u4f55\u5b57\u6bcd\u3002
<\/em>
<\/em> \u793a\u4f8b 1\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1adigits = \"23\"
<\/em> \u8f93\u51fa\uff1a[\"ad\",\"ae\",\"af\",\"bd\",\"be\",\"bf\",\"cd\",\"ce\",\"cf\"]
<\/em> \u793a\u4f8b 2\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1adigits = \"\"
<\/em> \u8f93\u51fa\uff1a[]
<\/em> \u793a\u4f8b 3\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1adigits = \"2\"
<\/em> \u8f93\u51fa\uff1a[\"a\",\"b\",\"c\"]
<\/em>
<\/em>
<\/em> \u63d0\u793a\uff1a
<\/em>
<\/em> 0 <= digits.length <= 4
<\/em> digits[i] \u662f\u8303\u56f4 ['2', '9'] \u7684\u4e00\u4e2a\u6570\u5b57\u3002
<\/em>
<\/em> * <\/em>@author <\/em><\/strong>zeroheart
<\/em> *
<\/em> *\/
<\/em>public class Question17 {
    private List<String> res = new ArrayList<>();
    private StringBuilder path  = new StringBuilder();
    private String[] chars = {\"\",\"\",\"abc\",\"def\",\"ghi\",\"jkl\",\"mno\",\"pqrs\",\"tuv\",\"wxyz\"};

    public List<String> letterCombinations(String digits) {
        backtracting(digits, chars, 0);
        return res;
    }

    private void backtracting(String digits, String[] chars,  int x) {
        if(path.length() == digits.length()){
            String s = path.toString();
            res.add(s);
            System.out<\/em>.println(s);
            return;
        }

        String aChar = chars[digits.charAt(x)-'0'];
        int length = aChar.length();
        for(int j = 0; j<length; j++){
            path.append(aChar.charAt(j));
            backtracting(digits, chars, x+1);
            path.deleteCharAt(path.length() - 1);
        }
    }

    public static void main(String[] args) {
        new Question17().letterCombinations(\"23\");
    }
}<\/pre>\n\n\n\n
22. \u62ec\u53f7\u751f\u6210<\/a><\/p>\n\n\n\n

\/**
<\/em> 22. \u62ec\u53f7\u751f\u6210
<\/em> \u6570\u5b57 n \u4ee3\u8868\u751f\u6210\u62ec\u53f7\u7684\u5bf9\u6570\uff0c\u8bf7\u4f60\u8bbe\u8ba1\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u80fd\u591f\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u5e76\u4e14 \u6709\u6548\u7684 \u62ec\u53f7\u7ec4\u5408\u3002
<\/em>
<\/em>
<\/em>
<\/em> \u793a\u4f8b 1\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1an = 3
<\/em> \u8f93\u51fa\uff1a[\"((()))\",\"(()())\",\"(())()\",\"()(())\",\"()()()\"]
<\/em> \u793a\u4f8b 2\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1an = 1
<\/em> \u8f93\u51fa\uff1a[\"()\"]
<\/em>
<\/em>
<\/em> \u63d0\u793a\uff1a
<\/em>
<\/em> 1 <= n <= 8
<\/em>
<\/em> * <\/em>@author <\/em><\/strong>zeroheart
<\/em> *
<\/em> *\/
<\/em>public class Question22 {
    private List<String> res = new ArrayList<>();
    private StringBuilder path  = new StringBuilder();

    public List<String> generateParenthesis(int n) {
        backtracting(n, n);
        return res;
    }

    private void backtracting(int left, int right) {
        if(left == 0 && right == 0){
            String s = path.toString();
            res.add(s);
            System.out<\/em>.println(s);
            return;
        }

        \/\/ \u526a\u679d\uff08\u5982\u56fe\uff0c\u5de6\u62ec\u53f7\u53ef\u4ee5\u4f7f\u7528\u7684\u4e2a\u6570\u4e25\u683c\u5927\u4e8e\u53f3\u62ec\u53f7\u53ef\u4ee5\u4f7f\u7528\u7684\u4e2a\u6570\uff0c\u624d\u526a\u679d\uff0c\u6ce8\u610f\u8fd9\u4e2a\u7ec6\u8282\uff09
        if (left > right) {
            return;
        }

        if(left>0){
            path.append(\"(\");
            backtracting(left-1, right);
            path.deleteCharAt(path.length() - 1);
        }

        if(right>0){
            path.append(\")\");
            backtracting(left, right-1);
            path.deleteCharAt(path.length() - 1);
        }
    }

    public static void main(String[] args) {
        new Question22().generateParenthesis(3);
    }
}<\/pre>\n\n\n\n
79. \u5355\u8bcd\u641c\u7d22<\/a><\/p>\n\n\n\n

\/**
<\/em> 79. \u5355\u8bcd\u641c\u7d22
<\/em> \u7ed9\u5b9a\u4e00\u4e2a m x n \u4e8c\u7ef4\u5b57\u7b26\u7f51\u683c board \u548c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5355\u8bcd word \u3002\u5982\u679c word \u5b58\u5728\u4e8e\u7f51\u683c\u4e2d\uff0c\u8fd4\u56de true \uff1b\u5426\u5219\uff0c\u8fd4\u56de false \u3002
<\/em>
<\/em> \u5355\u8bcd\u5fc5\u987b\u6309\u7167\u5b57\u6bcd\u987a\u5e8f\uff0c\u901a\u8fc7\u76f8\u90bb\u7684\u5355\u5143\u683c\u5185\u7684\u5b57\u6bcd\u6784\u6210\uff0c\u5176\u4e2d\u201c\u76f8\u90bb\u201d\u5355\u5143\u683c\u662f\u90a3\u4e9b\u6c34\u5e73\u76f8\u90bb\u6216\u5782\u76f4\u76f8\u90bb\u7684\u5355\u5143\u683c\u3002\u540c\u4e00\u4e2a\u5355\u5143\u683c\u5185\u7684\u5b57\u6bcd\u4e0d\u5141\u8bb8\u88ab\u91cd\u590d\u4f7f\u7528\u3002
<\/em>
<\/em> \u793a\u4f8b 1\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1aboard = [[\"A\",\"B\",\"C\",\"E\"],[\"S\",\"F\",\"C\",\"S\"],[\"A\",\"D\",\"E\",\"E\"]], word = \"ABCCED\"
<\/em> \u8f93\u51fa\uff1atrue
<\/em> \u793a\u4f8b 2\uff1a
<\/em>
<\/em>
<\/em> \u8f93\u5165\uff1aboard = [[\"A\",\"B\",\"C\",\"E\"],[\"S\",\"F\",\"C\",\"S\"],[\"A\",\"D\",\"E\",\"E\"]], word = \"SEE\"
<\/em> \u8f93\u51fa\uff1atrue
<\/em> \u793a\u4f8b 3\uff1a
<\/em>
<\/em>
<\/em> \u8f93\u5165\uff1aboard = [[\"A\",\"B\",\"C\",\"E\"],[\"S\",\"F\",\"C\",\"S\"],[\"A\",\"D\",\"E\",\"E\"]], word = \"ABCB\"
<\/em> \u8f93\u51fa\uff1afalse
<\/em>
<\/em>
<\/em> \u63d0\u793a\uff1a
<\/em>
<\/em> m == board.length
<\/em> n = board[i].length
<\/em> 1 <= m, n <= 6
<\/em> 1 <= word.length <= 15
<\/em> board \u548c word \u4ec5\u7531\u5927\u5c0f\u5199\u82f1\u6587\u5b57\u6bcd\u7ec4\u6210
<\/em>
<\/em>
<\/em> * <\/em>@author <\/em><\/strong>zeroheart
<\/em> *
<\/em> *\/
<\/em>public class Question79 {
    private int pos = 0;
    private boolean res = false;
    private boolean[][] visited;
    public boolean exist(char[][] board, String word) {

        int m = board.length;
        int n = board[0].length;

        visited = new boolean[m][n];
        for(int i = 0; i<m; i++){
            for(int j = 0; j<n; j++){
                backtracting(i, j, pos, m, n, board, word);
            }
        }

        return res;
    }


    private void backtracting(int i, int j, int pos, int m, int n, char[][] board, String word) {
        if(i<0 || i>=m || j<0 || j>=n || visited[i][j]
                || word.charAt(pos)!=board[i][j]) { \/\/ \u8fd9\u4e2a\u5f00\u59cb\u5fd8\u8bb0\u5199\u4e86\u3002\u3002\u3002\u3002
            return;
        }

        if(pos == word.length()-1){
            res = true;
            return;
        }

        int[] dx = {-1, 1, 0, 0};
        int[] dy = {0, 0, 1, -1};
        visited[i][j] = true;
        for(int x = 0; x < 4; x++){
            backtracting(i+dx[x], j+dy[x], pos+1, m, n, board, word);
        }
        visited[i][j] = false;
    }
}<\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408 \/** 17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408 \u7ed9\u5b9a\u4e00\u4e2a\u4ec5\u5305\u542b\u6570\u5b57 2-9 \u7684\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u6240\u6709 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[155],"tags":[176],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3081"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3081"}],"version-history":[{"count":7,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3081\/revisions"}],"predecessor-version":[{"id":3088,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3081\/revisions\/3088"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}