{"id":2753,"date":"2022-04-16T17:00:30","date_gmt":"2022-04-16T09:00:30","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2753"},"modified":"2022-04-16T18:22:58","modified_gmt":"2022-04-16T10:22:58","slug":"%e7%ae%97%e6%b3%95%e5%9f%ba%e7%a1%80%e7%ac%ac%e5%85%ad%e5%a4%a9","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2753","title":{"rendered":"\u7b97\u6cd5\u57fa\u7840\u7b2c\u516d\u5929"},"content":{"rendered":"\n

200. \u5c9b\u5c7f\u6570\u91cf<\/a><\/p>\n\n\n\n

\u8fd9\u4e00\u9898\u662f\u7528bfs\u6765\u89e3\u6bd4\u8f83\u65b9\u4fbf\u7406\u89e3\u7684\uff0c\u548c\u4e4b\u524d\u7684\u70c2\u756a\u8304\u4e4b\u7c7b\u7684\u7c7b\u4f3c\u7684\u3002\u8bb0\u5f97\u8981\u5ba1\u9898\uff0c\u8fd9\u91cc\u6c42\u7684\u662f\u6709\u591a\u5c11\u4e2a\u8fde\u7247\u7684\u5c9b\u5c7f\u3002<\/p>\n\n\n\n


\/**
<\/em> 200. \u5c9b\u5c7f\u6570\u91cf
<\/em> \u7ed9\u4f60\u4e00\u4e2a\u7531 '1'\uff08\u9646\u5730\uff09\u548c '0'\uff08\u6c34\uff09\u7ec4\u6210\u7684\u7684\u4e8c\u7ef4\u7f51\u683c\uff0c\u8bf7\u4f60\u8ba1\u7b97\u7f51\u683c\u4e2d\u5c9b\u5c7f\u7684\u6570\u91cf\u3002
<\/em>
<\/em> \u5c9b\u5c7f\u603b\u662f\u88ab\u6c34\u5305\u56f4\uff0c\u5e76\u4e14\u6bcf\u5ea7\u5c9b\u5c7f\u53ea\u80fd\u7531\u6c34\u5e73\u65b9\u5411\u548c\/\u6216\u7ad6\u76f4\u65b9\u5411\u4e0a\u76f8\u90bb\u7684\u9646\u5730\u8fde\u63a5\u5f62\u6210\u3002
<\/em>
<\/em> \u6b64\u5916\uff0c\u4f60\u53ef\u4ee5\u5047\u8bbe\u8be5\u7f51\u683c\u7684\u56db\u6761\u8fb9\u5747\u88ab\u6c34\u5305\u56f4\u3002
<\/em>
<\/em>
<\/em>
<\/em> \u793a\u4f8b 1\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1agrid = [
<\/em> [\"1\",\"1\",\"1\",\"1\",\"0\"],
<\/em> [\"1\",\"1\",\"0\",\"1\",\"0\"],
<\/em> [\"1\",\"1\",\"0\",\"0\",\"0\"],
<\/em> [\"0\",\"0\",\"0\",\"0\",\"0\"]
<\/em> ]
<\/em> \u8f93\u51fa\uff1a1
<\/em> \u793a\u4f8b 2\uff1a
<\/em>
<\/em> \u8f93\u5165\uff1agrid = [
<\/em> [\"1\",\"1\",\"0\",\"0\",\"0\"],
<\/em> [\"1\",\"1\",\"0\",\"0\",\"0\"],
<\/em> [\"0\",\"0\",\"1\",\"0\",\"0\"],
<\/em> [\"0\",\"0\",\"0\",\"1\",\"1\"]
<\/em> ]
<\/em> \u8f93\u51fa\uff1a3
<\/em>
<\/em>
<\/em> \u63d0\u793a\uff1a
<\/em>
<\/em> m == grid.length
<\/em> n == grid[i].length
<\/em> 1 <= m, n <= 300
<\/em> grid[i][j] \u7684\u503c\u4e3a '0' \u6216 '1'
<\/em>
<\/em> * <\/em>@author <\/em><\/strong>zeroheart
<\/em> *
<\/em> *\/
<\/em>public class Question200 {

    public int numIslands(char[][] grid) {
        int m = grid.length;
        int n = grid[0].length;

        int res = 0;

        for(int i = 0; i<m; i++){
            for(int j = 0; j<n; j++){
                if(grid[i][j] == '1'){
                    bfs(grid, i, j);
                    res++;
                }
            }
        }

        return res;
    }

    private void bfs(char[][] grid, int x, int y){
        int m = grid.length;
        int n = grid[0].length;

        int[] dx = {-1, 1, 0, 0};
        int[] dy = {0, 0, -1, 1};

        if(x < 0 || y < 0 || x >= m || y >= n || grid[x][y] == '0') return;

        grid[x][y] = '0';
        for(int i = 0; i<4; i++){
            int nx = x + dx[i];
            int ny = y + dy[i];
            bfs(grid, nx, ny);
        }

    }

}<\/pre>\n\n\n\n
547. \u7701\u4efd\u6570\u91cf<\/a><\/p>\n\n\n\n
\u8fd9\u4e2a\u548c\u5c9b\u5c7f\u6570\u91cf\u6ca1\u6709\u533a\u522b\u7684\u611f\u89c9.......\u5b9e\u9645\u4e0a\u6709\u53bb\u533a\u522b\u7684\uff0c\u662f\u4e00\u7ec4\u76f4\u63a5\u6216\u95f4\u63a5\u76f8\u8fde\u7684\u57ce\u5e02\uff0c\u5c9b\u5c7f\u90fd\u662f\u76f4\u63a5\u76f8\u8fde\u7684.......<\/mark><\/pre>\n\n\n\n
\n\/**\n 547. \u7701\u4efd\u6570\u91cf\n \u6709 n \u4e2a\u57ce\u5e02\uff0c\u5176\u4e2d\u4e00\u4e9b\u5f7c\u6b64\u76f8\u8fde\uff0c\u53e6\u4e00\u4e9b\u6ca1\u6709\u76f8\u8fde\u3002\u5982\u679c\u57ce\u5e02 a \u4e0e\u57ce\u5e02 b \u76f4\u63a5\u76f8\u8fde\uff0c\u4e14\u57ce\u5e02 b \u4e0e\u57ce\u5e02 c \u76f4\u63a5\u76f8\u8fde\uff0c\u90a3\u4e48\u57ce\u5e02 a \u4e0e\u57ce\u5e02 c \u95f4\u63a5\u76f8\u8fde\u3002\n\n \u7701\u4efd \u662f\u4e00\u7ec4\u76f4\u63a5\u6216\u95f4\u63a5\u76f8\u8fde\u7684\u57ce\u5e02\uff0c\u7ec4\u5185\u4e0d\u542b\u5176\u4ed6\u6ca1\u6709\u76f8\u8fde\u7684\u57ce\u5e02\u3002\n\n \u7ed9\u4f60\u4e00\u4e2a n x n \u7684\u77e9\u9635 isConnected \uff0c\u5176\u4e2d isConnected[i][j] = 1 \u8868\u793a\u7b2c i \u4e2a\u57ce\u5e02\u548c\u7b2c j \u4e2a\u57ce\u5e02\u76f4\u63a5\u76f8\u8fde\uff0c\u800c isConnected[i][j] = 0 \u8868\u793a\u4e8c\u8005\u4e0d\u76f4\u63a5\u76f8\u8fde\u3002\n\n \u8fd4\u56de\u77e9\u9635\u4e2d \u7701\u4efd \u7684\u6570\u91cf\u3002\n\n\n\n \u793a\u4f8b 1\uff1a\n\n\n \u8f93\u5165\uff1aisConnected = [[1,1,0],[1,1,0],[0,0,1]]\n \u8f93\u51fa\uff1a2\n \u793a\u4f8b 2\uff1a\n\n\n \u8f93\u5165\uff1aisConnected = [[1,0,0],[0,1,0],[0,0,1]]\n \u8f93\u51fa\uff1a3\n\n\n \u63d0\u793a\uff1a\n\n 1 <= n <= 200\n n == isConnected.length\n n == isConnected[i].length\n isConnected[i][j] \u4e3a 1 \u6216 0\n isConnected[i][i] == 1\n isConnected[i][j] == isConnected[j][i]\n\n * @author zeroheart\n *\n *\/\npublic class Question547 {\n    public int findCircleNum(int[][] isConnected) {\n        \/\/ \u8fd9\u4e2a\u548c\u5c9b\u5c7f\u6570\u91cf\u6ca1\u6709\u533a\u522b\u7684\u611f\u89c9.......\u5b9e\u9645\u4e0a\u6709\u53bb\u533a\u522b\u7684\uff0c\u662f\u4e00\u7ec4\u76f4\u63a5\u6216\u95f4\u63a5\u76f8\u8fde\u7684\u57ce\u5e02\uff0c\u5c9b\u5c7f\u90fd\u662f\u76f4\u63a5\u76f8\u8fde\u7684.......\n        int n = isConnected.length;\n\n        boolean[] visited = new boolean[n];\n        Queue<Integer> queue = new LinkedList();\n        int res = 0;\n        for(int i = 0; i<n; i++){\n            if(!visited[i]){\n                res++;\n                queue.add(i);\n\n                while (!queue.isEmpty()){\n                    Integer poll = queue.poll();\n                    for(int x = 0; x<n; x++){\n                        if(isConnected[poll][x] == 1 && !visited[x]){\n                            visited[x] = true;\n                            queue.add(x);\n                        }\n                    }\n                }\n            }\n        }\n\n        return res;\n\n    }\n\n\n}<\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
200. \u5c9b\u5c7f\u6570\u91cf \u8fd9\u4e00\u9898\u662f\u7528bfs\u6765\u89e3\u6bd4\u8f83\u65b9\u4fbf\u7406\u89e3\u7684\uff0c\u548c\u4e4b\u524d\u7684\u70c2\u756a\u8304\u4e4b\u7c7b\u7684\u7c7b\u4f3c\u7684\u3002\u8bb0\u5f97\u8981\u5ba1\u9898\uff0c\u8fd9\u91cc\u6c42\u7684\u662f\u6709\u591a […]<\/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":[197],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2753"}],"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=2753"}],"version-history":[{"count":11,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2753\/revisions"}],"predecessor-version":[{"id":2767,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2753\/revisions\/2767"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}