{"id":126,"date":"2005-12-10T16:48:06","date_gmt":"2005-12-10T08:48:06","guid":{"rendered":"http:\/\/tmp.xujiwei.com\/blog\/?p=126"},"modified":"2010-01-29T12:58:47","modified_gmt":"2010-01-29T04:58:47","slug":"c-greedy","status":"publish","type":"post","link":"https:\/\/xujiwei.com\/blog\/2005\/12\/c-greedy\/","title":{"rendered":"[C] \u8d2a\u5fc3\u7b97\u6cd5"},"content":{"rendered":"<p>\u53bb\u56fe\u4e66\u9986\u501f\u4e86\u672c\u7b97\u6cd5\u4e0e\u6570\u636e\u7ed3\u6784\uff0c\u7b2c\u4e00\u8282\u91cc\u6709\u4e2a\u8d2a\u5fc3\u7b97\u6cd5\uff0c\u56de\u5bdd\u5ba4\u4fbf\u8bd5\u4e86\u4e0b\uff0c\u4e0d\u60f3\u78b0\u5230\u4e86\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n<p>\u4f8b1.1\u00a0\u5feb\u901f\u9001\u8fbe\u75ab\u82d7<\/p>\n<p>\u5df2 \u77e5\u6709\u90bb\u8fd1\u7684\u4e94\u4e2a\u6751\u5b50\u53d1\u751f\u4e86\u75ab\u60c5\uff0c\u89c1\u56fe1-1\u3002\u6211\u4eec\u8981\u7528\u6c7d\u8f66\u5feb\u901f\u5730\u5c06\u75ab\u82d7\u9001\u8fbe\u52305\u4e2a\u6751\u5b50\uff0c\u76ee\u6807\u662f\u5bfb\u627e\u4e00\u6761\u8017\u65f6\u6700\u5c11\u7684\u8def\u7ebf\u3002<\/p>\n<p>\u753b\u56fe\u4e0d\u65b9\u4fbf\u5c31\u4e0d\u653e \u4e86\uff1a\uff09\u4ee3\u7801\u91ccs\u6570\u7ec4\u5b58\u653e\u7684\u5c31\u662f\u5404\u4e2a\u6751\u5b50\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002<\/p>\n<p>\u6211\u7528C\u5199\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<blockquote><p><span style=\"font-style: normal;\">#include &lt;stdio.h&gt;<\/span><\/p>\n<p><span style=\"font-style: normal;\">int s[5][5]={<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {0,1,2,7,5},<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {1,0,4,4,3},<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {2,4,0,1,2},<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {7,4,1,0,3},<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {5,3,2,3,0},<\/span><\/p>\n<p><span style=\"font-style: normal;\">};<\/span><\/p>\n<p><span style=\"font-style: normal;\">int visited[5]={0};<\/span><\/p>\n<p><span style=\"font-style: normal;\">int mindis(int start)<\/span><\/p>\n<p><span style=\"font-style: normal;\">{<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int i;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int d=10;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int n;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> for(i=0;i&lt;5;i++)<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {<\/span><\/p>\n<p><span style=\"font-style: normal;\"> if(visited[i]==0&amp;&amp;s[start][i]&lt;d)<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {<\/span><\/p>\n<p><span style=\"font-style: normal;\"> d=s[start][i];<\/span><\/p>\n<p><span style=\"font-style: normal;\"> n=i;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> }<\/span><\/p>\n<p><span style=\"font-style: normal;\"> }<\/span><\/p>\n<p><span style=\"font-style: normal;\"> visited[n]=1;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> return n;<\/span><\/p>\n<p><span style=\"font-style: normal;\">}<\/span><\/p>\n<p><span style=\"font-style: normal;\">void greedy(int start)<\/span><\/p>\n<p><span style=\"font-style: normal;\">{<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int cost;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int i;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int n;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> int ss;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> ss=start-1;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> printf(\"%d\",start);<\/span><\/p>\n<p><span style=\"font-style: normal;\"> visited[ss]=1;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> for(i=0;i&lt;4;i++)<\/span><\/p>\n<p><span style=\"font-style: normal;\"> {<\/span><\/p>\n<p><span style=\"font-style: normal;\"> n=mindis(ss);<\/span><\/p>\n<p><span style=\"font-style: normal;\"> cost+=s[ss][n];<\/span><\/p>\n<p><span style=\"font-style: normal;\"> printf(\"-%d\",n+1);<\/span><\/p>\n<p><span style=\"font-style: normal;\"> ss=n;<\/span><\/p>\n<p><span style=\"font-style: normal;\"> }<\/span><\/p>\n<p><span style=\"font-style: normal;\"> cost+=s[ss][start-1];<\/span><\/p>\n<p><span style=\"font-style: normal;\"> printf(\"-%d\\ncost is:%d\\n\",start,cost);<\/span><\/p>\n<p><span style=\"font-style: normal;\">}<\/span><\/p>\n<p><span style=\"font-style: normal;\">int main()<\/span><\/p>\n<p><span style=\"font-style: normal;\">{<\/span><\/p>\n<p><span style=\"font-style: normal;\"> greedy(1);<\/span><\/p>\n<p><span style=\"font-style: normal;\"> return 0;<\/span><\/p>\n<p><span style=\"font-style: normal;\">}<\/span><\/p><\/blockquote>\n<p>\u5728 \u5199\u65f6\uff0c\u8c03\u8bd5\u4e86\u597d\u51e0\u6b21\uff0c\u518d\u67e5\u4e86\u4e00\u4e0b\u4e66\u624d\u771f\u6b63\u641e\u5b9a\u3002<\/p>\n<p>1.\u00a0\u6570\u7ec4\u7684\u521d\u59cb\u5316\u3002<\/p>\n<p>\u5728\u521d\u59cb\u5316\u6751\u5b50\u8ddd\u79bb\u6570\u7ec4\u65f6\uff0c\u6211\u5148\u7528\u7684\u662f\u8fd9\u6837\u8bed\u53e5\uff1a<\/p>\n<p>int\u00a0s[5][5]={<\/p>\n<p>(0,1,2,7,5),<\/p>\n<p>(1,0,4,4,3),<\/p>\n<p>(2,4,0,1,2),<\/p>\n<p>(7,4,1,0,3),<\/p>\n<p>(5,3,2,3,0),<\/p>\n<p>};<\/p>\n<p>\u7ed3 \u679c\u5f04\u4e86\u534a\u5929\u5f97\u4e0d\u5230\u6b63\u786e\u7ed3\u679c\uff0c\u628a\u5c0f\u62ec\u53f7\u6539\u6210\u82b1\u62ec\u53f7\u540e\u624d\u89e3\u51b3\u4e86\u95ee\u9898\u3002\u6570\u7ec4\u521d\u59cb\u5316\u65f6\u7528\u82b1\u62ec\u53f7\u662f\u6309\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p>2.\u00a0\u6570\u7ec4\u4e0b\u6807\u8d77\u59cb\u503c<\/p>\n<p>\u6570 \u7ec4\u7684\u4e0b\u6807\u8d77\u59cb\u503c\u5e94\u4e3a0\uff0c\u5728\u5f00\u59cb\u65f6\u6211\u5374\u6ca1\u6709\u60f3\u5230\uff0c\u5728mail()\u91cc\u4f20\u8fc7\u6765\u76841\u5c31\u76f4\u63a5\u7528\u8fdb\u53bb\u4e86\uff0c\u7ed3\u679c\u662f\u8f93\u51fa\u91cc\u6709\u4e00\u4e2a\u8d85\u5927\u7684\u503c\u3002<\/p>\n<p>\u5f53\u7136\u4e86\uff0c\u6211\u5199\u7684\u8fd9 \u4e2a\u5e76\u4e0d\u597d\uff0c\u4ee5\u4e0a\u7684\u95ee\u9898\u4e5f\u53ea\u662f\u6211\u4e2a\u4eba\u7684\u89c1\u89e3\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u9519\u8bef\u8fd8\u671b\u6307\u70b9\u4e00\u4e8c\uff1a\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u53bb\u56fe\u4e66\u9986\u501f\u4e86\u672c\u7b97\u6cd5\u4e0e\u6570\u636e\u7ed3\u6784\uff0c\u7b2c\u4e00\u8282\u91cc\u6709\u4e2a\u8d2a\u5fc3\u7b97\u6cd5\uff0c\u56de\u5bdd\u5ba4\u4fbf\u8bd5\u4e86\u4e0b\uff0c\u4e0d\u60f3\u78b0\u5230\u4e86\u4e00 &hellip;<\/p>\n<p class=\"read-more\"><a href=\"https:\/\/xujiwei.com\/blog\/2005\/12\/c-greedy\/\">\u7ee7\u7eed\u9605\u8bfb &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[84],"tags":[41,85],"_links":{"self":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts\/126"}],"collection":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/comments?post=126"}],"version-history":[{"count":0,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts\/126\/revisions"}],"wp:attachment":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/media?parent=126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/categories?post=126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/tags?post=126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}