{"id":1940,"date":"2017-03-19T21:06:37","date_gmt":"2017-03-19T13:06:37","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=1940"},"modified":"2025-01-08T15:57:25","modified_gmt":"2025-01-08T07:57:25","slug":"%e7%bb%8f%e5%85%b8%e7%ae%97%e6%b3%95%e9%a2%98%e6%af%8f%e6%97%a5%e6%bc%94%e7%bb%83-%e7%ac%ac%e5%8d%81%e4%b8%80%e9%a2%98-bitmap%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/%e7%bb%8f%e5%85%b8%e7%ae%97%e6%b3%95%e9%a2%98%e6%af%8f%e6%97%a5%e6%bc%94%e7%bb%83-%e7%ac%ac%e5%8d%81%e4%b8%80%e9%a2%98-bitmap%e7%ae%97%e6%b3%95\/","title":{"rendered":"\u7ecf\u5178\u7b97\u6cd5\u9898\u6bcf\u65e5\u6f14\u7ec3\u2014\u2014\u7b2c\u5341\u4e00\u9898 Bitmap\u7b97\u6cd5"},"content":{"rendered":"\n

\u5728\u6240\u6709\u5177\u6709\u6027\u80fd\u4f18\u5316\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u6211\u60f3\u5927\u5bb6\u4f7f\u7528\u6700\u591a\u7684\u5c31\u662fhash\u8868\uff0c\u662f\u7684\uff0c\u5728\u5177\u6709\u5b9a\u4f4d\u67e5\u627e\u4e0a\u5177\u6709O(1)\u7684\u5e38\u91cf\u65f6\u95f4\uff0c\u591a\u4e48\u7684\u7b80\u6d01\u4f18\u7f8e\uff0c<\/p>\n\n\n\n

\u4f46\u662f\u5728\u7279\u5b9a\u7684\u573a\u5408\u4e0b\uff1a<\/p>\n\n\n\n

\u2460\uff1a\u5bf910\u4ebf\u4e2a\u4e0d\u91cd\u590d\u7684\u6574\u6570\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n\n\n\n

\u2461\uff1a\u627e\u51fa10\u4ebf\u4e2a\u6570\u5b57\u4e2d\u91cd\u590d\u7684\u6570\u5b57\u3002<\/p>\n\n\n\n

\u5f53\u7136\u6211\u53ea\u6709\u666e\u901a\u7684\u670d\u52a1\u5668\uff0c\u5c31\u7b972G\u7684\u5185\u5b58\u5427\uff0c\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u8be5\u5982\u4f55\u66f4\u597d\u7684\u6311\u9009\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5\u5462\uff1f<\/p>\n\n\n\n

\u4e00\uff1a\u95ee\u9898\u5206\u6790<\/p>\n\n\n\n

\u8fd9\u5e74\u5934\uff0c\u5927\u725b\u4eec\u5199\u7684\u6392\u5e8f\u7b97\u6cd5\u4e5f\u5c31\u90a3\u4e48\u51e0\u4e2a\uff0c\u9996\u5148\u6211\u4eec\u7b97\u4e0b\u653e\u5728\u5185\u5b58\u4e2d\u8981\u591a\u5c11G: (10\u4ebf * 32)\/(1024*1024*1024*8)=3.6G\uff0c\u53ef\u601c<\/p>\n\n\n\n

\u76842G\u5185\u5b58\u76f4\u63a5\u7206\u6389\uff0c\u6240\u4ee5\u5404\u79cd\u795e\u9a6c\u7684\u6570\u636e\u7ed3\u6784\u90fd\u73a9\u4e0d\u8d77\u6765\u4e86\uff0c\u5f53\u7136\u4f7f\u7528\u5916\u6392\u5e8f\u8fd8\u662f\u53ef\u4ee5\u89e3\u51b3\u95ee\u9898\u7684\uff0c\u7531\u4e8e\u8981\u8d70IO\u6240\u4ee5\u6682\u65f6\u5254\u9664\uff0c\u56e0\u4e3a\u6211\u4eec<\/p>\n\n\n\n

\u8981\u73a9\u9ad8\u6027\u80fd\uff0c\u65e0\u671b\u540e\u6211\u4eec\u60f3\u60f3\u53ef\u4e0d\u53ef\u4ee5\u5728\u4e8c\u8fdb\u5236\u4f4d\u4e0a\u505a\u4e9b\u624b\u811a\uff1f<\/p>\n\n\n\n

\u6bd4\u5982\u6211\u8981\u5bf9{1,5,7,2}\u8fd9\u56db\u4e2abyte\u7c7b\u578b\u7684\u6570\u5b57\u505a\u6392\u5e8f\uff0c\u8be5\u600e\u4e48\u505a\u5462\uff1f\u6211\u4eec\u77e5\u9053byte\u662f\u53608\u4e2abit\u4f4d\uff0c\u5176\u5b9e\u6211\u4eec\u53ef\u4ee5\u5c06\u6570\u7ec4\u4e2d\u7684\u503c\u4f5c\u4e3abit\u4f4d\u7684<\/p>\n\n\n\n

key\uff0cvalue\u7528\u201d0\uff0c1\u201c\u6765\u6807\u8bc6\u8be5key\u662f\u5426\u51fa\u73b0\u8fc7\uff1f\u4e0b\u9762\u770b\u56fe\uff1a<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u4ece\u56fe\u4e2d\u6211\u4eec\u7cbe\u5f69\u7684\u770b\u5230\uff0c\u6211\u4eec\u7684\u6570\u7ec4\u503c\u90fd\u5df2\u7ecf\u4f5c\u4e3abyte\u4e2d\u7684key\u4e86\uff0c\u6700\u540e\u6211\u53ea\u8981\u904d\u5386\u5bf9\u5e94\u7684bit\u4f4d\u662f\u5426\u4e3a1\u5c31\u53ef\u4ee5\u4e86\uff0c\u90a3\u4e48\u81ea\u7136\u5c31\u6210\u6709\u5e8f\u6570\u7ec4\u4e86\u3002<\/p>\n\n\n\n

\u53ef\u80fd\u6709\u4eba\u8bf4\uff0c\u6211\u589e\u52a0\u4e00\u4e2a13\u600e\u4e48\u529e\uff1f\u5f88\u7b80\u5355\uff0c\u4e00\u4e2a\u5b57\u8282\u53ef\u4ee5\u5b58\u653e8\u4e2a\u6570\uff0c\u90a3\u6211\u53ea\u8981\u4e24\u4e2abyte\u5c31\u53ef\u4ee5\u89e3\u51b3\u95ee\u9898\u4e86\u3002<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u53ef\u4ee5\u770b\u51fa\u6211\u5c06\u4e00\u4e2a\u7ebf\u6027\u7684\u6570\u7ec4\u53d8\u6210\u4e86\u4e00\u4e2abit\u4f4d\u7684\u4e8c\u7ef4\u77e9\u9635\uff0c\u6700\u7ec8\u6211\u4eec\u9700\u8981\u7684\u7a7a\u95f4\u4ec5\u4ec5\u662f:3.6G\/32=0.1G\u5373\u53ef\uff0c\u8981\u6ce8\u610f\u7684\u662fbitmap\u6392\u5e8f\u4e0d<\/p>\n\n\n\n

\u662fN\u7684\uff0c\u800c\u662f\u53d6\u51b3\u4e8e\u5f85\u6392\u5e8f\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e0a\u5173\u7cfb\u4e5f\u4e0d\u5927\uff0c\u6bd4\u5982\u6211\u5f0010\u4e2a\u7ebf\u7a0b\u53bb\u8bfbbyte\u6570\u7ec4\uff0c\u90a3\u4e48\u590d\u6742\u5ea6\u4e3a:O(Max\/10)\u3002<\/p>\n\n\n\n

\u4e8c\uff1a\u4ee3\u7801<\/p>\n\n\n\n

\u6211\u60f3bitmap\u7684\u601d\u60f3\u5927\u5bb6\u90fd\u6e05\u695a\u4e86\uff0c\u8fd9\u4e00\u6b21\u53c8\u8ba9\u6211\u4eec\u89c1\u8bc1\u4e86\u4e8c\u8fdb\u5236\u7684\u9b45\u529b\uff0c\u5f53\u7136\u8fd9\u4e9b\u79fb\u4f4d\u90fd\u662f\u4f4d\u8fd0\u7b97\u7684\u5de5\u4f5c\u4e86\uff0c\u719f\u6089\u4e86\u4f60\u5c31\u73a9\u8f6c\u4e86\u3002<\/p>\n\n\n\n

1:Clear\u65b9\u6cd5\uff08\u5c06\u6570\u7ec4\u7684\u6240\u6709bit\u4f4d\u7f6e0\uff09<\/p>\n\n\n\n

\u6bd4\u5982\u8981\u5c06\u5f53\u524d4\u5bf9\u5e94\u7684bit\u4f4d\u7f6e0\u7684\u8bdd\uff0c\u53ea\u9700\u89811\u5de6\u79fb4\u4f4d\u53d6\u53cd\u4e0eB[0] & \u5373\u53ef\u3002<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\n
 1         #region \u521d\u59cb\u5316\u6240\u7528\u7684bit\u4f4d\u4e3a0\n 2         \/\/\/ <summary>\n 3         \/\/\/ \u521d\u59cb\u5316\u6240\u7528\u7684bit\u4f4d\u4e3a0\n 4         \/\/\/ <\/summary>\n 5         \/\/\/ <param name=\"i\"><\/param>\n 6         static void Clear(byte i)\n 7         {\n 8             \/\/\u76f8\u5f53\u4e8e i%8 \u7684\u529f\u80fd\n 9             var shift = i & 0x07;\n10 \n11             \/\/\u8ba1\u7b97\u5e94\u8be5\u653e\u6570\u7ec4\u7684\u4e0b\u6807\n12             var arrindex = i >> 3;\n13 \n14             \/\/\u5219\u5c06\u5f53\u524dbyte\u4e2d\u7684\u6307\u5b9abit\u4f4d\u53d60\uff0c&\u540e\u5176\u4ed6\u5bf9\u65b9\u6570\u7ec4bit\u4f4d\u5fc5\u7136\u4e0d\u53d8\uff0c\u8fd9\u5c31\u662f 1 \u7684\u5999\u7528\n15             var bitPos = ~(1 << shift);\n16 \n17             \/\/\u5c06\u6570\u7ec4\u4e2d\u7684\u6307\u5b9abit\u4f4d\u7f6e\u4e00  \u201c& \u64cd\u4f5c\u201d\n18             a[arrindex] &= (byte)(bitPos);\n19         }\n20         #endregion<\/pre>\n<\/div>\n\n\n\n
2:Add\u65b9\u6cd5\uff08\u5c06bit\u7f6e1\u64cd\u4f5c\uff09<\/p>\n\n\n\n
\u540c\u6837\u4e5f\u5f88\u7b80\u5355\uff0c\u8981\u5c06\u5f53\u524d4\u5bf9\u5e94\u7684bit\u4f4d\u7f6e1\u7684\u8bdd\uff0c\u53ea\u9700\u89811\u5de6\u79fb4\u4f4d\u4e0eB[0] | \u5373\u53ef\u3002<\/p>\n\n\n\n
\n
 1 #region \u8bbe\u7f6e\u76f8\u5e94bit\u4f4d\u4e0a\u4e3a1\n 2         \/\/\/ <summary>\n 3         \/\/\/ \u8bbe\u7f6e\u76f8\u5e94bit\u4f4d\u4e0a\u4e3a1\n 4         \/\/\/ <\/summary>\n 5         \/\/\/ <param name=\"i\"><\/param>\n 6         static void Add(byte i)\n 7         {\n 8             \/\/\u76f8\u5f53\u4e8e i%8 \u7684\u529f\u80fd\n 9             var shift = i & 0x07;\n10 \n11             \/\/\u8ba1\u7b97\u5e94\u8be5\u653e\u6570\u7ec4\u7684\u4e0b\u6807\n12             var arrindex = i >> 3;\n13 \n14             \/\/\u5c06byte\u4e2d\u7684 1 \u79fb\u52a8\u5230i\u4f4d\n15             var bitPos = 1 << shift;\n16 \n17             \/\/\u5c06\u6570\u7ec4\u4e2d\u7684\u6307\u5b9abit\u4f4d\u7f6e\u4e00  \u201c| \u64cd\u4f5c\u201d\n18             a[arrindex] |= (byte)bitPos;\n19         }\n20         #endregion<\/pre>\n<\/div>\n\n\n\n
2:Contain\u65b9\u6cd5\uff08\u5224\u65ad\u5f53\u524dbit\u4f4d\u662f\u5426\u662f1\uff09<\/p>\n\n\n\n
\u5982\u679c\u770b\u61c2\u4e86Clear\u548cAdd\uff0c\u6211\u76f8\u4fe1\u6700\u540e\u4e00\u4e2a\u65b9\u6cd5\u5df2\u7ecf\u4e0d\u6210\u95ee\u9898\u4e86\u3002<\/p>\n\n\n\n
\n
 1         #region \u5224\u65ad\u5f53\u524d\u7684x\u5728\u6570\u7ec4\u7684\u4f4d\u4e2d\u662f\u5426\u5b58\u5728\n 2         \/\/\/ <summary>\n 3         \/\/\/\u5224\u65ad\u5f53\u524d\u7684x\u5728\u6570\u7ec4\u7684\u4f4d\u4e2d\u662f\u5426\u5b58\u5728\n 4         \/\/\/ <\/summary>\n 5         \/\/\/ <param name=\"i\"><\/param>\n 6         \/\/\/ <returns><\/returns>\n 7         static bool Contain(byte i)\n 8         {\n 9             var j = a[i >> 3] & (1 << (i & 0x07));\n10 \n11             if (j == 0)\n12                 return false;\n13             return true;\n14         }\n15         #endregion<\/pre>\n<\/div>\n\n\n\n
\u6700\u540e\u4e0a\u603b\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
<\/p>\n\n\n\n
\u6587\u7ae0\u6765\u81ea\u7f51\u7edc\u535a\u5ba2https:\/\/www.cnblogs.com\/huangxincheng\/archive\/2012\/12\/06\/2804756.html<\/p>\n","protected":false},"excerpt":{"rendered":"
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