{"id":134660,"date":"2020-07-08T05:37:43","date_gmt":"2020-07-07T21:37:43","guid":{"rendered":"http:\/\/4563.org\/?p=134660"},"modified":"2020-07-08T05:37:43","modified_gmt":"2020-07-07T21:37:43","slug":"%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e7%ae%97%e6%b3%95%e6%b1%82%e5%8a%a9-%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e8%bf%99%e6%a0%b7%e4%b8%80%e4%b8%aa%e6%95%b0%e6%8d%ae%e5%ae%b9%e5%99%a8%ef%bc%8c","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=134660","title":{"rendered":"[\u6570\u636e\u7ed3\u6784\u7b97\u6cd5\u6c42\u52a9] \u5982\u4f55\u5b9e\u73b0\u8fd9\u6837\u4e00\u4e2a\u6570\u636e\u5bb9\u5668\uff0c\u7f13\u5b58 key-value \u6570\u636e\uff1f(javascript)"},"content":{"rendered":"
\n
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[\u6570\u636e\u7ed3\u6784\u7b97\u6cd5\u6c42\u52a9] \u5982\u4f55\u5b9e\u73b0\u8fd9\u6837\u4e00\u4e2a\u6570\u636e\u5bb9\u5668\uff0c\u7f13\u5b58 key-value \u6570\u636e\uff1f(javascript) <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : rikka <\/span> <\/i> 15<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u80cc\u666f\u9700\u6c42\u662f\uff0c\u9700\u8981\u4e00\u4e2a\u7b80\u5355\u7684\u6570\u636e\u5bb9\u5668\u5bf9\u4e00\u5806 key-value \u8fdb\u884c\u7f13\u5b58\uff08\u4ec0\u4e48 redis,memcache \u901a\u901a\u90fd\u4e0d\u8981\uff0c\u6211\u5c31\u60f3\u7b80\u5355\u7684\u5728\u5185\u5b58\u5b58\u70b9\u6570\u636e\u800c\u5df2\uff09<\/p>\n

\u5bb9\u5668\u6709\u4e24\u4e2a\u8981\u6c42<\/p>\n

1.\u56fa\u5b9a\u5bb9\u91cf\uff0c\u6ee1\u4e86\u4e4b\u540e\u63d2\u5165\u65b0\u6570\u636e\u5c31\u8981\u5220\u9664\u65e7\u6570\u636e\uff0c\u5220\u9664\u7b97\u6cd5\u7684\u6307\u5bfc\u601d\u60f3\u662f\uff0c\u5220\u9664\u90a3\u4e9b\u8d8a\u65e7\u8bfb\u53d6\u6b21\u6570\u8d8a\u5c11\u7684\u6570\u636e<\/p>\n

2.\u6570\u636e\u6709\u6548\u65f6\u95f4\uff0c\u6bd4\u5982\u8bbe\u7f6e 10 \u5206\u949f\uff0c10 \u5206\u949f\u540e\u8bfb\u53d6\u91cc\u9762\u67d0\u6761\u6570\u636e\u5c31\u5e94\u8be5\u5220\u6389\u8fd9\u6761\u6570\u636e\u5e76\u8fd4\u56de undefined<\/p>\n

\u611f\u89c9\u5f88\u7b80\u5355\u554a\uff0c\u6211\u7528\u4e2a Map \u6765\u5b9e\u73b0\u5c31\u53ef\u4ee5\u4e86<\/p>\n

data = new Map() data.set(key,{   value:'',\/\/\u5b58\u653e\u7684\u5177\u4f53\u6570\u636e   timestamp:0,\/\/\u65f6\u95f4\u6233\uff0c\u5224\u65ad\u662f\u5426\u8fc7\u671f\u7528   count:0\/\/\u6570\u636e\u88ab\u8bfb\u53d6\u7684\u6b21\u6570 }) <\/code><\/pre>\n
\u4f46\u662f\u95ee\u9898\u6765\u4e86\uff0c\u8981\u63d2\u5165\u65b0\u6570\u636e\u5bb9\u5668\u5df2\u7ecf\u6ee1\u4e86\uff0c\u600e\u4e48\u5220\u9664\uff1f<\/p>\n
\u6211\u4e0d\u5f97\u6839\u636e timestamp \u548c count \u8fd9 2 \u4e2a\u5b57\u6bb5\u5bf9\u5168\u90e8\u6570\u636e\u8fdb\u884c\u6392\u5e8f\uff1f<\/p>\n
\u6392\u5e8f\u5c31\u5f97\u904d\u5386\u554a\uff0c\u6781\u7aef\u60c5\u51b5\u8981\u662f 10 \u4e07\u6761\u6570\u636e\uff0c\u6bcf\u6b21\u5220\u9664\u90fd\u5f97\u904d\u5386\u4e00\u4e0b\uff0c\u8fd9\u54ea\u53d7\u5f97\u4e86<\/p>\n
\u5361\u5728\u8fd9\u4e86\uff0cMap \u4f3c\u4e4e\u4e0d\u884c\uff1f\u5e94\u8be5\u9009\u62e9\u4ec0\u4e48\u6837\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e2a\u5bb9\u5668\u6700\u5408\u9002\uff1f<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (38<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : aijam <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7c7b\u4f3c\uff1a https:\/\/leetcode.com\/problems\/lru-cache\/                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : luckyrayyy <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7b2c\u4e00\u4e2a\u8981\u6c42\u4e0d\u5c31\u662f lfu \u4e48\uff0c\u7136\u540e\u7528\u61d2\u5220\u9664\u7b56\u7565\uff0c\u6bcf\u6b21\u64cd\u4f5c\u7684\u65f6\u5019\u5224\u65ad\u521b\u5efa\u7684\u65f6\u95f4\u6233\u662f\u4e0d\u662f\u8d85\u8fc7\u4e86\u5341\u5206\u949f\uff0c\u8d85\u8fc7\u7684\u8bdd\u5c31\u5220\u9664\u5e76\u4e14\u8fd4\u56de undefined \u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : DonaldY <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 LRU \u3002<\/p>\n
    \u5220\u9664\u7684\u8bdd\uff1a
    1. \u5b9a\u65f6\u904d\u5386\u5220\u9664
    2. \u83b7\u53d6\u6570\u636e\u65f6\uff0c\u5224\u65ad\u65f6\u95f4\u662f\u5426\u8fc7\u671f\uff0c\u8fc7\u671f\u5219\u5220\u9664\u3002<\/p>\n
    \u5509\uff0c\u8fd9\u4e2a\u6211\u4e4b\u524d\u5199\u8fc7\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : nightwitch <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7ef4\u62a4\u4e00\u4e2a\u5806\u7ed3\u6784\uff0c\u4fdd\u6301\u5927\u81f4\u6709\u5e8f\u5c31\u53ef\u4ee5\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @luckyrayyy #2 
    @DonaldY #3 
    \u8fc7\u671f\u8fd9\u4e2a\u90fd\u6bd4\u8f83\u597d\u5904\u7406
    \u6781\u7aef\u60c5\u51b5 10 \u4e07\u6761\uff0c\u90fd\u6ca1\u8fc7\u671f\uff0c\u73b0\u5728\u8981\u63d2\u5165\u65b0\u7684\uff0c\u600e\u4e48\u5220\uff0c\u4e0d\u5f97\u904d\u5386<\/p>\n
    \u5b9a\u65f6\u5220\u9664\u6682\u4e0d\u8003\u8651\uff0c\u8fd9\u4e0d\u8fd8\u5f97\u989d\u5916\u5f04\u4e2a\u7ebf\u7a0b\u5e72\u8fd9\u4e8b\uff0c\u589e\u52a0\u590d\u6742\u5ea6\uff0c\u4f60\u8981\u662f\u505a redis,memcache \u8fd9\u6837\u7684\u4e1c\u897f\uff0c\u5b9a\u65f6\u5c31\u5f88\u5408\u7406\u5f88\u5fc5\u8981                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : rabbbit <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5fc5\u987b\u7528 map \u5417, key \u7684\u7c7b\u578b\u6ca1\u6709\u9650\u5236?                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rabbbit #6 map \u6211\u611f\u89c9\u4e0d\u884c\uff0ckey \u7c7b\u578b\u4e0d\u662f\u5173\u952e\u554a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : kamal <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5982\u679c\u65f6\u95f4\u548c\u8bfb\u53d6\u6b21\u6570\u6ca1\u6709\u51b2\u7a81\u7684\u8bdd\uff0c\u628a\u6761\u4ef6\u6539\u6210\u65f6\u95f4\u4e45\u7684\u5220\u9664\uff0c\u6b63\u5e38\u7684\u8bfb\u53d6\u53d8\u6210\u5220\u9664+\u63d2\u5165\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : chihiro2014 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rikka \u4e0d\u5f97\u904d\u5386\uff0chash \u76f4\u63a5 O(1)\u67e5\u627e\u7136\u540e\u5220\u9664\u4e0d\u884c\u4e48\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : rabbbit <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 js \u662f\u5355\u7ebf\u7a0b\u7684, \u5927\u91cf\u6570\u636e\u5b9a\u65f6\u904d\u5386\u4e0d\u5c31\u5361\u6b7b\u4e86\u5417?
    \u8fd8\u662f\u5efa\u8bae\u8bbf\u95ee\u7684\u65f6\u5019\u518d\u5220.<\/p>\n
    class Cache {
    \u3000 time = {};
    \u3000 data = {};
    \u3000 constructor(cleanInterval = 1000 * 60 * 10) {
    \u3000\u3000 this.cleanInterval = cleanInterval;
    \u3000}
    \u3000 get(key) {
    \u3000\u3000 if (this.data[key]) {
    \u3000\u3000\u3000 if (Date.now() – this.time[key] < this.cleanInterval) {
    \u3000\u3000\u3000\u3000 return this.data[key];
    \u3000\u3000\u3000} else {
    \u3000\u3000\u3000\u3000 delete this.data[key];
    \u3000\u3000\u3000\u3000 delete this.time[key];
    \u3000\u3000\u3000}
    \u3000\u3000}
    \u3000}<\/p>\n
    \u3000 set(key, value) {
    \u3000\u3000 this.data[key] = value;
    \u3000\u3000 this.time[key] = Date.now();
    \u3000}
    }<\/p>\n
    const c = new Cache(100);
    c.set(‘a’, 1);
    setTimeout(() => {
    \u3000 console.log(c.get(‘a’));
    }, 1000);                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rikka \u5c31\u662f LRU \u3002\u4f60\u968f\u4fbf\u627e\u4e2a\u8bed\u8a00\u770b\u770b\u522b\u4eba\u600e\u4e48\u5b9e\u73b0 LRU cache \u7684\u5c31\u61c2\u4e86\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @kamal #8 \u65f6\u95f4\u548c\u8bfb\u53d6\u6b21\u6570\u672c\u6765\u5c31\u6ca1\u5565\u51b2\u7a81\u554a\uff0c\u4f60\u8fd9\u610f\u601d\u662f\u8bfb\u53d6\u53d8\u6210\u4f1a\u66f4\u65b0\u65f6\u95f4\uff1f\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u987a\u4fbf\u5e38\u89c1\u7684 LRU \u5b9e\u73b0\u65b9\u6848\u662f\u4e00\u4e2a\u54c8\u5e0c\u8868 + \u4e00\u4e2a\u94fe\u8868\u3002\u7ec6\u8282\u81ea\u5df1\u53bb\u641c\u7d22\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 emmm \u53ef\u80fd\u662f\u4e00\u4e2a\u54c8\u5e0c\u8868 + \u4e24\u4e2a\u94fe\u8868\u2026\u2026 \u8fd9\u4e0d\u662f\u91cd\u70b9\uff0c\u53cd\u6b63\u662f\u6709\u65b9\u6848\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @chihiro2014 #9 O(1)\u524d\u63d0\u662f\u4f60\u5f97\u77e5\u9053 key \u554a\uff0c\u95ee\u9898\u662f\u5220\u9664\u7684\u65f6\u5019\u6839\u672c\u4e0d\u77e5\u9053 key \u662f\u4ec0\u4e48\uff0c\u5f97\u904d\u5386\u6839\u636e\u6761\u4ef6\u53bb\u627e\u7b26\u5408\u8981\u6c42\u7684 key \u7136\u540e\u5220\u9664\u554a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @ipwx #14 \u884c\u5427\u90fd\u8bf4\u662f LRU\uff0c\u6211\u7814\u7a76\u5b66\u4e60\u4e0b\u3002\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : noe132 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 https:\/\/www.npmjs.com\/package\/lru-cache                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : leapV3 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 LRU 
    hashmap                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : kamal <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rikka #12 \u662f\u7684\uff0c\u53d8\u6210\u4e86\u6309\u7167\u65f6\u95f4\u6392\u5e8f\u7684\u6570\u7ec4\u6216\u8005\u94fe\u8868\u3002
    \u6b63\u5e38\u8bfb\u53d6\uff1a\u8bfb\u53d6-\u5220\u9664-\uff08\u672a\u8fc7\u671f\uff09-\u63d2\u5165\u961f\u9996-\u8fd4\u56de
    \u8d85\u65f6\uff1a\u8bfb\u53d6-\u5220\u9664-\uff08\u5df2\u8fc7\u671f\uff09-\u8fd4\u56de\u7a7a
    \u957f\u5ea6\u8d85\u51fa\uff1b\u8bfb\u53d6-\u5220\u9664-\u63d2\u5165\u961f\u9996-\u5220\u9664\u961f\u5c3e-\u8fd4\u56de                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : rabbbit <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u62b1\u6b49,\u6211\u770b\u9519\u5e16\u5b50\u8981\u6c42\u4e86.\u6211\u4e0a\u9762\u90a3\u4e2a\u56de\u590d\u771f\u662f\u9519\u5230\u79bb\u8c31\u4e86.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @kamal #19 \u8fd9\u601d\u8def\u611f\u89c9\u6709\u70b9\u884c\u554a\uff0c\u8fd9\u4e48\u641e\uff0c\u5982\u679c\u4e00\u4e2a\u6570\u636e\uff08\u6ca1\u8fc7\u671f\uff09\u9891\u7e41\u88ab\u8bfb\u53d6\u5c31\u4f1a\u4e00\u76f4\u4fdd\u6301\u5728\u961f\u5217\u524d\u9762\uff0c\u9700\u8981\u5220\u9664\u7684\u65f6\u5019\u5c31\u4e0d\u5bb9\u6613\u88ab\u5220\uff0c\u90a3\u4e9b\u6ca1\u600e\u4e48\u88ab\u8bfb\u53d6\u7684\u5c31\u4f1a\u968f\u7740\u961f\u5217\u8c03\u6574\u843d\u5728\u961f\u5c3e\uff0c\u968f\u65f6\u51c6\u5907\u88ab\u5220\u9664~~                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : renmu123 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u770b\u4e00\u4e0b Redis \u7684\u5b9e\u73b0\u5c31\u53ef\u4ee5\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : di94sh <\/span>  <\/div>\n
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                                                                 \u627e\u4e2a cachetools \u4e4b\u7c7b\u7684\u5e93\u5457                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : xiaoming1992 <\/span>  <\/div>\n
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                                                                 \u5220\u9664\u7b97\u6cd5\u7684\u6307\u5bfc\u601d\u60f3\u662f\uff0c\u5220\u9664\u90a3\u4e9b\u8d8a\u65e7\u8bfb\u53d6\u6b21\u6570\u8d8a\u5c11\u7684\u6570\u636e<\/p>\n
    \u6743\u91cd\u600e\u4e48\u6837\u5462\uff1f\u4e00\u4e2a 1s \u524d\u8bfb\u53d6 1 \u6b21\u7684\u6570\u636e\u3001\u548c\u4e00\u4e2a 2s \u524d\u8bfb\u53d6 2 \u6b21\u7684\u6570\u636e\uff0c\u5e94\u8be5\u5220\u9664\u54ea\u4e2a\u5462\uff1f                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : zifangsky <\/span>  <\/div>\n
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                                                                 \u201c\u5220\u9664\u90a3\u4e9b\u8d8a\u65e7\u8bfb\u53d6\u6b21\u6570\u8d8a\u5c11\u7684\u6570\u636e\u201d\uff1f\u5230\u5e95\u662f\u5220\u9664\u6700\u65e7\u7684\u6570\u636e\uff08 LRU \uff09\u8fd8\u662f\u5220\u9664\u8bbf\u95ee\u6b21\u6570\u6700\u5c11\u7684\u6570\u636e\uff08 LFU \uff09\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : rikka <\/span>  <\/div>\n
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                                                                 @xiaoming1992 #24 
    @zifangsky #25 <\/p>\n
    \u5176\u5b9e\u90fd\u53ef\u4ee5\uff0c\u76ee\u524d\u6211\u7528 LRU \u5b9e\u73b0\u51fa\u6765\u4e86
    https:\/\/gist.github.com\/mkanako\/e8a279aa2ffd946bf7b3fd9c26479ef7