qq_27038241 2018-12-05 11:47 采纳率: 0%
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已结题

同样的代码为什么js远比python快

做leetcode 188.买卖股票的最佳时机 IV的时候,几乎一样的代码为什么javascript的速度,远大于python

js

var maxProfit = function(k, prices) {
  if (prices.length < 2) return 0;
  if (k === 0) return 0;
  k = Math.min(parseInt(prices.length / 2), k); // k最大只能为股票天数的一半
  let buys = [],
      sells = [];
  for (let i = 0; i < k; ++i) {                 // buy和sell数组初始化
    buys.push(Number.MIN_SAFE_INTEGER);
    sells.push(0);
  }
  for (let price of prices) {
    buys[0] = Math.max(buys[0], - price);
    sells[0] = Math.max(sells[0], buys[0] + price);
    for (let i = 1; i < k; ++i) {
      buys[i] = Math.max(buys[i], sells[i-1] - price);
      sells[i] = Math.max(sells[i], buys[i] + price);
    }
  }
  return sells[sells.length - 1];
};

python

import time
class Solution:
    def maxProfit(self, k, prices):
        s=time.time()
        if len(prices) < 2:
            return 0
        if (k == 0) :
            return 0
        k = min(int(len(prices) / 2), k)
        buys = []
        sells = []
        tmp=max(prices)
        for i in range(k):
            buys.append(-tmp)
            sells.append(0)

        for  price in prices:
            buys[0] = max(buys[0], - price)
            sells[0] = max(sells[0], buys[0] + price)
            for i in range(1,k):
                buys[i] = max(buys[i], sells[i-1] - price)
                sells[i] = max(sells[i], buys[i] + price)
        print(sells[ - 1])
        print(time.time()-s)
        return sells[ - 1]

例子
js只要0.3s ,python 需要30s

k=1000000000
prices=[106,373,495,46,359,919,906,440,783,583,784,73,238,701,972,308,165,774,990,675,737,990,713,157,211,880,961,132,980,136,285,239,628,221,948,939,28,541,414,180,171,640,297,873,59,814,832,611,868,633,101,67,396,264,445,548,257,656,624,71,607,67,836,14,373,205,434,203,661,793,45,623,140,67,177,885,155,764,363,269,599,32,228,111,102,565,918,592,604,244,982,533,781,604,115,429,33,894,778,885,145,888,577,275,644,824,277,302,182,94,479,563,52,771,544,794,964,827,744,366,548,761,477,434,999,86,1000,5,99,311,346,609,778,937,372,793,754,191,592,860,748,297,610,386,146,220,7,113,657,438,482,700,158,884,877,964,777,139,809,489,383,92,581,970,899,947,864,443,490,825,674,906,402,270,416,611,949,476,775,899,837,796,227,232,226,11,266,889,215,6,182,430,5,706,994,128,359,841,439,263,491,689,638,485,763,695,135,800,763,54,569,387,112,316,193,675,546,531,954,571,208,282,557,892,469,875,765,592,374,276,892,843,625,180,249,292,477,882,837,112,46,667,187,93,418,790,903,12,978,510,647,446,597,958,678,897,420,907,256,170,669,920,711,635,995,259,994,634,583,175,380,435,942,739,921,132,455,986,567,464,301,10,579,84,745,717,588,414,375,319,770,310,510,521,88,445,59,460,120,765,480,441,169,374,180,947,179,346,490,417,149,140,577,624,427,238,341,686,623,228,672,859,372,938,567,141,133,671,255,997,272,591,115,340,692,531,235,123,677,980,31,774,135,194,956,723,779,375,546,59,695,616,416,362,38,145,782,184,418,806,444,177,360,485,941,998,85,840,740,545,49,570,17,824,845,749,177,727,238,656,787,425,473,323,683,578,442,436,444,595,367,44,467,93,507,949,598,579,471,1,347,982,232,878,217,845,777,284,527,529,100,482,456,814,457,251,494,419,922,139,706,384,954,365,680,70,810,764,820,992,622,29,697,294,553,655,63,934,827,157,680,812,729,486,403,151,988,926,460,193,294,423,774,715,906,957,598,929,339,119,686,88,228,803,806,743,430,315,224,712,724,69,606,411,271,700,520,179,916,490,652,319,69,245,827,185,200,911,363,335,50,353,551,737,15,429,966,766,307,829,379,184,779,239,254,904,262,719,321,380,253,564,348,878,570,470,313,752,563,164,301,239,856,491,154,795,640,199,940,420,201,254,400,865,886,819,424,292,257,572,112,590,984,421,639,705,707,779,660,4,817,265,465,737,56,564,797,178,552,988,621,98,665,379,607,300,439,269,196,94,860,540,830,756,294,806,321,930,623,206,440,730,829,566,420,488,49,438,447,294,548,804,514,45,383,431,373,424,11,377,868,559,316,831,464,211,710,803,680,665,39,523,951,219,293,909,838,708,663,627,220,100,565,269,982,236,185,194,697,556,767,541,360,103,497,271,919,19,206,73,393,50,421,466,970,329,105,618,17,687,578,260,759,366,334,686,613,616,893,351,847,861,452,454,454,88,135,357,194,220,504,36,916,246,718,172,395,292,613,533,662,983,701,877,842,445,263,529,679,526,31,385,918,898,584,846,474,648,67,331,890,174,766,274,476,414,701,835,537,531,578,7,479,906,93,667,735,435,899,49,953,854,843,326,322,13,865,791,828,686,760,957,655,601,406,185,738,788,519,874,630,440,839,511,149,715,566,988,0,354,498,81,193,335,196,157,515,590,768,366,287,386,502,143,547,659,616,822,479,813,497,222,285,6,453,363,906,388,733,804,624,963,634,319,817,674,754,378,999,373,793,419,246,274,960,1,130,186,576,382,204,227,607,435,299,790,603,196,236,955,654,812,214,297,926,721,977,568,339,913,297,621,783,242,257,483,325,998,164,586,782,597,210,522,369,676,339,626,650,634,477,793,85,12,695,655,53,287,730,0,689,225,805,593,430,610,963,172,148,740,579,16,523,570,802,627,220,664,945,788,500,90,410,916,481,454,538,622,161,373,523,757,446,855,958,390,333,927,253,814,442,77,325,14,655,502,200,791,58,714,951,370,557,261,859,199,46,775,249,369,233,321,733,310,503,539,618,839,272,315,999,229,390,359,528,334,878,342,977,869,704,564,506,867,77,248,674,557,258,710,126,617,531,969,289,578,947,103,581,599,918,686,143,253,56,393,58,144,211,806,285,635,203,194,884,687,653,856,688,623,568,394,749,302,534,631,894,167,111,227,296,41,854,81,147,656,319,748,530,457,340,223,896,77,166,974,659,36,338,177,496,483,690,569,504,211,554,758,732,660,61,62,669,273,0,616,899,789,380,386,357,403,251,926,636,419,148,820,774,485,497,370,907,973,255,277,341,466,254,333,219,819,521,974,213,590,981,697,927,904,717,726,574,94,625,991,378,249,388,786,355,69,318,357,467,695,825,585,940,323,993,549,485,564,833,530,398,789,608,59,541,915,81,681,544,460,318,954,764,879,708,258,276,259,505,649,529,824,914,660,490,666,676,618,339,712,981,802,239,605,270,29,491,41,243,361,644,327,472,460,725,864,129,142,610,782,935,929,63,865,287,316,740,212,152,567,620,591,394,805,586,177,918,516,911,944,427,128,778,930,965,27,633,534,567,575,247,691,571,775,456,622,219,698,772,305,27,810,690,555,222,877,985,493,202,84,180,133,129,539,151,275,234,999,676,629,715,839,6,789,663,467,435,275,580,296,8,73,849,456,681,794,954,543,602,615,4,131,593,778,175,587,670,88,648,79,703,99,457,261,722,357,966,724,523,612,610,376,575,174,2,53,637,478,850,250,238,344,381,543,686,761,582,598,804,12,128,928,133,998,188,598,590,507,898,402,771,703,912,744,317,300,852,631,767,157,278,520,452,721,560,112,206,69,317,498,942,942,963,347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  • threenewbee 2018-12-05 14:05
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    你用的是什么js引擎,如果是google v8(chrome内核的客户端和nodejs服务器端),它有黑科技,虽然说是js,但是基本上是编译型语言的速度。

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