[已解决]Python：每日一题 373

扁扁

观摩大佬们的解答

山岂乎不在高

山岂乎不在高 发表于 2020-4-12 00:20
def p373(a):
    s=0
    a=[0]+a+[0]

a=a[i-1]=a[i+1]=0
应该是
a[i]=a[i-1]=a[i+1]=0
就是改不过来

山岂乎不在高

[ 本帖最后由 山岂乎不在高 于 2020-4-13 00:12 编辑 ]\n\ndef p373(a):
    s=0
    result=set()
    a=[0]+a+[0]
    while True:
        if sum(a)==0:
            result-={0,len(a)-1}
            print(result)
            return s
        i=a.index(max(a))
        result|={i-1,i+1}
        s+=a[i+1]+a[i-1]
        a[i]=a[i+1]=a[i-1]=0

NAMELESSONE

def solve(cost):
    length = len(cost)
    i = -1
    value = 0
    while i < length - 3:
        if cost[i+1] < cost[i + 2] and cost[i + 2] < cost[i + 3] or cost[i + 1] >=  cost[i+2]:
            value += cost[i + 2]
            i += 2
        else :
            value += cost[i + 1]
            i += 1
    if i == length - 3:
        value += cost[i+2]
    return value

zltzlt

TJBEST 发表于 2020-4-11 20:06
最简单的方法，利用递推式进行循环迭代，比dp快

64 ms

陈尚涵

不好理解，散了散了

zltzlt

塔利班 发表于 2020-4-11 20:36

116 ms

zltzlt

风魔孤行者 发表于 2020-4-11 22:15

输入以下数据超时：

cost = [841,462,566,398,243,248,238,650,989,576,361,126,334,729,446,897,953,38,195,679,65,707,196,705,569,275,259,872,630,965,978,109,56,523,851,887,91,544,598,963,305,481,959,560,454,883,50,216,732,572,511,156,177,831,122,667,548,978,771,880,922,777,990,498,525,317,469,151,874,202,519,139,670,341,514,469,858,913,94,849,839,813,664,163,3,802,21,634,944,901,446,186,843,742,330,610,932,614,625,169,833,4,81,55,124,294,71,24,929,534,621,543,417,534,427,327,179,90,341,949,368,692,646,290,488,145,273,617,596,82,538,751,80,616,763,826,932,184,630,478,163,925,259,237,839,602,60,786,603,413,816,278,4,35,243,64,631,405,23,638,618,829,481,877,756,482,999,973,718,157,262,752,931,882,741,40,77,535,542,879,607,879,321,46,210,116,244,830,591,285,382,925,48,497,913,203,239,696,162,623,291,525,950,27,546,293,108,577,672,354,256,3,671,998,22,989,557,424,251,923,542,243,46,488,80,374,372,334,190,817,150,742,362,196,75,193,162,645,859,758,433,903,199,289,175,303,475,818,213,576,181,668,243,297,572,549,840,161,292,719,226,338,981,345,203,655,210,65,111,746,76,935,406,646,976,567,32,726,638,674,727,861,426,297,349,464,973,341,452,826,223,805,940,458,468,967,107,345,987,553,407,916,103,324,367,864,74,946,712,596,105,194,79,634,855,703,70,170,543,208,739,632,663,880,857,824,258,743,488,659,647,470,958,492,211,927,356,488,744,570,143,674,502,589,270,80,6,463,506,556,495,713,407,229,689,280,162,454,757,565,267,575,417,948,607,269,852,938,560,24,222,580,604,800,628,487,485,615,796,384,555,226,412,445,503,810,949,966,28,768,83,213,883,963,831,390,951,378,497,440,780,209,734,290,96,398,146,56,445,880,910,858,671,164,552,686,748,738,837,556,710,787,343,137,298,685,909,828,499,816,538,604,652,7,272,729,529,343,443,593,992,434,588,936,261,873,64,177,827,172,712,628,609,328,672,376,628,441,9,92,525,222,654,699,134,506,934,178,270,770,994,158,653,199,833,802,553,399,366,818,523,447,420,957,669,267,118,535,971,180,469,768,184,321,712,167,867,12,660,283,813,498,192,740,696,421,504,795,894,724,562,234,110,88,100,408,104,864,473,59,474,922,759,720,69,490,540,962,461,324,453,91,173,870,470,292,394,771,161,777,287,560,532,339,301,90,411,387,59,67,828,775,882,677,9,393,128,910,630,396,77,321,642,568,817,222,902,680,596,359,639,189,436,648,825,46,699,967,202,954,680,251,455,420,599,20,894,224,47,266,644,943,808,653,563,351,709,116,849,38,870,852,333,829,306,881,203,660,266,540,510,748,840,821,199,250,253,279,672,472,707,921,582,713,900,137,70,912,51,250,188,967,14,608,30,541,424,813,343,297,346,27,774,549,931,141,81,120,342,288,332,967,768,178,230,378,800,408,272,596,560,942,612,910,743,461,425,878,254,929,780,641,657,279,160,184,585,651,204,353,454,536,185,550,428,125,889,436,906,99,942,355,666,746,964,936,661,515,978,492,836,468,867,422,879,92,438,802,276,805,832,649,572,638,43,971,974,804,66,100,792,878,469,585,254,630,309,172,361,906,628,219,534,617,95,190,541,93,477,933,328,984,117,678,746,296,232,240,532,643,901,982,342,918,884,62,68,835,173,493,252,382,862,672,803,803,873,24,431,580,257,457,519,388,218,970,691,287,486,274,942,184,817,405,575,369,591,713,158,264,826,870,561,450,419,606,925,710,758,151,533,405,946,285,86,346,685,153,834,625,745,925,281,805,99,891,122,102,874,491,64,277,277,840,657,443,492,880,925,65,880,393,504,736,340,64,330,318,703,949,950,887,956,39,595,764,176,371,215,601,435,249,86,761,793,201,54,189,451,179,849,760,689,539,453,450,404,852,709,313,529,666,545,399,808,290,848,129,352,846,2,266,777,286,22,898,81,299,786,949,435,434,695,298,402,532,177,399,458,528,672,882,90,547,690,935,424,516,390,346,702,781,644,794,420,116,24,919,467,543,58,938,217,502,169,457,723,122,158,188,109,868,311,708,8,893,853,376,359,223,654,895,877,709,940,195,323,64,51,807,510,170,508,155,724,784,603,67,316,217,148,972,19,658,5,762,618,744,534,956,703,434,302,541,997,214,429,961,648,774,244,684,218,49,729,990,521,948,317,847,76,566,415,874,399,613,816,613,467,191]

Fallenight

import random

cost = [1,100,1,1,1,100,1,1,100,1]
step = [1,2]
start = [0,1]
mincost = 0
s = 0
stop = 0
for i in cost:
        mincost += i
while True:
        level = random.choice(start)
        sumcost = 0
        while level < len(cost):
                sumcost += cost[level]
                s = random.choice(step)
                level += s
        if mincost == sumcost:
                stop += 1
        elif mincost > sumcost:
                mincost = sumcost
                stop = 0
                print("变啦，现在是：%d"%mincost)
        if stop == 3:
                break
print("最小值是:%d"%mincost)

zltzlt

kinkon 发表于 2020-4-11 22:30
虽然测试用例是对的，但是总感觉哪里有问题

空间换时间

第一个 108 ms，第二个 68 ms

zltzlt

l0stparadise 发表于 2020-4-11 23:26

72 ms

zltzlt

山岂乎不在高 发表于 2020-4-12 00:20
[ 本帖最后由 山岂乎不在高 于 2020-4-13 00:10 编辑 ]\n\ndef p373(a):
    s=0
    a=[0]+a+[0]

解答错误

输入：[0, 1, 2, 2]
输出：3
预期结果：2

zltzlt

钙硼钡锗 发表于 2020-4-12 00:58

输入以下数据超时：

[841, 462, 566, 398, 243, 248, 238, 650, 989, 576, 361, 126, 334, 729, 446, 897, 953, 38, 195, 679, 65, 707, 196, 705, 569, 275, 259, 872, 630, 965, 978, 109, 56, 523, 851, 887, 91, 544, 598, 963, 305, 481, 959, 560, 454, 883, 50, 216, 732, 572, 511, 156, 177, 831, 122, 667, 548, 978, 771, 880, 922, 777, 990, 498, 525, 317, 469, 151, 874, 202, 519, 139, 670, 341, 514, 469, 858, 913, 94, 849, 839, 813, 664, 163, 3, 802, 21, 634, 944, 901, 446, 186, 843, 742, 330, 610, 932, 614, 625, 169, 833, 4, 81, 55, 124, 294, 71, 24, 929, 534, 621, 543, 417, 534, 427, 327, 179, 90, 341, 949, 368, 692, 646, 290, 488, 145, 273, 617, 596, 82, 538, 751, 80, 616, 763, 826, 932, 184, 630, 478, 163, 925, 259, 237, 839, 602, 60, 786, 603, 413, 816, 278, 4, 35, 243, 64, 631, 405, 23, 638, 618, 829, 481, 877, 756, 482, 999, 973, 718, 157, 262, 752, 931, 882, 741, 40, 77, 535, 542, 879, 607, 879, 321, 46, 210, 116, 244, 830, 591, 285, 382, 925, 48, 497, 913, 203, 239, 696, 162, 623, 291, 525, 950, 27, 546, 293, 108, 577, 672, 354, 256, 3, 671, 998, 22, 989, 557, 424, 251, 923, 542, 243, 46, 488, 80, 374, 372, 334, 190, 817, 150, 742, 362, 196, 75, 193, 162, 645, 859, 758, 433, 903, 199, 289, 175, 303, 475, 818, 213, 576, 181, 668, 243, 297, 572, 549, 840, 161, 292, 719, 226, 338, 981, 345, 203, 655, 210, 65, 111, 746, 76, 935, 406, 646, 976, 567, 32, 726, 638, 674, 727, 861, 426, 297, 349, 464, 973, 341, 452, 826, 223, 805, 940, 458, 468, 967, 107, 345, 987, 553, 407, 916, 103, 324, 367, 864, 74, 946, 712, 596, 105, 194, 79, 634, 855, 703, 70, 170, 543, 208, 739, 632, 663, 880, 857, 824, 258, 743, 488, 659, 647, 470, 958, 492, 211, 927, 356, 488, 744, 570, 143, 674, 502, 589, 270, 80, 6, 463, 506, 556, 495, 713, 407, 229, 689, 280, 162, 454, 757, 565, 267, 575, 417, 948, 607, 269, 852, 938, 560, 24, 222, 580, 604, 800, 628, 487, 485, 615, 796, 384, 555, 226, 412, 445, 503, 810, 949, 966, 28, 768, 83, 213, 883, 963, 831, 390, 951, 378, 497, 440, 780, 209, 734, 290, 96, 398, 146, 56, 445, 880, 910, 858, 671, 164, 552, 686, 748, 738, 837, 556, 710, 787, 343, 137, 298, 685, 909, 828, 499, 816, 538, 604, 652, 7, 272, 729, 529, 343, 443, 593, 992, 434, 588, 936, 261, 873, 64, 177, 827, 172, 712, 628, 609, 328, 672, 376, 628, 441, 9, 92, 525, 222, 654, 699, 134, 506, 934, 178, 270, 770, 994, 158, 653, 199, 833, 802, 553, 399, 366, 818, 523, 447, 420, 957, 669, 267, 118, 535, 971, 180, 469, 768, 184, 321, 712, 167, 867, 12, 660, 283, 813, 498, 192, 740, 696, 421, 504, 795, 894, 724, 562, 234, 110, 88, 100, 408, 104, 864, 473, 59, 474, 922, 759, 720, 69, 490, 540, 962, 461, 324, 453, 91, 173, 870, 470, 292, 394, 771, 161, 777, 287, 560, 532, 339, 301, 90, 411, 387, 59, 67, 828, 775, 882, 677, 9, 393, 128, 910, 630, 396, 77, 321, 642, 568, 817, 222, 902, 680, 596, 359, 639, 189, 436, 648, 825, 46, 699, 967, 202, 954, 680, 251, 455, 420, 599, 20, 894, 224, 47, 266, 644, 943, 808, 653, 563, 351, 709, 116, 849, 38, 870, 852, 333, 829, 306, 881, 203, 660, 266, 540, 510, 748, 840, 821, 199, 250, 253, 279, 672, 472, 707, 921, 582, 713, 900, 137, 70, 912, 51, 250, 188, 967, 14, 608, 30, 541, 424, 813, 343, 297, 346, 27, 774, 549, 931, 141, 81, 120, 342, 288, 332, 967, 768, 178, 230, 378, 800, 408, 272, 596, 560, 942, 612, 910, 743, 461, 425, 878, 254, 929, 780, 641, 657, 279, 160, 184, 585, 651, 204, 353, 454, 536, 185, 550, 428, 125, 889, 436, 906, 99, 942, 355, 666, 746, 964, 936, 661, 515, 978, 492, 836, 468, 867, 422, 879, 92, 438, 802, 276, 805, 832, 649, 572, 638, 43, 971, 974, 804, 66, 100, 792, 878, 469, 585, 254, 630, 309, 172, 361, 906, 628, 219, 534, 617, 95, 190, 541, 93, 477, 933, 328, 984, 117, 678, 746, 296, 232, 240, 532, 643, 901, 982, 342, 918, 884, 62, 68, 835, 173, 493, 252, 382, 862, 672, 803, 803, 873, 24, 431, 580, 257, 457, 519, 388, 218, 970, 691, 287, 486, 274, 942, 184, 817, 405, 575, 369, 591, 713, 158, 264, 826, 870, 561, 450, 419, 606, 925, 710, 758, 151, 533, 405, 946, 285, 86, 346, 685, 153, 834, 625, 745, 925, 281, 805, 99, 891, 122, 102, 874, 491, 64, 277, 277, 840, 657, 443, 492, 880, 925, 65, 880, 393, 504, 736, 340, 64, 330, 318, 703, 949, 950, 887, 956, 39, 595, 764, 176, 371, 215, 601, 435, 249, 86, 761, 793, 201, 54, 189, 451, 179, 849, 760, 689, 539, 453, 450, 404, 852, 709, 313, 529, 666, 545, 399, 808, 290, 848, 129, 352, 846, 2, 266, 777, 286, 22, 898, 81, 299, 786, 949, 435, 434, 695, 298, 402, 532, 177, 399, 458, 528, 672, 882, 90, 547, 690, 935, 424, 516, 390, 346, 702, 781, 644, 794, 420, 116, 24, 919, 467, 543, 58, 938, 217, 502, 169, 457, 723, 122, 158, 188, 109, 868, 311, 708, 8, 893, 853, 376, 359, 223, 654, 895, 877, 709, 940, 195, 323, 64, 51, 807, 510, 170, 508, 155, 724, 784, 603, 67, 316, 217, 148, 972, 19, 658, 5, 762, 618, 744, 534, 956, 703, 434, 302, 541, 997, 214, 429, 961, 648, 774, 244, 684, 218, 49, 729, 990, 521, 948, 317, 847, 76, 566, 415, 874, 399, 613, 816, 613, 467, 191]

zltzlt

阴阳神万物主 发表于 2020-4-12 02:22
难度评级：简单
要素分析：贪心
代码：

解答错误

输入：[1, 2, 2, 0]
输出：3
预期结果：2

zltzlt

March2615 发表于 2020-4-12 18:57
每天只能刷到前一天的我也是不懂

92 ms

zltzlt

whosyourdaddy 发表于 2020-4-12 22:47
def func373(cost):
    n = len(cost)
    for i in range(2,n):

72 ms

zltzlt

山岂乎不在高 发表于 2020-4-12 23:40
[ 本帖最后由 山岂乎不在高 于 2020-4-13 00:12 编辑 ]\n\ndef p373(a):
    s=0
    result=set()

还是有错

zltzlt

NAMELESSONE 发表于 2020-4-13 10:54

解答错误

输入：[0, 0, 0, 1]
输出：1
预期结果：0

zltzlt

Fallenight 发表于 2020-4-13 15:11
import random

cost = [1,100,1,1,1,100,1,1,100,1]

解答错误

输入：[0, 0, 0, 1]
输出：0
预期结果：1

阴阳神万物主

zltzlt 发表于 2020-4-13 17:29
解答错误

输入：[1, 2, 2, 0]

这个修好了。

def solve(cost:'list of int >=0')->int:
    i,u = -1,0
    while i < len(cost)-5:#结束循环后最多只剩4级台阶要上
        a,b = i+1,i+2
        i = a if cost[a]<cost[b] else b
        u += cost[i]
    return u+min(sum(cost[i+1::+2]),sum(cost[i+2::+2]),sum(cost[-3:-1]))

if __name__ == '__main__':
    print('示例1 输出：',solve([10, 15, 20]))
    print('示例2 输出：',solve([1, 100, 1, 1, 1, 100, 1, 1, 100, 1]))
    print('自测 输出：',solve([1,1]))
    print('之前错的：',solve([1, 2, 2, 0]))