华为 OD 机试题:给定两个数 0<S, N<100000, S 为数列总和, N 为数列长度,求连续正整数列 - V2EX
6167

华为 OD 机试题:给定两个数 0<S, N<100000, S 为数列总和, N 为数列长度,求连续正整数列

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  •   6167 Dec 14, 2020 3457 views
    This topic created in 1981 days ago, the information mentioned may be changed or developed.
    有结果返回数列,无结果返回-1
    输入 525 6
    返回 85 86 87 88 89 90

    输入 3 5
    返回 -1

    题目倒是不难
    根据 (beg +end) *num/2 = sum
    倒推 beg= (2*sum/num-num+1)/2
    但是这种题怎么算才能满足 100%通过率?
    最高才 45%
    Supplement 1    Dec 21, 2020
    import sys def func1(sum, num): if sum > 0 & num > 0 & int(sum) == sum & int(num) == num: beg = (sum * 2 / num - num + 1) / 2 if beg % 1 == 0 & beg != 0: return [i for i in range(int(beg), int(beg) + num)] else: return -1 else: return -1 for line in sys.stdin: a = line.split() if len(a) != 2: print(-1) sum, num = a[0], a[1] if type(int(sum)) == type(int(num)) == type(1): print(func1(int(sum), int(num))) else: print(-1) 
    8 replies    2020-12-21 22:13:40 +08:00
    LewisHorse
        1
    LewisHorse  
       Dec 14, 2020 via Android
    判断无结果的条件是怎么写的?
    6167
        2
    6167  
    OP
       Dec 14, 2020
    @LewisHorse
    if sum>0 & num<0 & sum == int(sum) & num == int(num):
    return ......
    else:
    return -1
    xsonglive491
        3
    xsonglive491  
       Dec 14, 2020
    你直接判断 beg 是否是正整数就行了,(2*sum/num-num+1)为大于 0 的偶数
    6167
        4
    6167  
    OP
       Dec 14, 2020
    @xsonglive491 这个有,只考虑这一项才通过 35%
    xsonglive491
        5
    xsonglive491  
       Dec 14, 2020
    @6167 num <=0 or num*num > 2* sum or (2*sum/num-num+1) %2 !=0 :return -1
    Vanquish5419
        6
    Vanquish5419  
       Dec 16, 2020
    很简单啊,beg = s/n - (n-1)/2
    是大于等于 0 的整数就行
    lidlesseye11
        7
    lidlesseye11  
       Dec 16, 2020
    通过率是啥意思,测试 case 吗?那失败的 case 不给告诉的吗?
    另外建议楼主直接放出自己写的原版整段代码。。你这连用的什么语言都不知道。
    数学上是不难,可能是语言有什么特性哪里计算错了呢?
    6167
        8
    6167  
    OP
       Dec 21, 2020
    @lidlesseye11

    @LewisHorse

    代码已附
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