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标题: 简单的码农问题！！！！ [打印本页]

作者: woodangel 时间: 2012-9-20 22:19
标题: 简单的码农问题！！！！
比如，数组{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}
要找出那些数相加等于20，
注意可能是2个数也可能是多个数，不限制

作者: my8dacart 时间: 2012-9-20 22:34
提示: 作者被禁止或删除内容自动屏蔽

作者: 依然打老虎 时间: 2012-9-20 23:53
用个递归函数吧

作者: 今心 时间: 2012-9-20 23:55
大神居然来发帖来助？

作者: 牛clear 时间: 2012-9-20 23:57
拿20来拆，拆成2个数相加，拆成3个数相加，4，5 ... ...
这比上面的循环递归加方便多了。

作者: 今心 时间: 2012-9-20 23:58

my8dacart 发表于 2012-9-20 22:34
按不同的相加位数遍历所有可能出现的数值，这活计算机干起来得心应手。

不用所有的数，

因为是有顺序的排列。就算没顺序的，也可以先按顺序排列。

19+1=20，那么1后面的数就不用相加了
19+1=20，那么18比19小，18+1肯定不会是20.所以18可以从1后面的一个数加起

多位的也类些

作者: Pentium9 时间: 2012-9-21 00:01
大师居然会被这种问题难住？

作者: waln 时间: 2012-9-21 00:05
大一下学期的学生都能搞定

作者: hkkhhk 时间: 2012-9-21 00:07
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20 = 1 + 1 + 3 + 3 + 3 + 3 + 3 + 3
20 = 1 + 1 + 3 + 3 + 3 + 3 + 6
20 = 1 + 1 + 3 + 3 + 3 + 4 + 5
20 = 1 + 1 + 3 + 3 + 3 + 9
20 = 1 + 1 + 3 + 3 + 4 + 4 + 4
20 = 1 + 1 + 3 + 3 + 4 + 8
20 = 1 + 1 + 3 + 3 + 5 + 7
20 = 1 + 1 + 3 + 3 + 6 + 6
20 = 1 + 1 + 3 + 3 + 12
20 = 1 + 1 + 3 + 4 + 4 + 7
20 = 1 + 1 + 3 + 4 + 5 + 6
20 = 1 + 1 + 3 + 4 + 11
20 = 1 + 1 + 3 + 5 + 5 + 5
20 = 1 + 1 + 3 + 5 + 10
20 = 1 + 1 + 3 + 6 + 9
20 = 1 + 1 + 3 + 7 + 8
20 = 1 + 1 + 3 + 15
20 = 1 + 1 + 4 + 4 + 4 + 6
20 = 1 + 1 + 4 + 4 + 5 + 5
20 = 1 + 1 + 4 + 4 + 10
20 = 1 + 1 + 4 + 5 + 9
20 = 1 + 1 + 4 + 6 + 8
20 = 1 + 1 + 4 + 7 + 7
20 = 1 + 1 + 4 + 14
20 = 1 + 1 + 5 + 5 + 8
20 = 1 + 1 + 5 + 6 + 7
20 = 1 + 1 + 5 + 13
20 = 1 + 1 + 6 + 6 + 6
20 = 1 + 1 + 6 + 12
20 = 1 + 1 + 7 + 11
20 = 1 + 1 + 8 + 10
20 = 1 + 1 + 9 + 9
20 = 1 + 1 + 18
20 = 1 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3
20 = 1 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 5
20 = 1 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 4
20 = 1 + 2 + 2 + 2 + 2 + 2 + 2 + 7
20 = 1 + 2 + 2 + 2 + 2 + 2 + 3 + 3 + 3
20 = 1 + 2 + 2 + 2 + 2 + 2 + 3 + 6
20 = 1 + 2 + 2 + 2 + 2 + 2 + 4 + 5
20 = 1 + 2 + 2 + 2 + 2 + 2 + 9
20 = 1 + 2 + 2 + 2 + 2 + 3 + 3 + 5
20 = 1 + 2 + 2 + 2 + 2 + 3 + 4 + 4
20 = 1 + 2 + 2 + 2 + 2 + 3 + 8
20 = 1 + 2 + 2 + 2 + 2 + 4 + 7
20 = 1 + 2 + 2 + 2 + 2 + 5 + 6
20 = 1 + 2 + 2 + 2 + 2 + 11
20 = 1 + 2 + 2 + 2 + 3 + 3 + 3 + 4
20 = 1 + 2 + 2 + 2 + 3 + 3 + 7
20 = 1 + 2 + 2 + 2 + 3 + 4 + 6
20 = 1 + 2 + 2 + 2 + 3 + 5 + 5
20 = 1 + 2 + 2 + 2 + 3 + 10
20 = 1 + 2 + 2 + 2 + 4 + 4 + 5
20 = 1 + 2 + 2 + 2 + 4 + 9
20 = 1 + 2 + 2 + 2 + 5 + 8
20 = 1 + 2 + 2 + 2 + 6 + 7
20 = 1 + 2 + 2 + 2 + 13
20 = 1 + 2 + 2 + 3 + 3 + 3 + 3 + 3
20 = 1 + 2 + 2 + 3 + 3 + 3 + 6
20 = 1 + 2 + 2 + 3 + 3 + 4 + 5
20 = 1 + 2 + 2 + 3 + 3 + 9
20 = 1 + 2 + 2 + 3 + 4 + 4 + 4
20 = 1 + 2 + 2 + 3 + 4 + 8
20 = 1 + 2 + 2 + 3 + 5 + 7
20 = 1 + 2 + 2 + 3 + 6 + 6
20 = 1 + 2 + 2 + 3 + 12
20 = 1 + 2 + 2 + 4 + 4 + 7
20 = 1 + 2 + 2 + 4 + 5 + 6
20 = 1 + 2 + 2 + 4 + 11
20 = 1 + 2 + 2 + 5 + 5 + 5
20 = 1 + 2 + 2 + 5 + 10
20 = 1 + 2 + 2 + 6 + 9
20 = 1 + 2 + 2 + 7 + 8
20 = 1 + 2 + 2 + 15
20 = 1 + 2 + 3 + 3 + 3 + 3 + 5
20 = 1 + 2 + 3 + 3 + 3 + 4 + 4
20 = 1 + 2 + 3 + 3 + 3 + 8
20 = 1 + 2 + 3 + 3 + 4 + 7
20 = 1 + 2 + 3 + 3 + 5 + 6
20 = 1 + 2 + 3 + 3 + 11
20 = 1 + 2 + 3 + 4 + 4 + 6
20 = 1 + 2 + 3 + 4 + 5 + 5
20 = 1 + 2 + 3 + 4 + 10
20 = 1 + 2 + 3 + 5 + 9
20 = 1 + 2 + 3 + 6 + 8
20 = 1 + 2 + 3 + 7 + 7
20 = 1 + 2 + 3 + 14
20 = 1 + 2 + 4 + 4 + 4 + 5
20 = 1 + 2 + 4 + 4 + 9
20 = 1 + 2 + 4 + 5 + 8
20 = 1 + 2 + 4 + 6 + 7
20 = 1 + 2 + 4 + 13
20 = 1 + 2 + 5 + 5 + 7
20 = 1 + 2 + 5 + 6 + 6
20 = 1 + 2 + 5 + 12
20 = 1 + 2 + 6 + 11
20 = 1 + 2 + 7 + 10
20 = 1 + 2 + 8 + 9
20 = 1 + 2 + 17
20 = 1 + 3 + 3 + 3 + 3 + 3 + 4
20 = 1 + 3 + 3 + 3 + 3 + 7
20 = 1 + 3 + 3 + 3 + 4 + 6
20 = 1 + 3 + 3 + 3 + 5 + 5
20 = 1 + 3 + 3 + 3 + 10
20 = 1 + 3 + 3 + 4 + 4 + 5
20 = 1 + 3 + 3 + 4 + 9
20 = 1 + 3 + 3 + 5 + 8
20 = 1 + 3 + 3 + 6 + 7
20 = 1 + 3 + 3 + 13
20 = 1 + 3 + 4 + 4 + 4 + 4
20 = 1 + 3 + 4 + 4 + 8
20 = 1 + 3 + 4 + 5 + 7
20 = 1 + 3 + 4 + 6 + 6
20 = 1 + 3 + 4 + 12
20 = 1 + 3 + 5 + 5 + 6
20 = 1 + 3 + 5 + 11
20 = 1 + 3 + 6 + 10
20 = 1 + 3 + 7 + 9
20 = 1 + 3 + 8 + 8
20 = 1 + 3 + 16
20 = 1 + 4 + 4 + 4 + 7
20 = 1 + 4 + 4 + 5 + 6
20 = 1 + 4 + 4 + 11
20 = 1 + 4 + 5 + 5 + 5
20 = 1 + 4 + 5 + 10
20 = 1 + 4 + 6 + 9
20 = 1 + 4 + 7 + 8
20 = 1 + 4 + 15
20 = 1 + 5 + 5 + 9
20 = 1 + 5 + 6 + 8
20 = 1 + 5 + 7 + 7
20 = 1 + 5 + 14
20 = 1 + 6 + 6 + 7
20 = 1 + 6 + 13
20 = 1 + 7 + 12
20 = 1 + 8 + 11
20 = 1 + 9 + 10
20 = 1 + 19
20 = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2
20 = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 4
20 = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 3
20 = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 6
20 = 2 + 2 + 2 + 2 + 2 + 2 + 3 + 5
20 = 2 + 2 + 2 + 2 + 2 + 2 + 4 + 4
20 = 2 + 2 + 2 + 2 + 2 + 2 + 8
20 = 2 + 2 + 2 + 2 + 2 + 3 + 3 + 4
20 = 2 + 2 + 2 + 2 + 2 + 3 + 7
20 = 2 + 2 + 2 + 2 + 2 + 4 + 6
20 = 2 + 2 + 2 + 2 + 2 + 5 + 5
20 = 2 + 2 + 2 + 2 + 2 + 10
20 = 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3
20 = 2 + 2 + 2 + 2 + 3 + 3 + 6
20 = 2 + 2 + 2 + 2 + 3 + 4 + 5
20 = 2 + 2 + 2 + 2 + 3 + 9
20 = 2 + 2 + 2 + 2 + 4 + 4 + 4
20 = 2 + 2 + 2 + 2 + 4 + 8
20 = 2 + 2 + 2 + 2 + 5 + 7
20 = 2 + 2 + 2 + 2 + 6 + 6
20 = 2 + 2 + 2 + 2 + 12
20 = 2 + 2 + 2 + 3 + 3 + 3 + 5
20 = 2 + 2 + 2 + 3 + 3 + 4 + 4
20 = 2 + 2 + 2 + 3 + 3 + 8
20 = 2 + 2 + 2 + 3 + 4 + 7
20 = 2 + 2 + 2 + 3 + 5 + 6
20 = 2 + 2 + 2 + 3 + 11
20 = 2 + 2 + 2 + 4 + 4 + 6
20 = 2 + 2 + 2 + 4 + 5 + 5
20 = 2 + 2 + 2 + 4 + 10
20 = 2 + 2 + 2 + 5 + 9
20 = 2 + 2 + 2 + 6 + 8
20 = 2 + 2 + 2 + 7 + 7
20 = 2 + 2 + 2 + 14
20 = 2 + 2 + 3 + 3 + 3 + 3 + 4
20 = 2 + 2 + 3 + 3 + 3 + 7
20 = 2 + 2 + 3 + 3 + 4 + 6
20 = 2 + 2 + 3 + 3 + 5 + 5
20 = 2 + 2 + 3 + 3 + 10
20 = 2 + 2 + 3 + 4 + 4 + 5
20 = 2 + 2 + 3 + 4 + 9
20 = 2 + 2 + 3 + 5 + 8
20 = 2 + 2 + 3 + 6 + 7
20 = 2 + 2 + 3 + 13
20 = 2 + 2 + 4 + 4 + 4 + 4
20 = 2 + 2 + 4 + 4 + 8
20 = 2 + 2 + 4 + 5 + 7
20 = 2 + 2 + 4 + 6 + 6
20 = 2 + 2 + 4 + 12
20 = 2 + 2 + 5 + 5 + 6
20 = 2 + 2 + 5 + 11
20 = 2 + 2 + 6 + 10
20 = 2 + 2 + 7 + 9
20 = 2 + 2 + 8 + 8
20 = 2 + 2 + 16
20 = 2 + 3 + 3 + 3 + 3 + 3 + 3
20 = 2 + 3 + 3 + 3 + 3 + 6
20 = 2 + 3 + 3 + 3 + 4 + 5
20 = 2 + 3 + 3 + 3 + 9
20 = 2 + 3 + 3 + 4 + 4 + 4
20 = 2 + 3 + 3 + 4 + 8
20 = 2 + 3 + 3 + 5 + 7
20 = 2 + 3 + 3 + 6 + 6
20 = 2 + 3 + 3 + 12
20 = 2 + 3 + 4 + 4 + 7
20 = 2 + 3 + 4 + 5 + 6
20 = 2 + 3 + 4 + 11
20 = 2 + 3 + 5 + 5 + 5
20 = 2 + 3 + 5 + 10
20 = 2 + 3 + 6 + 9
20 = 2 + 3 + 7 + 8
20 = 2 + 3 + 15
20 = 2 + 4 + 4 + 4 + 6
20 = 2 + 4 + 4 + 5 + 5
20 = 2 + 4 + 4 + 10
20 = 2 + 4 + 5 + 9
20 = 2 + 4 + 6 + 8
20 = 2 + 4 + 7 + 7
20 = 2 + 4 + 14
20 = 2 + 5 + 5 + 8
20 = 2 + 5 + 6 + 7
20 = 2 + 5 + 13
20 = 2 + 6 + 6 + 6
20 = 2 + 6 + 12
20 = 2 + 7 + 11
20 = 2 + 8 + 10
20 = 2 + 9 + 9
20 = 2 + 18
20 = 3 + 3 + 3 + 3 + 3 + 5
20 = 3 + 3 + 3 + 3 + 4 + 4
20 = 3 + 3 + 3 + 3 + 8
20 = 3 + 3 + 3 + 4 + 7
20 = 3 + 3 + 3 + 5 + 6
20 = 3 + 3 + 3 + 11
20 = 3 + 3 + 4 + 4 + 6
20 = 3 + 3 + 4 + 5 + 5
20 = 3 + 3 + 4 + 10
20 = 3 + 3 + 5 + 9
20 = 3 + 3 + 6 + 8
20 = 3 + 3 + 7 + 7
20 = 3 + 3 + 14
20 = 3 + 4 + 4 + 4 + 5
20 = 3 + 4 + 4 + 9
20 = 3 + 4 + 5 + 8
20 = 3 + 4 + 6 + 7
20 = 3 + 4 + 13
20 = 3 + 5 + 5 + 7
20 = 3 + 5 + 6 + 6
20 = 3 + 5 + 12
20 = 3 + 6 + 11
20 = 3 + 7 + 10
20 = 3 + 8 + 9
20 = 3 + 17
20 = 4 + 4 + 4 + 4 + 4
20 = 4 + 4 + 4 + 8
20 = 4 + 4 + 5 + 7
20 = 4 + 4 + 6 + 6
20 = 4 + 4 + 12
20 = 4 + 5 + 5 + 6
20 = 4 + 5 + 11
20 = 4 + 6 + 10
20 = 4 + 7 + 9
20 = 4 + 8 + 8
20 = 4 + 16
20 = 5 + 5 + 5 + 5
20 = 5 + 5 + 10
20 = 5 + 6 + 9
20 = 5 + 7 + 8
20 = 5 + 15
20 = 6 + 6 + 8
20 = 6 + 7 + 7
20 = 6 + 14
20 = 7 + 13
20 = 8 + 12
20 = 9 + 11
20 = 10 + 10

作者: BeRush 时间: 2012-9-21 00:09
不需要这种循环遍历吧，肯定有比较简单的算法，比楼上的效率高n倍的

作者: hkkhhk 时间: 2012-9-21 00:11
20 = 1 + 2 + 3 + 4 + 10
20 = 1 + 2 + 3 + 5 + 9
20 = 1 + 2 + 3 + 6 + 8
20 = 1 + 2 + 3 + 14
20 = 1 + 2 + 4 + 5 + 8
20 = 1 + 2 + 4 + 6 + 7
20 = 1 + 2 + 4 + 13
20 = 1 + 2 + 5 + 12
20 = 1 + 2 + 6 + 11
20 = 1 + 2 + 7 + 10
20 = 1 + 2 + 8 + 9
20 = 1 + 2 + 17
20 = 1 + 3 + 4 + 5 + 7
20 = 1 + 3 + 4 + 12
20 = 1 + 3 + 5 + 11
20 = 1 + 3 + 6 + 10
20 = 1 + 3 + 7 + 9
20 = 1 + 3 + 16
20 = 1 + 4 + 5 + 10
20 = 1 + 4 + 6 + 9
20 = 1 + 4 + 7 + 8
20 = 1 + 4 + 15
20 = 1 + 5 + 6 + 8
20 = 1 + 5 + 14
20 = 1 + 6 + 13
20 = 1 + 7 + 12
20 = 1 + 8 + 11
20 = 1 + 9 + 10
20 = 1 + 19
20 = 2 + 3 + 4 + 5 + 6
20 = 2 + 3 + 4 + 11
20 = 2 + 3 + 5 + 10
20 = 2 + 3 + 6 + 9
20 = 2 + 3 + 7 + 8
20 = 2 + 3 + 15
20 = 2 + 4 + 5 + 9
20 = 2 + 4 + 6 + 8
20 = 2 + 4 + 14
20 = 2 + 5 + 6 + 7
20 = 2 + 5 + 13
20 = 2 + 6 + 12
20 = 2 + 7 + 11
20 = 2 + 8 + 10
20 = 2 + 18
20 = 3 + 4 + 5 + 8
20 = 3 + 4 + 6 + 7
20 = 3 + 4 + 13
20 = 3 + 5 + 12
20 = 3 + 6 + 11
20 = 3 + 7 + 10
20 = 3 + 8 + 9
20 = 3 + 17
20 = 4 + 5 + 11
20 = 4 + 6 + 10
20 = 4 + 7 + 9
20 = 4 + 16
20 = 5 + 6 + 9
20 = 5 + 7 + 8
20 = 5 + 15
20 = 6 + 14
20 = 7 + 13
20 = 8 + 12
20 = 9 + 11

作者: hkkhhk 时间: 2012-9-21 00:14
9楼代码

#include <StdAfx.h>
#include <iostream>
using namespace std;
#define target 20
#define len 19
int num[len] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};
int times[len] = {0};
FILE * f;
void fun(int sum, int start)
{
if(sum == target)
{
int i = 0;
int b;
for(; i < len; ++i)
{
for(int j = 0; j < times[i]; ++j)
{
b = i;
fprintf(f, "%d = %d", target, num[i]);
times[b]--;
goto st2;
}
}
st2:
for(; i < len; ++i)
{
for(int j = 0; j < times[i]; ++j)
fprintf(f, " + %d", num[i]);
}
times[b]++;
fprintf(f, "\r\n");
}
for(int i = start; i < len; ++i)
{
if(num[i] + sum <= target)
{
times[i]++;
fun(sum + num[i], i);
times[i]--;
}
}
}
void main(void)
{
f = fopen("d:\\desktop\\bbb.txt", "wb");
fun(0, 0);
system("pause");
}

复制代码

11楼代码

#include <StdAfx.h>
#include <iostream>
using namespace std;
int num[] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};
#define len 19
#define target 20
void fun(int sum, int start)
{
if(sum == target)
{
int i = 0;
for(; i < len; ++i)
{
if(num[i] < 0)
{
printf("%d = %d", target, -num[i++]);
break;
}
}
for(; i < len; ++i)
{
if(num[i] < 0)
{
printf(" + %d", -num[i]);
}
}
printf("\r\n");
}
for(int i = start; i < len; ++i)
{
if(num[i] > 0 && num[i] + sum <= target)
{
num[i] *= -1;
fun(sum - num[i], i + 1);
num[i] *= -1;
}
}
}
void main(void)
{
fun(0);
system("pause");
}

复制代码

作者: 国妓米兰 时间: 2012-9-21 00:16
大师应该用4维编程大法

作者: hydranana 时间: 2012-9-21 01:42

hkk真码农威武。

欢迎光临八达网 (https://www.8-da.com/)