我在这里检查了几乎所有类似的帖子,但我不知道如何做我想做的事。我正在尝试在 C 程序中输入一个输入,比如说数字 4,然后程序在数组中返回以下数字:
1
2
3
4
12
13
14
23
24
34
123
134
124
1234
更清楚地说:如果输入数字是 4,那么我想使用数字 1-4 并生成所有可能的数字组合(从 1 位组合到 4 位组合)而没有数字重复。
我尝试了以下代码:
#include <stdio.h>
/* Prints out a combination like {1, 2} */
void printc(int comb[], int k) {
printf("{");
int i;
for (i = 0; i < k; ++i)
printf("%d, ", comb[i] + 1);
printf("\\b\\b}\\n");
}
int next_comb(int comb[], int k, int n) {
int i = k - 1;
++comb[i];
while ((i >= 0) && (comb[i] >= n - k + 1 + i)) {
--i;
++comb[i];
}
if (comb[0] > n - k) /* Combination (n-k, n-k+1, ..., n) reached */
return 0; /* No more combinations can be generated */
/* comb now looks like (..., x, n, n, n, ..., n).
Turn it into (..., x, x + 1, x + 2, ...) */
for (i = i + 1; i < k; ++i)
comb[i] = comb[i - 1] + 1;
return 1;
}
int main(int argc, char *argv[]) {
int n = 5; /* The size of the set; for {1, 2, 3, 4} it's 4 */
int k = 3; /* The size of the subsets; for {1, 2}, {1, 3}, ... it's 2 */
int comb[16]; /* comb[i] is the index of the i-th element in the
combination */
/* Setup comb for the initial combination */
int i;
for (i = 0; i < k; ++i)
comb[i] = i;
/* Print the first combination */
printc(comb, k);
/* Generate and print all the other combinations */
while (next_comb(comb, k, n))
printc(comb, k);
return 0;
}
上面的程序打印结果。我想以某种方式得到结果..但我不能,因为上面的代码以一种奇怪的方式打印结果。