79 lines
1.0 KiB
C
Executable File
79 lines
1.0 KiB
C
Executable File
#include <stdio.h>
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#include <stdlib.h>
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void
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swap(int *a, int *b)
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{
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int temp = *a;
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*a = *b;
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*b = temp;
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return;
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}
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int
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next_permutation(int *arr, int n)
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{
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int i = n - 2;
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while (i >= 0 && arr[i] >= arr[i + 1]) {
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i--;
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}
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if (i < 0) {
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return 0;
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}
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int j = n - 1;
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while (arr[j] <= arr[i]) {
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j--;
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}
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swap(&arr[i], &arr[j]);
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int pt1 = i + 1, pt2 = n - 1;
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while (pt1 < pt2) {
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swap(&arr[pt1++], &arr[pt2--]);
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}
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return 1;
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}
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int
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main()
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{
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int n;
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if (scanf("%d", &n) != 1) {
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fprintf(stderr, "Error reading input\n");
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return 1;
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}
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if (n <= 0 || n >= 10) {
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return 1;
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}
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int *arr = (int *) malloc(n * sizeof(*arr));
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if (arr == NULL) {
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return 1;
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}
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for (int i = 0; i < n; i++) {
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arr[i] = i + 1;
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}
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do {
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for (int i = 0; i < n; i++) {
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printf("%d", arr[i]);
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}
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printf("\n");
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} while (next_permutation(arr, n));
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free(arr);
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return 0;
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}
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