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#include <stdio.h> #include <stdlib.h> #include <string.h> void swap(char** a, char** b) { char* temp = *a; *a = *b; *b = temp; } void reverse(char** s, int start, int end) { while (start < end) { swap(s + start++, s + end--); } } int next_permutation(int n, char** s) { for (int i = n - 2; i >= 0; --i) { if (strcmp(s[i], s[i + 1]) < 0) { for (int j = n - 1; j > i; --j) { if (strcmp(s[i], s[j]) < 0) { swap(s + i, s + j); reverse(s, i + 1, n - 1); return 1; } } } } return 0; } int main() { char** s; int n; scanf("%d", &n); s = malloc(n * sizeof(char*)); for (int i = 0; i < n; i++) { s[i] = malloc(11 * sizeof(char)); scanf("%s", s[i]); } do { for (int i = 0; i < n; i++) printf("%s%c", s[i], i == n - 1 ? '\n' : ' '); } while (next_permutation(n, s)); for (int i = 0; i < n; i++) free(s[i]); free(s); return 0; }
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Permutations of Strings
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