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#include <stdio.h> #include <stdlib.h> #define N 4 void perm(int*, int); int main(void) {     int num[N+1], i;     for(i = 1; i <= N; i++)         num[i] = i;     perm(num, 1);     return 0; } void perm(int* num, int i) {     int j, k, tmp;     if(i < N) {         for(j = i; j <= N; j++) {             tmp = num[j];             // &#26059;&#36681;&#35442;&#21312;&#27573;&#26368;&#21491;&#37002;&#25976;&#23383;&#33267;&#26368;&#24038;&#37002;             for(k = j; k > i; k--)                 num[k] = num[k-1];             num[i] = tmp;             perm(num, i+1);             // &#36996;&#21407;             for(k = i; k < j; k++)                 num[k] = num[k+1];             num[j] = tmp;         }     }     else {  // &#39023;&#31034;&#27492;&#27425;&#25490;&#21015;         for(j = 1; j <= N; j++)             printf("%d ", num[j]);         printf("\n");     } }