[KOI]전국본선 2013 중등부 두번째 문제

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#include <stdio.h>   int main() {     int n;     int after[30] = { 0, }, before[30] = { 0, };     scanf("%d", &n);     for (int i = 0; i < n; ++i) {         scanf("%d", &after[i]);     }     int cur = 0, count = 0;     while (count < n) {         while (before[cur] != 0) {             cur = (cur + 1) % n;         }         before[cur] = after[count++];         cur = (before[cur] + cur) % n;     }       printf("%d\n", n);     for (int i = 0; i < n; ++i) {         printf("%d ", before[i]);     }       return 0; }