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1043.c
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1043.c
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#include <stdio.h>
#include <stdlib.h>
#define MAXN 1000 + 10
typedef struct Node {
int data;
struct Node *lc, *rc;
} Node;
Node *newNode(int data) {
Node *newNode = (Node*)malloc(sizeof(Node));
newNode->data = data;
newNode->lc = newNode->rc = NULL;
return newNode;
}
void insert(Node **root, int data) {
if (!(*root)) *root = newNode(data);
else {
if (data < (*root)->data) insert(&(*root)->lc, data);
else insert(&(*root)->rc, data);
}
}
int cnt = 0;
int pOrd[MAXN];
void preOrder(Node *root) {
if (root) pOrd[cnt++] = root->data;
if (root->lc) preOrder(root->lc);
if (root->rc) preOrder(root->rc);
}
int pOrdM[MAXN];
void preOrderMirror(Node *root) {
if (root) pOrdM[cnt++] = root->data;
if (root->rc) preOrderMirror(root->rc);
if (root->lc) preOrderMirror(root->lc);
}
int pstOrd[MAXN];
void postOrder(Node *root) {
if (root->lc) postOrder(root->lc);
if (root->rc) postOrder(root->rc);
if (root) pstOrd[cnt++] = root->data;
}
int pstOrdM[MAXN];
void postOrderMirror(Node *root) {
if (root->rc) postOrderMirror(root->rc);
if (root->lc) postOrderMirror(root->lc);
if (root) pstOrdM[cnt++] = root->data;
}
int a[MAXN];
int main() {
int n;
scanf("%d", &n);
Node *root = NULL;
for (int i = 0; i < n; i++) {
scanf("%d", &a[i]);
insert(&root, a[i]);
}
cnt = 0;
preOrder(root);
cnt = 0;
preOrderMirror(root);
int flag = 1;
for (int i = 0; i < n; i++) {
if (a[i] != pOrd[i]) {
flag = 0;
break;
}
}
int flag2 = 1;
for (int i = 0; i < n; i++) {
if (a[i] != pOrdM[i]) {
flag2 = 0;
break;
}
}
if (!flag && !flag2) printf("NO\n");
if (flag) {
printf("YES\n");
cnt = 0;
postOrder(root);
for (int i = 0; i < n; i++) {
if (i != n - 1) printf("%d ", pstOrd[i]);
else printf("%d\n", pstOrd[i]);
}
} else if (flag2) {
printf("Yes\n");
cnt = 0;
postOrderMirror(root);
for (int i = 0; i < n; i++) {
if (i != n - 1) printf("%d ", pstOrdM[i]);
else printf("%d\n", pstOrdM[i]);
}
}
return 0;
}