树专题（集训）

数据结构上机测试4.1:二叉树的遍历与应用1

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#define MAXN 200  
  
void build(int n, char *s1, char *s2, char *s){  
    if(n<=0) return;  
    int p = strchr(s2, s1[0]) - s2;  
    build(p, s1+1, s2, s);  
    build(n-p-1, s1+p+1, s2+p+1, s+p);  
    s[n-1] = s1[0];  
}  
  
int main(){  
    char s1[MAXN], s2[MAXN], s[MAXN];  
    scanf("%s %s", s1, s2);  
    int len = strlen(s1);  
    build(len, s1, s2, s);  
    s[len] = '\0';  
    printf("%s", s);  
    return 0;  
}  
  

数据结构实验之二叉树的建立与遍历

#include <stdio.h>  
#include <stdlib.h>  
  
typedef int ElemType;  
typedef int Status;  
  
  
typedef struct Node{  
    ElemType data;  
    struct Node *lchild, *rchild;  
}Node, *Tree;  
  
Status create_tree(Tree *T){  
    char ch = getchar();  
    if(ch == ',') (*T)=NULL;  
    else{  
        (*T) = (Tree)malloc(sizeof(Node));  
        if(!(*T)) return 0;  
        (*T)->data = ch;  
        create_tree(&(*T)->lchild);  
        create_tree(&(*T)->rchild);  
    }  
    return 1;  
}  
  
void print_in(Tree T){  
    if(T){  
        print_in(T->lchild);  
        putchar(T->data);  
        print_in(T->rchild);  
    }  
}  
  
void print_la(Tree T){  
    if(T){  
        print_la(T->lchild);  
        print_la(T->rchild);  
        putchar(T->data);  
    }  
}  
  
int cnt_depth(Tree T){  
    if(!T) return 0;  
    int a, b;  
    a = cnt_depth(T->lchild);  
    b = cnt_depth(T->rchild);  
    if(a>b) return a+1;  
    else return b+1;  
}  
  
int cnt_leaf(Tree T){  
    if(!T->lchild && !T->rchild) return 1;  
    else{  
        if(!T->lchild) return cnt_leaf(T->rchild);  
        if(!T->rchild) return cnt_leaf(T->lchild);  
        else return cnt_leaf(T->lchild)+cnt_leaf(T->rchild);  
    }  
}  
  
int main(){  
    Tree T;  
    create_tree(&T);  
    print_in(T);  
    putchar('\n');  
    print_la(T);  
    putchar('\n');  
  
    printf("%d\n", cnt_leaf(T));  
    printf("%d\n", cnt_depth(T));  
  
    return 0;  
}  

数据结构实验之求二叉树后序遍历和层次遍历

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#define MAXN 200  
  
typedef int ElemType;  
typedef int Status;  
  
typedef struct Node{  
    ElemType data;  
    struct Node *lchild, *rchild;  
}Node, *Tree;  
  
Tree q[MAXN];  
  
void build(Tree *T, char *s1, char *s2, int len){  
    if(len <= 0) {(*T) = NULL; return ;}  
    (*T) = (Tree)malloc(sizeof(Node));  
    int p = strchr(s2, s1[0]) - s2;  
    (*T)->data = s1[0];  
    build(&(*T)->lchild, s1+1, s2, p);  
    build(&(*T)->rchild, s1+p+1, s2+p+1, len-p-1);  
}  
  
void print_la(Tree T){  
    if(T){  
        print_la(T->lchild);  
        print_la(T->rchild);  
        putchar(T->data);  
    }  
}  
  
void BFS(Tree T){  
    int front, rear;  
    Tree bt;  
    front = rear = 0;  
    if(T) q[rear++] = T;  
    while(front<rear){  
        bt = q[front++];  
        putchar(bt->data);  
        if(bt->lchild) q[rear++] = bt->lchild;  
        if(bt->rchild) q[rear++] = bt->rchild;  
    }  
}  
  
int main(){  
    Tree T;  
    int t;  
    char s1[MAXN], s2[MAXN];  
    scanf("%d", &t);  
    while(t--){  
        scanf("%s %s", s1, s2);  
        int len = strlen(s1);  
        build(&T, s1, s2, len);  
        print_la(T);  
        putchar('\n');  
        BFS(T);  
        putchar('\n');  
    }  
    return 0;  
}