目录

2014年统考

2017年统考

2022年统考

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2014年统考

#include <iostream>
#include <stack>
#include <queue>
typedef struct treenode{int weight;struct treenode *left;struct treenode *right;
}treenode,*ptreenode;ptreenode buytreenode(int x)
{ptreenode n=(ptreenode) malloc(sizeof (treenode));n->weight=x;n->left= nullptr,n->right= nullptr;return n;
}
ptreenode build_tree1()
{ptreenode root= buytreenode(1);root->left= buytreenode(2);root->right= buytreenode(3);root->left->left= buytreenode(4);root->left->right= buytreenode(5);root->right->left= buytreenode(6);root->right->right= buytreenode(7);root->left->left->left= buytreenode(8);root->left->left->right= buytreenode(9);return root;
}void print_tree(ptreenode root) {std::queue<ptreenode> tmp;tmp.push(root);int s = tmp.size();while (!tmp.empty()) {ptreenode t = tmp.front();tmp.pop();s--;printf("%3d", t->weight);if (t->left) tmp.push(t->left);if (t->right) tmp.push(t->right);if (s == 0) puts(""), s = tmp.size();}
}int _wpl(ptreenode root,int depth)
{if(root== nullptr) return 0;if(!root->left&&!root->right) return root->weight *depth;return _wpl(root->left,depth+1)+ _wpl(root->right,depth+1);
}
int _wpl2(ptreenode root)
{if(root== nullptr) return 0;if(!root->left&&!root->right) return 0;int w_l,w_r;w_l= _wpl2(root->left);w_r= _wpl2(root->right);root->weight=root->left->weight+root->right->weight;return w_l+w_r+root->weight;}
int wpl(ptreenode root)
{return _wpl(root,0);
}
int wpl2(ptreenode root)
{return _wpl2(root);
}
int main() {ptreenode root1=build_tree1();print_tree(root1);printf("the answer should be:%3d\n",8*3+9*3+5*2+6*2+7*2);//方法1printf("%3d\n",wpl(root1));//方法2printf("%3d\n",wpl2(root1));return 0;
}

2017年统考

#include <iostream>
#include <stack>
#include <queue>
#include <string>typedef struct treenode {std::string data;struct treenode *left;struct treenode *right;
} treenode, *ptreenode;ptreenode buytreenode(std::string x) {ptreenode n = new treenode; // 使用 new 来动态分配内存n->data = x;n->left = nullptr;n->right = nullptr;return n;
}ptreenode build_tree1()
{ptreenode root= buytreenode("*");root->left= buytreenode("+");root->right= buytreenode("*");root->left->left= buytreenode("a");root->left->right= buytreenode("b");root->right->left= buytreenode("c");root->right->right= buytreenode("-");root->right->right->right= buytreenode("d");return root;
}ptreenode build_tree2()
{ptreenode root= buytreenode("+");root->left= buytreenode("*");root->right= buytreenode("-");root->left->left= buytreenode("a");root->left->right= buytreenode("b");root->right->right= buytreenode("-");root->right->right->left= buytreenode("c");root->right->right->right= buytreenode("d");return root;
}void print_tree(ptreenode root) {std::queue<ptreenode> tmp;tmp.push(root);int s = tmp.size();while (!tmp.empty()) {ptreenode t = tmp.front();tmp.pop();s--;printf("%3s", t->data.c_str());if (t->left) tmp.push(t->left);if (t->right) tmp.push(t->right);if (s == 0) puts(""), s = tmp.size();}
}std::string trans(ptreenode root,int depth)
{if(root== nullptr) return "";if(!root->left&&!root->right) return root->data;if(depth==0){return trans(root->left,depth+1)+root->data+ trans(root->right,depth+1);}return "("+ trans(root->left,depth+1)+root->data+ trans(root->right,depth+1)+")";}
int main() {ptreenode root1=build_tree1();print_tree(root1);printf("%s\n",trans(root1,0).c_str());ptreenode root2=build_tree2();print_tree(root2);printf("%s\n",trans(root2,0).c_str());return 0;
}

2022年统考

#include <iostream>
#define MAX_SIZE 20
typedef struct{int SqBiTNode[MAX_SIZE];int ElemNum;//实际占用的数组元素个数
}SqBiTree;bool search_tree(SqBiTree tree,int pos)
{if (pos>tree.ElemNum||tree.SqBiTNode[pos]==-1) return true;if(pos*2+1<tree.ElemNum&&(pos*2+2)<tree.ElemNum&&tree.SqBiTNode[pos*2+1]!=-1&&tree.SqBiTNode[pos*2+2]!=-1){bool tmp=(tree.SqBiTNode[pos]>=tree.SqBiTNode[pos*2+1])&&(tree.SqBiTNode[pos]<=tree.SqBiTNode[pos*2+2]);return search_tree(tree,pos*2+1)&& search_tree(tree,pos*2+2)&&tmp;}if(pos*2+1<tree.ElemNum&&tree.SqBiTNode[pos*2+1]!=-1) return tree.SqBiTNode[pos]>=tree.SqBiTNode[pos*2+1]&& search_tree(tree,pos*2+1);if(pos*2+2<tree.ElemNum&&tree.SqBiTNode[pos*2+2]!=-1) return tree.SqBiTNode[pos]<=tree.SqBiTNode[pos*2+2]&& search_tree(tree,pos*2+2);}bool search_tree2(SqBiTree tree,int pos,int &pre)
{if (pos<tree.ElemNum&&tree.SqBiTNode[pos]!=-1) {if (!search_tree2(tree, 2 * pos + 1, pre)) return false;if (tree.SqBiTNode[pos] <= pre) return false;pre = tree.SqBiTNode[pos];if (!search_tree2(tree, 2 * pos + 2, pre)) return false;}return true;
}
int main() {SqBiTree t1;int values[] = {40, 25, 60, -1, 30, -1, 80, -1, -1, 27};std::copy(values, values + sizeof(values) / sizeof(values[0]), t1.SqBiTNode);t1.ElemNum=10;// 打印数组for (int i = 0; i < t1.ElemNum; ++i) {std::cout << t1.SqBiTNode[i] << " ";}std::cout << std::endl;SqBiTree t2;int values2[] = {40,50,60,-1,30,-1,-1,-1,-1,-1,35};std::copy(values2, values + sizeof(values2) / sizeof(values2[0]), t2.SqBiTNode);t2.ElemNum=11;// 打印数组for (int i = 0; i < t2.ElemNum; ++i) {std::cout << t2.SqBiTNode[i] << " ";}std::cout << std::endl;if(search_tree(t1,0)) printf("tree1 is a search tree\n");else printf("tree1 is not a search tree\n");if(search_tree(t2,0)) printf("tree2 is a search tree\n");else printf("tree2 is not a search tree\n");int pre=-1;if(search_tree2(t1,0,pre)) printf("tree1 is a search tree\n");else printf("tree1 is not a search tree\n");pre=-1;if(search_tree2(t2,0,pre)) printf("tree2 is a search tree\n");else printf("tree2 is not a search tree\n");return 0;
}