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@ -10,61 +10,67 @@ import { printTree } from '../modules/PrintUtil';
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/* 判断当前状态是否为解 */
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function isSolution(state: TreeNode[]): boolean {
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return state && state[state.length - 1]?.val === 7;
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return state && state[state.length - 1]?.val === 7;
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}
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/* 记录解 */
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function recordSolution(state: TreeNode[], res: TreeNode[][]): void {
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res.push([...state]);
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res.push([...state]);
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}
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/* 判断在当前状态下,该选择是否合法 */
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function isValid(state: TreeNode[], choice: TreeNode): boolean {
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return choice !== null && choice.val !== 3;
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return choice !== null && choice.val !== 3;
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}
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/* 更新状态 */
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function makeChoice(state: TreeNode[], choice: TreeNode): void {
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state.push(choice);
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state.push(choice);
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}
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/* 恢复状态 */
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function undoChoice(state: TreeNode[]): void {
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state.pop();
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state.pop();
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}
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/* 回溯算法:例题三 */
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function backtrack(state: TreeNode[], choices: TreeNode[], res: TreeNode[][]): void {
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// 检查是否为解
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if (isSolution(state)) {
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// 记录解
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recordSolution(state, res);
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return;
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}
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// 遍历所有选择
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for (const choice of choices) {
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// 剪枝:检查选择是否合法
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if (isValid(state, choice)) {
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// 尝试:做出选择,更新状态
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makeChoice(state, choice);
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// 进行下一轮选择
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backtrack(state, [choice.left, choice.right], res);
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// 回退:撤销选择,恢复到之前的状态
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undoChoice(state);
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function backtrack(
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state: TreeNode[],
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choices: TreeNode[],
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res: TreeNode[][]
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): void {
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// 检查是否为解
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if (isSolution(state)) {
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// 记录解
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recordSolution(state, res);
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return;
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}
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// 遍历所有选择
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for (const choice of choices) {
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// 剪枝:检查选择是否合法
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if (isValid(state, choice)) {
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// 尝试:做出选择,更新状态
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makeChoice(state, choice);
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// 进行下一轮选择
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backtrack(state, [choice.left, choice.right], res);
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// 回退:撤销选择,恢复到之前的状态
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undoChoice(state);
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}
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}
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}
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}
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// Driver Code
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const root = arrToTree([1, 7, 3, 4, 5, 6, 7]);
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console.log("\n初始化二叉树");
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console.log('\n初始化二叉树');
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printTree(root);
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// 回溯算法
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const res: TreeNode[][] = [];
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backtrack([], [root], res);
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console.log("\n输出所有根节点到节点 7 的路径,要求路径中不包含值为 3 的节点");
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res.forEach(path => {
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console.log(path.map(node => node.val));
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console.log('\n输出所有根节点到节点 7 的路径,要求路径中不包含值为 3 的节点');
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res.forEach((path) => {
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console.log(path.map((node) => node.val));
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});
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export {};
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