题目
You are given a list of non-negative integers, a1, a2, …, an, and a target, S. Now you have 2 symbols and -. For each integer, you should choose one from and - as its new symbol. Find out how many ways to assign symbols to make sum of integers eq…
Write an algorithm to print all ways of arranging eight queens on a chess board so that none of them share the same row, column or diagonal. 经典的八皇后问题: 在一个8*8的棋盘上放8个皇后,使得这8个皇后无法互相攻击( 任意2个皇后不能处于同…
最近写代码碰到了一个bug,就是递归次数太多爆堆栈了,然后就写了一个递归工具来解决这个问题。
using System;
using System.Collections.Generic;/// <summary>
/// 递归工具
/// </summary>
public static class RecursionTool
{//递归方式…
汉诺塔 --java实现-递归的应用场景
***一切解释尽在代码中,尽情享受吧
public class TestHanoi {public static void main(String[] args) {System.out.println("A B C");System.out.println("汉诺塔的移动顺序:");h…
递归为什么这么难?一篇文章带你了解递归
美国计算机科学家——彼得多伊奇(L Peter Deutsch)在《程序员修炼之道》(The Pragmatic Programmer)一书中提到“To Iterate is Human, to Recurse, Divine”——我理解的这句话为:人理解迭代,神理解…
题目
Given an array of scores that are non-negative integers. Player 1 picks one of the numbers from either end of the array followed by the player 2 and then player 1 and so on. Each time a player picks a number, that number will not be available for the…
Given a digit string excluded 01, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below.
样例 给定 “23” 返回 [“ad”, “ae”, “af”, “bd”, “be”,…
今天主要分享三道题 Container With Most Water 题意:给一系列的高度为hih_ihi的木板,彼此之间的距离为1个单位长度。问任选两个木板组成的容器面积最大是多少?解法1:暴力,遍历所有组合,时间负责度是O(n2…
#题目 In LeetCode Store, there are some kinds of items to sell. Each item has a price.
However, there are some special offers, and a special offer consists of one or more different kinds of items with a sale price.
You are given the each item’s price, a…
// 递归实现满二叉树的节点个数
int add(int n, int a) {int r pow(2, a-1) n;a--;if (a 0) {return r;}add(r, a);
}void main()
{cout << add(0, 4) << endl; // 15
}
递归的满足条件:
子问题须与原始问题为同样的事,且更为简单&…
python 中使用递归画出一棵树的源代码,大家可以参考画出一片森林,源代码如下:
# drawTree.py
import turtle as pdef maketree(x,y):# p Turtle()p.color("green")p.pensize(5)#p.setundobuffer(None)p.hideturtle()#Make the tu…
1、生成 1 ~ n 的排列
思路
尝试用递归的思想解决:先输出所有以 1 开头的排列(这步是递归调用),然后输出以 2 开头的排列(又是递归调用),接着是以 3 开头的排列… 最后才是以 n n n 开头的排…
废话不多说,我们先看一下位置排序的算法: #include <iostream>
using namespace std;int n 0;int m 2;int l 0;int a[100];void solve(int l);int main()
{cout<<"请输入位数 n "<<endl;cin>>n;solve(l);return 0;…
若列表内包含重复出现的元素,则应只保留一个副本,且保持原列表元素的顺序。如
sash> (compress (a a a a b c c a a d e e e e))
sash> (a b c a d e)
问题分析
使用递归解决问题的好处在于能全局分析问题,从“局部“解决一个全局的…
参考
how to get name of all file in a directory and sub-directory in java - Stack Overflowhttps://stackoverflow.com/questions/8788976/how-to-get-name-of-all-file-in-a-directory-and-sub-directory-in-java
pom导入依赖
<dependency><groupId>commo…
代码很短,实现起来也很简单,下面是代码: //
// main.cpp
// PreMidgetPost
//
// Created by xin wang on 4/29/15.
// Copyright (c) 2015 xin wang. All rights reserved.
//#include <iostream>//链表二叉树的节点类
template &…
文件名为:build.sh #!/bin/bashecho "###################################################################"
echo "# Preparing to Recursively modify files in the folder"
echo "#################################################…
Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example, Given: s1 "aabcc", s2 "dbbca", When s3 "aadbbcbcac", return true. When s3 "aadbbbaccc", return false. 这道题需要判断两个字…
Linux 系统的常用操作命令
文件列表、所有权和访问权 ls
列出文件清单的命令 -l 列出文件详细信息l(list) -a 列出当前目录下所有文件及目录,包括隐藏的a(all) -d 将目录像文件一样显示 而不显示其目录下的文件 Chown
改变文件所有权限的命令。
该命令就是把文件…
问题描述
如果列表内包含有重复的元素且连续,则应当将它们放入单独的子列表内,如:
sash> (pack (a a a a b c c a a d e e e e))
sash> ((a a a a) (b) (c c) (a a) (d) (e e e e))
解法
(define pack(lambda (ls)(if (null? ls)…
递归
概述
定义
计算机科学中,递归是一种解决计算问题的方法,其中解决方案取决于同一类问题的更小子集 In computer science, recursion is a method of solving a computational problem where the solution depends on solutions to smaller instan…
问题:在一个N*N的棋盘上摆放N个“皇后”,且两两不在同一直线和斜线上,求有多少种摆法
解法:使用递归和回溯的思想求解
代码:
#include <iostream>
using namespace std;
const int N 8;// N皇后问题
int map…
题目描述 现在有一个仅包含‘X’和‘O’的二维板,请捕获所有的被‘X’包围的区域 捕获一个被包围区域的方法是将被包围区域中的所有‘O’变成‘X’ 例如 X X X X X O O X X X O X X O X X 执行完你给出的函数以后,这个二维板应该变成: X X X …
快排非递归: #include <stdio.h>
#include <stdlib.h>int partition(int s[], int i, int j)
{int value 0;int flag 1; //判断该从头循环还是尾循环value s[i];while(i<j){switch(flag){case 0:if(s[i] < value)i;else{s[j--] s[i];flag 1;…
文章目录 5.2.1 二叉树二叉树性质引理5.1:二叉树中层数为i的结点至多有 2 i 2^i 2i个,其中 i ≥ 0 i \geq 0 i≥0。引理5.2:高度为k的二叉树中至多有 2 k 1 − 1 2^{k1}-1 2k1−1个结点,其中 k ≥ 0 k \geq 0 k≥0。引理5.3&…
问题描述
Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, add spaces in s to construct a sentence where each word is a valid dictionary word. You may assume the dictionary does not contain duplicate words.
Return…
一般我们求解阶乘用的时迭代的方法,即使用循环语句来实现功能,这次我们用的是递归的方法: long int Factral( long int N ){if( N > 1 ){return N * Factral( N - 1 );}else{return 1;}
}
原文地址为:
Java递归算法的小例子 求123...1000 和public class Test1 {
int sum0;
int a1;
public void sum()
{suma;a;if(a<1000){sum();//调用自身实现递归}
}
public static void main(String[] args) {Test1 testnew Test1();test.sum();System.out.printl…
1.全球变暖 - 蓝桥云课 (lanqiao.cn) import os import sys # 请在此输入您的代码 sys.setrecursionlimit(60000) n int(input()) dao [] for _ in range(n): tmp list(input()) dao.append(tmp) dict [(1, 0), (0, 1), (-1, 0), (0, -1)] used [[0 for _ in range(n)] fo…
A题:
A题题目链接
题目描述: Fibonacci-ish TimeLimit:3000MS MemoryLimit:512MB64-bit integer IO format:%I64dProblem DescriptionYash has recently learnt about the Fibonacci sequence and is very excited about it. He calls a sequence Fi…
文章目录 5.2.1 二叉树二叉树性质引理5.1:二叉树中层数为i的结点至多有 2 i 2^i 2i个,其中 i ≥ 0 i \geq 0 i≥0。引理5.2:高度为k的二叉树中至多有 2 k 1 − 1 2^{k1}-1 2k1−1个结点,其中 k ≥ 0 k \geq 0 k≥0。引理5.3&…
public class Solution {// 子环节,归并两个有序的数组public void MergeSort(int[] arr, int left, int mid, int right){int[] arr2 new int[mid - left 1];int[] arr3 new int[right - mid];int length1 mid - left 1;int length2 right - mid;for(int i …
leetcode题目链接 17 216 216.组合总和III
class Solution {List<Integer> path new ArrayList();List<List<Integer>> result new ArrayList();public List<List<Integer>> combinationSum3(int k, int n) {backTrace(k,n,1,0);return resu…
2.危险系数 - 蓝桥云课 (lanqiao.cn) n, m map(int, input().split())
map_ [[] for i in range(n 1)]
used [0 for i in range(n 1)]
used_ [0 for i in range(n 1)]
cnt 0
res []
for _ in range(m):u, v map(int, input().split())map_[u].append(v)map_[v].appen…