An addition chain for n is an integer sequence <a0, a1,a2,...,am=""> with the following four properties: a0 = 1 am = n a0 < a1 < a2 < ... < am-1 < am For each k (1<=k<=m) there exist two (not necessarily different) int…

Q - 迷宫问题 POJ - 3984 定义一个二维数组: int maze[5][5] = { 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, }; 它表示一个迷宫,其中的1表示墙壁,0表示可以走的路,只能横着走或竖着走,不能斜着走,要求编程序找出从左上角到右下角的最短路线. Input 一个5 × 5的二维数组,表示一个迷宫.数据保证有唯一解. Output 左上角到右下角的最短路径,格式如…

题意:给你一个迷宫. 先输出当左转优先的时候走的路程长度,再输出当右转优先时走的路程长度,最后输出从起点到终点的最短路程长度. 嗯嗯 奴哥活跃气氛的题.随便写了写.. 此题 知道了思路以后就是水题了.... 再随便缩缩行也就不到40行 (网上的题解好多200+的..) 发现pair是个很坑的角儿.我一不小心就写挂了,重点是本机测试所有数据的输出结果都对.查不出来哪儿错的,,找了5min才找出来. 把 pair < int,int> *p=&q.front();然后就p->firs…

注意求最短路的时候用Bfs. #include<iostream> #include<stdio.h> using namespace std; int w,h,ex,ey,sx,sy; int map[100][100],can[100][100]; struct vid{ int x,y,step; }queue[5000]; int zan[4][2]={{-1,0},{0,1},{1,0},{0,-1}}; int dirl[4][2]={0,-1,-1,0,0,1,1,0…

题目: 输入正整数n(1≤n≤1000),问最少需要几次乘除法可以从x得到xn ?在计算过程中x的指数应当总是正整数. 思路: dfs枚举次数深搜 注意: 1.指数如果小于0,就退出当前的搜索 2.now<<(MX-cur)<n即当前指数now乘以2^(MX-cur)还是小于n的话,就剪枝,因为乘以2^(MX-cur)得到的数是当前步数得到的最大的数. 代码: #include <bits/stdc++.h> #define inf 0x3f3f3f3f #define MA…

题目链接:http://bailian.openjudge.cn/practice/2248 题解: 迭代加深DFS. DFS思路:从目前 $x[1 \sim p]$ 中选取两个,作为一个新的值尝试放入 $x[p+1]$. 迭代加深思路:设定一个深度限制,一旦到达这个界限,即继续往下搜索:该深度限制从 $1$ 开始,每次自加 $1$.这么做的好处是,正好也符合题目要求的最短的数组长度. AC代码: #include<bits/stdc++.h> using namespace std; ];…

[题目描述] An addition chain for n is an integer sequence with the following four properties: a0 = 1 am = n a0 < a1 < a2 < ... < am-1 < am For each k (1<=k<=m) there exist two (not necessarily different) integers i and j (0<=i, j<=k…

Addition Chains Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 5454   Accepted: 2923   Special Judge Description An addition chain for n is an integer sequence <a0, a1,a2,...,am="">with the following four properties: a0 = 1 a…

Description An addition chain for n is an integer sequence  with the following four properties: a0 = 1 am = n a0<a1<a2<...<am-1<am For each k ( ) there exist two (not neccessarily different) integers i and j ( ) with ak =ai +aj You are give…

Description An addition chain for n is an integer sequence with the following four properties: a0 = 1 am = n a0 < a1 < a2 < ... < am-1 < am For each k (1<=k<=m) there exist two (not necessarily different) integers i and j (0<=i, j&…