bfs warranty

direction is where, to divide the odd lines and even lines to discuss, If it is an odd line, then he can and (X,y-1), (x,y+1), (x-1,y-1), (X-1,y), (x+1,y-1), (x+1,y) connected, if it is an even line, it can and (x,y-1), (x,y+1), (x+1,y+1), (x+1,y ), (x-1,y+1), (x-1,y) connected, first from the initial position to do a BFS, all the same color and connected ball marker count, and then start from the first row to do a second

Links: http://www.lydsy.com/JudgeOnline/problem.php?id=1098Analysis: see note.1 //complement graph connected block BFS + chain list optimization2#include 3#include 4#include 5#include 6 using namespacestd;7 8 structEdge {9 intto, NXT;Ten }; One A structNode { - intPre, NXT; - }; the - Const intMAXM =2000000+5; - Const intMAXN =100000+5; - + intN, M, CNT; - intHEAD[MAXN], VIS[MAXN], VI[MAXN]; +Edge E[MAXM 1]; A Node L[MAXN]; atvectorint>ans;

Title Link: BZOJ-1098Problem analysisOnly when there are edges between the two points can they be in different buildings, that is, if there is no edge between the two points they must be in the same building.Then the request is to find the original map of the connected block.However, the number of sides of the original map is n^2 level, very large, we can not directly find the complement map.You can use a linked list to optimize the BFS approach, star

Title Description Description Inside the maze of N*n, "#" is the Wall, "." For the road, "s" for the beginning, "E" for the end, altogether 4 directions can walk. From the upper left corner ((0,0) "s" position to the lower right corner ((n-1,n-1) "E") position, you can walk the general output Yes, can not go output no.Enter a description input Description The first behavior of the input is an integer m, which indicates the number of mazes.The first behavior of each maze data followed by an integ

]==0, first BFS once, the leading 0 is removed. BFs got Wx,wy.2, then is to find the smallest path. A walking count for (int i=wx+wy;i1#include 2#include 3#include 4#include 5#include 6 using namespacestd;7 #defineN 10068 intn,m;9 intMp[n][n];Ten intVis[n][n]; One structnode{ A intx, y; - }st; - intdirx[]={1,0,-1,0}; the intdiry[]={0,1,0,-1}; - intWx,wy; - voidBFs () { -QueueQ; + Q.push (ST); - Node t1,

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=1242Test instructions: "R" is the starting point, "a" is the end point, '. ' Is the road, ' X ' is the Guard, ' # ' is not the place to go. Kill the guard to spend more than 1 units of time, each move up or down to spend a unit of time. Ask for the least amount of time to finish.Idea: This n*m map and take the right (one is 1, one is 2) of the general use of bfs+ priority queue, if not with the rig

http://hihocoder.com/problemset/problem/1139This tip is written in two points, but it should also be felt, at least the topic is AC ...Two points of thought is the value of the two-point answer, see can be in the K-step, get this answer value, can use BFS to determine.Not two points, is the need for a dis[] array to save in the first k step, each point of the minimum value of the enemy, because the BFS in t

For a year Acmer even now learn BFS ...All right, BFS, the first question.Naked naked questions.　　　　1#include 2#include 3#include 4 using namespacestd;5 inta[Ten][Ten];6 structnode7 {8 intx, y;9} que[ -];Ten intpre[ -],vis[Ten][Ten]; One intBFS () A { - - intL =0, r =1; thememset (Vis,0,sizeof(Vis)); -que[0].x =1; que[0].Y =1; -vis[0][0] =1;p re[0] = -1; - while(lR) + { - intx = Qu

Topic Portal1 /*2 bfs+ Simulation: dp[i][j][p] means to go to i,j, the direction of the number of steps of P;3 BFS in 4 different situations, and finally in the end 4 direction to find the minimum value:)4 */5#include 6#include 7#include 8#include 9#include string>Ten#include One using namespacestd; A - Const intMAXN = 1e2 +Ten; - Const intINF =0x3f3f3f3f; the intdir[4][4][2] = { -{{0, -1}, {0,1}, {-1,0},

"BFS" hdu 1104 remainderTitle Link: Hdu 1104 remainderVery good search topic, but there are a few key issues to be aware of. Shortest path, decisive bfs+queue Path storage problem, only wanted to store the results of each step in the queue (int) Q, and later found that the path can not be recorded, select the way to store nodes and string to save the path, queue (node) q, open a temporary node

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=1429, the first write-like pressure, feeling can also.　　The idea of state representation is actually to represent the situation of each layer with a numeric value, while state compression simplifies this representation using bitwise operations. ExercisesIn the current state to add a key value, indicating that the number of keys taken now, the key value is actually a binary representation, 001 to get a key, 1011 to get a, B, d these thre

The positive solution is Tarjan, I did not writeWith two BFs, the first BFS is done on the back of the original image, starting with N and finding all the points that can be reached from N.The second BFS starts from the starting point, saving the minimum value mp[i] on each point to the N-point path.Finally, the maximum value of w[i]-mp[i] can be calculated by tr

Test Instructions:Link * * Method: **bfs+ Shortest circuitparsing:This problem is still very interesting. The first idea gets stuck, the first one is two cents +bfs, but if so, what can be done? To a point of traffic. So you have to change your mind. You may want to redefine the shortest path. Consider all 0 of the points in the diagram as feasible, and each time you search from that point to 0 points, and

clockwise rotation of a lattice, such as can be transformed to 17245368Give you the original state of the magic plate and the target State, please give a minimum number of transformation steps from the initial state to the head, if there are many transformation schemes to take the smallest dictionary order.The test data of input contains two lines, representing the initial state and the state of the magic Plate respectively.Output satisfies the test instructions transformation step for each set

Topic Portal1 /*2 BFS: three-dimensional BFS, plus direction. Use Dp[x][y][d] to record the minimum number of turns currently required3 */4#include 5#include 6#include 7#include 8#include 9 using namespacestd;Ten One Const intMAXN = 1e2 +Ten; A Const intINF =0x3f3f3f3f; - structP - { the intx, y, Z; - }now, to; - CharMAZE[MAXN][MAXN]; - intdp[maxn][maxn][4]; + BOOLinq[maxn][maxn][4]; - intdx[4] = {-1,1

lines describing the map. Assume both N and M are between 2 and inclusive. There would be the same number of ' H ' s and ' M's on the map; And there'll is at the most houses. Input would terminate with 0 0 for N and M.Output:For each test case, the output one line with the single integer, which are the minimum amount, in dollars, and you need to pay.Sample Input:2 2.mh.5 5HH.. m...............mm. H7 8...H ..... H....... H....mmmhmmmm ... H....... H....... H.... 0 0Sample Output:21028Test instru

The first topic of winter vacation, in the holiday home decadent two days later, today finally began to brush the question. I hope I can brush a few more questions every day.Test instructions: This BFS problem is still a little complicated, to a maximum of 9*9 maze, but each point has a different direction, each entry into the direction of the point is different, allowed to go out of the direction is different. So in the record maze when the trouble,

Links: http://acm.hdu.edu.cn/showproblem.php?pid=1728Previously did not do similar to the minimum number of corners of the topic, the general demand for the least use BFS should be better. But before BFS is generally used to find the minimum number of steps, you can mark the past points no longer go. Now the subject is the smallest number of turns, so it is not possible to mark the passing point. An array i

There are some ignition points in the labyrinth of the test instructions N*m, and the next second of the adjacent non-wall points of each ignition point will be a fire point. Joe can move one step at a time to an adjacent point to give you the location of all the ignition points and Joe's position. Ask Joe the minimum amountYou can save the first ignition time of each point by the BFS first. Only Joe arrives at that point for less than this time Joe c

Poj3278 getting started with BFS and getting started with poj3278bfsM-Search Crawling in process... Crawling failed Time Limit:2000 MSMemory Limit:65536KB64bit IO Format:% I64d % I64uSubmit Status Practice POJ 3278 Description Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a pointN(0 ≤N≤ 100,000) on a number line and the cow is at a pointK(0 ≤K≤ 100,000) on the same number line. Farmer