what is dijkstra shortest path algorithm

Do not write the Normal template, or need priority queue optimization of the Ang1#include //basic need for header files2#include string.h>3#include 4#include 5#include 6 using namespacestd;7typedef pairint,int>PII;8 Const intinf=0x3f3f3f3f;9 Ten One structcmp{//Change priority queue to small Gan A BOOL operator() (PII a,pii b) { - returnA.first>B.first; - } the }; - - voidDij (intSintT) {//incoming starting point and arrival point - inti; +Priority_queueQ; -Q.push (Make_pai

1. #include 2.#include Dijkstra Single Source Shortest path

http://acm.split.hdu.edu.cn/showproblem.php?pid=3790 Open structure Save distance (len) and cost two variables, in the Dijkstra to find the shortest-circuit update D[y] = min{d[y], D[x] + w (x, y)}; , there are two kinds of situations: ①d[y].len > D[x].len + len (x, y); ②d[y].len = = D[x].len + len (x, y); The rest is the same. Note the assignment of the initial

; } } }}intMain () {intM,n,a,b,c; //The number in the input file means: 1-8 is base, 9-43 is point of sale, 44-58 is intersection, format is point distanceFreopen ("In.txt","R", stdin);//read data from a fileFreopen ("OUT.txt","W", stdout);//output results to file voidDIJKSTR (intXin

Shortest path problem time limit: 2000/1000 MS (Java/others) memory limit: 32768/32768 K (Java/Others) Total submission (s): 13336 accepted submission (s): 4072 Problem description gives you n vertices, M undirected edges, and each edge has a length of D and a cost of P, giving you the starting point S endpoint t, it is required to output the

to the party (3 units) and returns via farms 1 and 3 (7 units), for a total of ten time units.1 /*2 The key is to reverse the storage, to find the shortest-circuiting thinking transformation3 */4#include 5#include string.h>6#include 7 using namespacestd;8 voidDijkstra (intSinte[][1010]);9 #defineINF 99999999Ten intdis[1010],book[1010],e[1010][1010],f[1010][1010],d[1010],n,m; One intMain () A { - inti,j

other path).InputLine 1:two space-separated integers:NandR Lines 2..R+1:each line contains three space-separated integers:A,B, andDThat's describe a road that connects intersectionsAandBand has lengthD(1≤D≤5000)OutputLine 1:the length of the second shortest path between node 1 and nodeNSample Input4 41 2 1002 4 2002 3 2503 4 100Sample Output450Hint3 (length 100+

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=1874Unblocked Works continuedTime limit:3000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 36359 Accepted Submission (s): 13355Problem description a province since the implementation of many years of smooth engineering plans, finally built a lot of roads. But the road is not good, every time from one town to another town, there are many ways to choose, and som

Freddy's and Fiona's stone. InputThe input will contain in one or more test cases. the first line of each test case will contain the number of stones N (2 OutputFor each test case, print a line saying "Scenario # X" and a line saying "frog distance = y" where X is replaced by the test case number (they are numbered from 1) and y is replaced by the appropriate real number, printed to three decimals. put a b

Reprinted from: http://blog.csdn.net/fengchaokobe/article/details/7478774 The problem of the first section and the solution method The so-called shortest path problem can be said to be described in two different situations. Description One: In graph theory, refers to finding the shortest distance between two nodes in a graph. Figure below Description Two: In re

The short path is a pure template question. It is necessary to explain it for the first time. I wonder if you have found this dijela.AlgorithmIt is surprisingly similar to the prim algorithm of the minimal spanning tree (well, it is