The difference between queue and pointer for the shortest Circuit

Source: Internet
Author: User

Take spfa as an example; // save edges in the adjacent table;

Pointer:

Int H = 1, t = 1; Q [H] = x; while (H <= T) {int u = Q [H]; vis [u] = 0; for (INT I = head [u]; I! =-1; I = E [I]. next) {int v = E [I]. to; If (Dist [v]> Dist [u] + E [I]. w) {Dist [v] = DIST [u] + E [I]. w; If (! Vis [v]) {vis [v] = 1; Q [++ T] = V ;}} H ++ ;}

Queue

Void spfa (int x) {queue <int> q; q. Push (x); memset (VIS, true, sizeof (VIS); While (! Q. Empty () {int u = Q. Front (); q. Pop; vis [u] = 0; For (INT I = head [u]; I! =-1; I = E [I]. next) {int v = E [I]. to; If (Dist [v]> Dist [u] + E [I]. w) {Dist [v] = DIST [u] + E [I]. w; If (! Vis [v]) {vis [v] = 1; q. Push (v );}}}}}

In fact, this is just the difference between the team and the team;

The difference between queue and pointer for the shortest Circuit

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