"shotest path of graph hackezarth tutorial" Code Answer's
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shotest path of graph hackezarth tutorial
#define SIZE 100000 + 1
vector < pair < int , int > > v [SIZE]; // each vertex has all the connected vertices with the edges weights
int dist [SIZE];
bool vis [SIZE];
void dijkstra(){
// set the vertices distances as infinity
memset(vis, false , sizeof vis); // set all vertex as unvisited
dist[1] = 0;
multiset < pair < int , int > > s; // multiset do the job as a min-priority queue
s.insert({0 , 1}); // insert the source node with distance = 0
while(!s.empty()){
pair <int , int> p = *s.begin(); // pop the vertex with the minimum distance
s.erase(s.begin());
int x = p.s; int wei = p.f;
if( vis[x] ) continue; // check if the popped vertex is visited before
vis[x] = true;
for(int i = 0; i < v[x].size(); i++){
int e = v[x][i].f; int w = v[x][i].s;
if(dist[x] + w < dist[e] ){ // check if the next vertex distance could be minimized
dist[e] = dist[x] + w;
s.insert({dist[e], e} ); // insert the next vertex with the updated distance
}
}
}
}
Source: www.hackerearth.com
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