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“kruskal's algorithm c++ hackerearth” Code Answer
kruskal's algorithm c++ hackerearth
cpp by
Stormy Skylark
on Jul 01 2020
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#include <iostream> #include <vector> #include <utility> #include <algorithm> using namespace std; const int MAX = 1e4 + 5; int id[MAX], nodes, edges; pair <long long, pair<int, int> > p[MAX]; void initialize() { for(int i = 0;i < MAX;++i) id[i] = i; } int root(int x) { while(id[x] != x) { id[x] = id[id[x]]; x = id[x]; } return x; } void union1(int x, int y) { int p = root(x); int q = root(y); id[p] = id[q]; } long long kruskal(pair<long long, pair<int, int> > p[]) { int x, y; long long cost, minimumCost = 0; for(int i = 0;i < edges;++i) { // Selecting edges one by one in increasing order from the beginning x = p[i].second.first; y = p[i].second.second; cost = p[i].first; // Check if the selected edge is creating a cycle or not if(root(x) != root(y)) { minimumCost += cost; union1(x, y); } } return minimumCost; } int main() { int x, y; long long weight, cost, minimumCost; initialize(); cin >> nodes >> edges; for(int i = 0;i < edges;++i) { cin >> x >> y >> weight; p[i] = make_pair(weight, make_pair(x, y)); } // Sort the edges in the ascending order sort(p, p + edges); minimumCost = kruskal(p); cout << minimumCost << endl; return 0; }
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mingw32/bin/ld.exe: C:\Users\mfrom\AppData\Local\Temp\ccSKcRks.o:PizzaPi.cpp:(.text$_ZN5PizzaC2Ev[__ZN5PizzaC2Ev]+0xa): undefined reference to `vtable for Pizza' collect2.exe: error: ld returned 1 exit status
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