Create ShortestPath.cpp

ShortestPath.cpp

@@ -0,0 +1,97 @@
+#include <bits/stdc++.h>
+using namespace std;
+int indegree[6];
+int weight[6][6];
+void AddEdge(int adj[6][6], int u, int v, int num)
+{
+    adj[u][v] = 1;
+    weight[u][v] = num;
+    indegree[v]++;
+}
+vector<int> v;
+void TopologicalSort(int adj[6][6],int indegree[])
+{
+    queue<int> q;
+    bool visited[6];
+    for (int i = 0; i < 6;i++)
+    {
+        visited[i] = false;
+        if(indegree[i]==0)
+        {
+            q.push(i);
+        }
+    }
+    while(!q.empty())
+    {
+        int a = q.front();
+        q.pop();
+        v.push_back(a);
+        visited[a] = true;
+        for (int i = 0; i < 6;i++)
+        {
+            if(adj[a][i]==1&&visited[i]==false)
+            {
+                visited[i] = true;
+            }
+                indegree[i]--;
+            if(indegree[i]==0)
+            {
+                q.push(i);
+            }
+        }
+    }
+}
+int dist[6];
+void Shortest(int adj[6][6], int u)
+{
+    dist[u] = 0;
+    for (int i = 0; i < 6;i++)
+    {
+        for (int j = 0; j < 6;j++)
+        {
+            if(adj[v[i]][j]==1)
+            {
+                if(dist[j]>dist[v[i]]+weight[v[i]][j])
+                {
+                    dist[j] = dist[v[i]] + weight[v[i]][j];
+                }
+            }
+        }
+    }
+}
+int main()
+{
+    int n;
+    // cin >> n;
+    int adj[6][6];
+    for (int i = 0; i < 6; i++)
+    {
+        indegree[i] = 0;
+    }
+    for (int i = 0; i < 6; i++)
+    {
+        dist[i] = INT_FAST16_MAX;
+    }
+    for (int i = 0; i < 6;i++)
+    {
+        for (int j = 0; j < 6;j++)
+        {
+            weight[i][j] = 0;
+            adj[i][j] = -1;
+        }
+    }
+    AddEdge(adj, 0, 1, 2);
+    AddEdge(adj, 1, 2, 3);
+    AddEdge(adj, 2, 3, 6);
+    AddEdge(adj, 0, 4, 1);
+    AddEdge(adj, 4, 2, 2);
+    AddEdge(adj, 4, 5, 4);
+    AddEdge(adj, 5, 3, 1);
+    TopologicalSort(adj, indegree);
+    Shortest(adj, 0);
+    // distance of each node from 0 node;
+    for (int i = 0; i < 6;i++)
+    {
+        cout << dist[i] << " ";
+    }
+}