New Commit

Author: coder-mayank22

Dijkstra's_algo.c

@@ -0,0 +1,118 @@
+#include <stdio.h>
+#define INFINITY 9999
+#define MAX 10
+
+void Dijkstra(int Graph[MAX][MAX], int n, int start);
+
+void Dijkstra(int Graph[MAX][MAX], int n, int start) {
+  int cost[MAX][MAX], distance[MAX], pred[MAX];
+  int visited[MAX], count, mindistance, nextnode, i, j;
+
+  // Creating cost matrix
+  for (i = 0; i < n; i++)
+    for (j = 0; j < n; j++)
+      if (Graph[i][j] == 0)
+        cost[i][j] = INFINITY;
+      else
+        cost[i][j] = Graph[i][j];
+
+  for (i = 0; i < n; i++) {
+    distance[i] = cost[start][i];
+    pred[i] = start;
+    visited[i] = 0;
+  }
+
+  distance[start] = 0;
+  visited[start] = 1;
+  count = 1;
+
+  while (count < n - 1) {
+    mindistance = INFINITY;
+
+    for (i = 0; i < n; i++)
+      if (distance[i] < mindistance && !visited[i]) {
+        mindistance = distance[i];
+        nextnode = i;
+      }
+
+    visited[nextnode] = 1;
+    for (i = 0; i < n; i++)
+      if (!visited[i])
+        if (mindistance + cost[nextnode][i] < distance[i]) {
+          distance[i] = mindistance + cost[nextnode][i];
+          pred[i] = nextnode;
+        }
+    count++;
+  }
+
+  // Printing the distance
+  for (i = 0; i < n; i++)
+    if (i != start) {
+      printf("\nDistance from source to %d: %d", i, distance[i]);
+    }
+}
+int main() {
+  int Graph[MAX][MAX], i, j, n, u;
+  n = 7;
+
+  Graph[0][0] = 0;
+  Graph[0][1] = 0;
+  Graph[0][2] = 1;
+  Graph[0][3] = 2;
+  Graph[0][4] = 0;
+  Graph[0][5] = 0;
+  Graph[0][6] = 0;
+
+  Graph[1][0] = 0;
+  Graph[1][1] = 0;
+  Graph[1][2] = 2;
+  Graph[1][3] = 0;
+  Graph[1][4] = 0;
+  Graph[1][5] = 3;
+  Graph[1][6] = 0;
+
+  Graph[2][0] = 1;
+  Graph[2][1] = 2;
+  Graph[2][2] = 0;
+  Graph[2][3] = 1;
+  Graph[2][4] = 3;
+  Graph[2][5] = 0;
+  Graph[2][6] = 0;
+
+  Graph[3][0] = 2;
+  Graph[3][1] = 0;
+  Graph[3][2] = 1;
+  Graph[3][3] = 0;
+  Graph[3][4] = 0;
+  Graph[3][5] = 0;
+  Graph[3][6] = 1;
+
+  Graph[4][0] = 0;
+  Graph[4][1] = 0;
+  Graph[4][2] = 3;
+  Graph[4][3] = 0;
+  Graph[4][4] = 0;
+  Graph[4][5] = 2;
+  Graph[4][6] = 0;
+
+  Graph[5][0] = 0;
+  Graph[5][1] = 3;
+  Graph[5][2] = 0;
+  Graph[5][3] = 0;
+  Graph[5][4] = 2;
+  Graph[5][5] = 0;
+  Graph[5][6] = 1;
+
+  Graph[6][0] = 0;
+  Graph[6][1] = 0;
+  Graph[6][2] = 0;
+  Graph[6][3] = 1;
+  Graph[6][4] = 0;
+  Graph[6][5] = 1;
+  Graph[6][6] = 0;
+
+  u = 0;
+  Dijkstra(Graph, n, u);
+
+  return 0;
+}