-
Notifications
You must be signed in to change notification settings - Fork 0
/
Ch_7_Dijkistra.c
120 lines (101 loc) · 2.37 KB
/
Ch_7_Dijkistra.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
// Dijkstra's Algorithm in C
#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;
}