Add Goldberg-Plotkin-Shannon synchronized (Delta + 1)-coloring algorithm

Makefile

@@ -1,6 +1,6 @@
 all: test benchmark check
 
-example: runners_example leader_directed_ring_example leader_undirected_ring_example leader_directed_clique_example leader_undirected_mesh_example leader_directed_hypercube_example leader_undirected_graph_example orientation_example size_estimation_example graphs_mst_example graphs_mis_example graphs_ds_example consensus_example
+example: runners_example leader_directed_ring_example leader_undirected_ring_example leader_directed_clique_example leader_undirected_mesh_example leader_directed_hypercube_example leader_undirected_graph_example orientation_example size_estimation_example graphs_mst_example graphs_mis_example graphs_ds_example consensus_example graphs_coloring_example
 
 runners_example:
 	go run example/synchronized.go 5
@@ -71,6 +71,9 @@ graphs_ds_example:
 	go run example/graphs_ds_sync_lrg.go 10 0.70
 	go run example/graphs_ds_sync_kuhn_wattenhofer.go 101 0.05 4
 
+graphs_coloring_example:
+	go run example/graphs_coloring_sync_gps.go 20 0.25
+
 unit_test:
 	go test ./leader/undirected_graph/sync_yoyo -v
 	go test ./graphs/mst/sync_ghs -v

example/graphs_coloring_sync_gps.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"github.com/krzysztof-turowski/distributed-framework/graphs/coloring/sync_gps"
+)
+
+const exitFailure = 1
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "Please specify graph size")
+		os.Exit(exitFailure)
+	}
+	if len(os.Args) < 3 {
+		fmt.Fprintln(os.Stderr, "Please specify p")
+		os.Exit(exitFailure)
+	}
+
+	n, err := strconv.Atoi(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Invalid size specification")
+		os.Exit(exitFailure)
+	}
+	p, err := strconv.ParseFloat(os.Args[2], 64)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Invalid p specification")
+	}
+	sync_gps.Run(n,p)
+
+}