From 4022e5c95210631e4aceb08eaf9d9071aa5aefc4 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.001@gmail.com>
Date: Tue, 15 Sep 2026 08:16:43 +0800
Subject: Set up a git repo

---
 tests/functional/15_graph_coloring.sy | 69 +++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 tests/functional/15_graph_coloring.sy

(limited to 'tests/functional/15_graph_coloring.sy')

diff --git a/tests/functional/15_graph_coloring.sy b/tests/functional/15_graph_coloring.sy
new file mode 100644
index 0000000..6e28be5
--- /dev/null
+++ b/tests/functional/15_graph_coloring.sy
@@ -0,0 +1,69 @@
+const int V = 4;
+const int space = 32;
+const int LF = 10;
+
+void printSolution(int color[]) {
+  int i = 0;
+  while (i < V) {
+    putint(color[i]);
+    putch(space);
+    i = i + 1;
+  }
+  putch(LF);
+}
+
+void printMessage() {
+  putch(78);putch(111);putch(116);
+  putch(space);
+  putch(101);putch(120);putch(105);putch(115);putch(116);
+}
+
+int isSafe(int graph[][V], int color[]) {
+  int i = 0;
+  while (i < V) {
+    int j = i + 1;
+    while (j < V) {
+      if (graph[i][j] && color[j] == color[i])
+        return 0;
+      j = j + 1;
+    }
+    i = i + 1;
+  }
+  return 1;
+}
+
+int graphColoring(int graph[][V], int m, int i, int color[]) {
+  if (i == V) {
+    if (isSafe(graph, color)) {
+      printSolution(color);
+      return 1;
+    }
+    return 0;
+  }
+  int j = 1;
+  while (j <= m) {
+    color[i] = j;
+    if (graphColoring(graph, m, i + 1, color))
+      return 1;
+    color[i] = 0;
+    j = j + 1;
+  }
+  return 0;
+}
+
+int main() {
+  int graph[V][V] = {
+    {0, 1, 1, 1},
+    {1, 0, 1, 0},
+    {1, 1, 0, 1},
+    {1, 0, 1, 0}
+  }, m = 3;
+  int color[V], i = 0;
+  while (i < V) {
+    color[i] = 0;
+    i = i + 1;
+  }
+  if (!graphColoring(graph, m, 0, color))
+    printMessage();
+  return 0;
+}
\ No newline at end of file
-- 
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