1 files changed, 16 insertions, 0 deletions
diff --git a/snippets/group.h b/snippets/group.h
new file mode 100644
index 0000000..bd183e0
--- /dev/null
+++ b/snippets/group.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <functional>
+#include <ranges>
+
+template <std::ranges::random_access_range Range>
+void group(const Range &v, const std::function<void(int, int)> &fn) {
+  int n = v.size();
+  for (int i = 0; i < n;) {
+    auto i0 = i;
+    while (i < n && v[i0] == v[i]) {
+      i++;
+    }
+    fn(i0, i);
+  }
+}