Forgot the little matrix wrapper.

matrix.hpp

@@ -0,0 +1,14 @@
+#pragma once
+#include <vector>
+
+typedef std::vector<int> MatrixRow;
+typedef std::vector<MatrixRow> Matrix;
+
+/*
+ * Just a quick thing to reset a matrix to a value.
+ */
+inline void matrix_assign(Matrix &out, int new_value) {
+  for(auto &row : out) {
+    row.assign(row.size(), new_value);
+  }
+}