2024 day 20

2024/20/main-1.cpp

@@ -2,13 +2,6 @@
 #include <bits/stdc++.h>
 using namespace std;
 
-const array<icoord, 4> directions = {
-	icoord(-1, 0),
-	icoord(1, 0),
-	icoord(0, -1),
-	icoord(0, 1),
-};
-
 void rec(icoord c, unordered_map<icoord, int> &m, int score) {
 	if (!m.contains(c)) {
 		return;
@@ -20,7 +13,7 @@ void rec(icoord c, unordered_map<icoord, int> &m, int score) {
 	}
 
 	s = score;
-	for (auto dir : directions) {
+	for (auto dir : icoord::units()) {
 		rec(c + dir, m, score + 1);
 	}
 }

2024/20/main-2.cpp

@@ -2,13 +2,6 @@
 #include <bits/stdc++.h>
 using namespace std;
 
-const array<icoord, 4> directions = {
-	icoord(-1, 0),
-	icoord(1, 0),
-	icoord(0, -1),
-	icoord(0, 1),
-};
-
 void rec(icoord c, unordered_map<icoord, int> &m, int score) {
 	if (!m.contains(c)) {
 		return;
@@ -20,7 +13,7 @@ void rec(icoord c, unordered_map<icoord, int> &m, int score) {
 	}
 
 	s = score;
-	for (auto dir : directions) {
+	for (auto dir : icoord::units()) {
 		rec(c + dir, m, score + 1);
 	}
 }

include/aoc.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <array>
+#include <functional>
 
 typedef long long ll;
 typedef unsigned long long ull;
@@ -15,12 +16,14 @@ template <typename T> struct Coord {
 		this->y = y;
 	}
 
-	static inline const std::array<Coord<T>, 4> units = {
-		Coord<T>(0, 1),
-		Coord<T>(1, 0),
-		Coord<T>(0, -1),
-		Coord<T>(-1, 0),
-	};
+	static inline const std::array<Coord<T>, 4> units() {
+		return {
+			Coord<T>(0, 1),
+			Coord<T>(1, 0),
+			Coord<T>(0, -1),
+			Coord<T>(-1, 0),
+		};
+	}
 
 	Coord<T> operator-() { return {-this->x, -this->y}; }