2024 day 1

2024/1/main-1.cpp

@@ -0,0 +1,28 @@
+#include <bits/stdc++.h>
+#include <sstream>
+using namespace std;
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	vector<int> l1, l2;
+	string line;
+	while (getline(cin, line) && !line.empty()) {
+		istringstream l(line);
+		int a, b;
+		l >> a >> b;
+		l1.push_back(a);
+		l2.push_back(b);
+	}
+
+	sort(l1.begin(), l1.end());
+	sort(l2.begin(), l2.end());
+
+	long long result = 0;
+	for (auto i = 0; i < l1.size(); i++) {
+		result += abs(l1[i] - l2[i]);
+	}
+
+	cout << result << '\n';
+}

2024/1/main-2.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+#include <sstream>
+using namespace std;
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	vector<int> l1;
+	multiset<int> l2;
+	string line;
+	while (getline(cin, line) && !line.empty()) {
+		istringstream l(line);
+		int a, b;
+		l >> a >> b;
+		l1.push_back(a);
+		l2.insert(b);
+	}
+
+	long long result = 0;
+	for (auto i : l1) {
+		result += i * l2.count(i);
+	}
+
+	cout << result << '\n';
+}