diff --git a/2023/3/main-1.cpp b/2023/3/main-1.cpp
new file mode 100644
index 0000000..90fafd6
--- /dev/null
+++ b/2023/3/main-1.cpp
@@ -0,0 +1,62 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+inline bool isDigit(char ch) {
+	return ch >= '0' && ch <= '9';
+}
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	vector<string> lines;
+	do {
+		string line;
+		getline(cin, line);
+		if (line.empty())
+			break;
+		lines.push_back(line);
+	} while (!cin.eof());
+
+	int ret = 0;
+
+	for (int r = 0; r < lines.size(); r++) {
+		auto& line = lines[r];
+		int cend = line.size();
+		for (int c = 0; c < cend; c++) {
+			char ch = line[c];
+			if (ch == '.' || isDigit(ch))
+				continue;
+			vector<int> rs = {r}, cs = {c};
+			if (r > 0) {
+				rs.push_back(r - 1);
+				if (r < lines.size() - 1)
+					rs.push_back(r + 1);
+			}
+			if (c > 0) {
+				cs.push_back(c - 1);
+				if (c < cend - 1)
+					cs.push_back(c + 1);
+			}
+			for (int rr : rs) {
+				for (int cc : cs) {
+					if (r == 0 && c == 0)
+						continue;
+					auto& lo = lines[rr];
+					if (isDigit(lo[cc])) {
+						int ci = cc, cf = cc;
+						while (ci > 0 && isDigit(lo[ci - 1]))
+							ci--;
+						while (cf < cend - 1 && isDigit(lo[cf + 1]))
+							cf++;
+						ret += stoi(lo.substr(ci, cf - ci + 1));
+						for (int i = ci; i <= cf; i++)
+							lo[i] = '.';
+					}
+				}
+			}
+		}
+	}
+
+	cout << ret << '\n';
+}
diff --git a/2023/3/main-2.cpp b/2023/3/main-2.cpp
new file mode 100644
index 0000000..290244a
--- /dev/null
+++ b/2023/3/main-2.cpp
@@ -0,0 +1,69 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+inline bool isDigit(char ch) {
+	return ch >= '0' && ch <= '9';
+}
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+
+	vector<string> lines;
+	do {
+		string line;
+		getline(cin, line);
+		if (line.empty())
+			break;
+		lines.push_back(line);
+	} while (!cin.eof());
+
+	int ret = 0;
+
+	for (int r = 0; r < lines.size(); r++) {
+		auto& line = lines[r];
+		int cend = line.size();
+		for (int c = 0; c < cend; c++) {
+			char ch = line[c];
+			if (ch != '*')
+				continue;
+			vector<int> rs = {r}, cs = {c};
+			if (r > 0) {
+				rs.push_back(r - 1);
+				if (r < lines.size() - 1)
+					rs.push_back(r + 1);
+			}
+			if (c > 0) {
+				cs.push_back(c - 1);
+				if (c < cend - 1)
+					cs.push_back(c + 1);
+			}
+			int p = 1;
+			int n = 0;
+			for (int rr : rs) {
+				for (int cc : cs) {
+					if (r == 0 && c == 0)
+						continue;
+					auto& lo = lines[rr];
+					if (isDigit(lo[cc])) {
+						int ci = cc, cf = cc;
+						while (ci > 0 && isDigit(lo[ci - 1]))
+							ci--;
+						while (cf < cend - 1 && isDigit(lo[cf + 1]))
+							cf++;
+						p *= stoi(lo.substr(ci, cf - ci + 1));
+						for (int i = ci; i <= cf; i++)
+							lo[i] = '.';
+						if (++n > 2)
+							goto rrccend;
+					}
+				}
+			}
+		rrccend:
+			if (n == 2)
+				ret += p;
+		}
+	}
+
+	cout << ret << '\n';
+}