diff --git a/2023/3/main-1.cpp b/2023/3/main-1.cpp
index 183bbb8..c2c0ca6 100644
--- a/2023/3/main-1.cpp
+++ b/2023/3/main-1.cpp
@@ -27,19 +27,12 @@ int main() {
 			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) {
+			for (int rr = r - 1; rr <= r + 1; rr++) {
+				if (rr < 0 || rr == lines.size())
+					continue;
+				for (int cc = c - 1; cc <= c + 1; cc++) {
+					if (cc < 0 || cc == cend)
+						continue;
 					auto& lo = lines[rr];
 					if (isDigit(lo[cc])) {
 						int ci = cc, cf = cc;
diff --git a/2023/3/main-2.cpp b/2023/3/main-2.cpp
index 5551694..dceb6e6 100644
--- a/2023/3/main-2.cpp
+++ b/2023/3/main-2.cpp
@@ -28,20 +28,14 @@ int main() {
 			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) {
+			for (int rr = r - 1; rr <= r + 1; rr++) {
+				if (rr < 0 || rr == lines.size())
+					continue;
+				for (int cc = c - 1; cc <= c + 1; cc++) {
+					if (cc < 0 || cc == cend)
+						continue;
 					auto& lo = lines[rr];
 					if (isDigit(lo[cc])) {
 						int ci = cc, cf = cc;