diff --git a/examples/aoc2024/day08/part1.jou b/examples/aoc2024/day08/part1.jou
index dadf638f..7656c926 100644
--- a/examples/aoc2024/day08/part1.jou
+++ b/examples/aoc2024/day08/part1.jou
@@ -40,10 +40,11 @@ def main() -> int:
             *p = '.'
 
     freqs: byte[100]
+    memset(&freqs, 0, sizeof(freqs))
     nfreqs = 0
     for p = antennas.data; *p != '\0'; p++:
         if *p != '.' and *p != '\n' and strchr(freqs, *p) == NULL:
-            assert nfreqs < sizeof(freqs)/sizeof(freqs[0])
+            assert nfreqs + 1 < sizeof(freqs)/sizeof(freqs[0])
             freqs[nfreqs++] = *p
 
     for i = 0; i < nfreqs; i++:
diff --git a/examples/aoc2024/day08/part2.jou b/examples/aoc2024/day08/part2.jou
index b4fb0894..d39d875b 100644
--- a/examples/aoc2024/day08/part2.jou
+++ b/examples/aoc2024/day08/part2.jou
@@ -64,10 +64,11 @@ def main() -> int:
             *p = '.'
 
     freqs: byte[100]
+    memset(&freqs, 0, sizeof(freqs))
     nfreqs = 0
     for p = antennas.data; *p != '\0'; p++:
         if *p != '.' and *p != '\n' and strchr(freqs, *p) == NULL:
-            assert nfreqs < sizeof(freqs)/sizeof(freqs[0])
+            assert nfreqs + 1 < sizeof(freqs)/sizeof(freqs[0])
             freqs[nfreqs++] = *p
 
     for i = 0; i < nfreqs; i++:
diff --git a/examples/aoc2024/day11/part1.jou b/examples/aoc2024/day11/part1.jou
index 639b50a2..414a4e9a 100644
--- a/examples/aoc2024/day11/part1.jou
+++ b/examples/aoc2024/day11/part1.jou
@@ -70,4 +70,5 @@ def main() -> int:
         nstones = blink(stones, nstones)
     printf("%d\n", nstones)  # Output: 55312
 
+    free(stones)
     return 0
diff --git a/examples/aoc2024/day12/part1.jou b/examples/aoc2024/day12/part1.jou
index b8e58048..39fc5796 100644
--- a/examples/aoc2024/day12/part1.jou
+++ b/examples/aoc2024/day12/part1.jou
@@ -89,4 +89,6 @@ def main() -> int:
                 result += (fence1 + fence2) * area
 
     printf("%d\n", result)  # Output: 1930
+
+    free(grid.data)
     return 0
diff --git a/examples/aoc2024/day12/part2.jou b/examples/aoc2024/day12/part2.jou
index 2c35b012..9932bc28 100644
--- a/examples/aoc2024/day12/part2.jou
+++ b/examples/aoc2024/day12/part2.jou
@@ -102,4 +102,6 @@ def main() -> int:
                 result += (fence1 + fence2) * area
 
     printf("%d\n", result)  # Output: 368
+
+    free(grid.data)
     return 0