diff --git a/2022/RESULTS.txt b/2022/RESULTS.txt
index 34d5852..3a6642e 100644
--- a/2022/RESULTS.txt
+++ b/2022/RESULTS.txt
@@ -70,10 +70,18 @@ aoc-c: res=2760
 
 +++++++++++++++++ part 1
 aoc.bash: res=444
-	time: 0:00.04 real, 0.04 user, 0.00 sys
-	context-switch:	5+1, page-faults: 0+338
+	time: 0:00.02 real, 0.01 user, 0.00 sys
+	context-switch:	0+1, page-faults: 0+258
+
+aoc-c: res=444
+	time: 0:00.00 real, 0.00 user, 0.00 sys
+	context-switch:	0+1, page-faults: 0+87
 
 +++++++++++++++++ part 2
 aoc.bash: res=801
-	time: 0:00.04 real, 0.03 user, 0.00 sys
-	context-switch:	0+1, page-faults: 0+336
+	time: 0:00.02 real, 0.01 user, 0.00 sys
+	context-switch:	1+1, page-faults: 0+261
+
+aoc-c: res=801
+	time: 0:00.00 real, 0.00 user, 0.00 sys
+	context-switch:	0+1, page-faults: 0+87
diff --git a/2022/day04/aoc-c.c b/2022/day04/aoc-c.c
new file mode 100644
index 0000000..587bc28
--- /dev/null
+++ b/2022/day04/aoc-c.c
@@ -0,0 +1,43 @@
+/* aoc-c.c: Advent of Code 2022, day 3
+ *
+ * Copyright (C) 2022 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aoc.h"
+
+static int parse(int part)
+{
+    int res = 0, val[4];
+
+    while (scanf("%d-%d,%d-%d", val, val+1, val+2, val+3) == 4) {
+        if (part == 1) {
+            if ( (val[0] >= val[2] && val[1] <= val[3] ) ||
+                 (val[0] <= val[2] && val[1] >= val[3] ) ) {
+                res++;
+            }
+        } else {
+            if ( (val[0] >= val[2] && val[0] <= val[3] ) ||
+                 (val[0] <= val[2] && val[1] >= val[2] ) ) {
+                res++;
+            }
+        }
+    }
+    return res;
+}
+
+int main(int ac, char **av)
+{
+    printf("%s: res=%d\n", *av, parse(parseargs(ac, av)));
+    exit(0);
+}
diff --git a/2022/day04/aoc.bash b/2022/day04/aoc.bash
index 1663dda..0135044 100755
--- a/2022/day04/aoc.bash
+++ b/2022/day04/aoc.bash
@@ -18,7 +18,7 @@ export LANG=C
 parse() {
     local -i _part="$1"
     local -a _arr
-    global -ig res=0
+    declare -ig res=0
 
     while IFS=-, read -ra _arr; do
         # shellcheck disable=2068
@@ -26,7 +26,7 @@ parse() {
         if (( _part == 1 )); then
             (( ( ($1 >= $3 && $2 <= $4) || ($1 <= $3 && $2 >= $4) ) && res++ ))
         else
-            (( ( ($1 >= $3 && $1 <= $4) || ($3 >= $1 && $3 <= $2) ) && res++ ))
+            (( ( ($1 >= $3 && $1 <= $4) || ($1 <= $3 && $2 >= $3) ) && res++ ))
         fi
     done
 }