diff --git a/.zed/debug.json b/.zed/debug.json
new file mode 100644
index 0000000..8849f8d
--- /dev/null
+++ b/.zed/debug.json
@@ -0,0 +1,13 @@
+[
+  {
+    "label": "Debug td6 exo1",
+    "build": {
+      "command": "gcc",
+      "args": ["-o", "./exe", "-lm", "-g", "td6/exo1.c"],
+      "cwd": "$ZED_WORKTREE_ROOT",
+    },
+    "program": "$ZED_WORKTREE_ROOT/exe",
+    "request": "launch",
+    "adapter": "CodeLLDB",
+  },
+]
diff --git a/td6/exo1.c b/td6/exo1.c
new file mode 100644
index 0000000..c3704e0
--- /dev/null
+++ b/td6/exo1.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void print_t(int t[], int len) {
+    printf("[");
+    for (int i = 0; i < len; i++) {
+        printf("%d,", t[i]);
+    }
+    printf("]\n");
+}
+
+void quicksort(int t[], int len) {
+    if (len < 2) {
+        return;
+    }
+    int ip = len / 2;
+    int p = t[ip];
+    int a = 0;
+    int b = len - 1;
+
+    while (a < b) {
+        while (t[a] < p && a < b) {
+            a++;
+            if (a >= ip) {
+                int tmp = t[a];
+                t[a] = t[ip];
+                t[ip] = tmp;
+                ip++;
+                a--;
+            }
+        }
+        while (t[b] > p && a < b) {
+            b--;
+            if (b <= ip) {
+                int tmp = t[b];
+                t[b] = t[ip];
+                t[ip] = tmp;
+                ip--;
+                b++;
+            }
+        }
+        int tmp = t[a];
+        t[a] = t[b];
+        t[b] = tmp;
+        a++;
+        b--;
+    }
+    quicksort(t, ip);
+    quicksort(t + ip + 1, len - ip - 1);
+}
+
+int main() {
+    int t[] = {0, -7, 4, -2, 2, -3};
+    quicksort(t, 6);
+    print_t(t, 6);
+    return 0;
+}