From 2f43aade2ed78389b32fd48598a2bf85ca9fdd9c Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 02:13:02 -0700
Subject: a different z3 constraint encoding

---
 entries/funemy/z3/z4fib.sh | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100755 entries/funemy/z3/z4fib.sh

diff --git a/entries/funemy/z3/z4fib.sh b/entries/funemy/z3/z4fib.sh
new file mode 100755
index 0000000..97ae59b
--- /dev/null
+++ b/entries/funemy/z3/z4fib.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# z3 fib, but better
+
+# Instructions:
+#  1. having z3 installed and put under your $PATH
+#  2. making sure z4fib.sh is executable, by `chmod +x z3fib.sh`
+#  3. running as `./z4fib.sh [length of the fib sequence]`
+#  4. having fun :)
+
+if [ -e fib.smt2 ]
+then
+    rm -f fib.smt2
+    touch fib.smt2
+else
+    touch fib.smt2
+fi
+
+if [ "$1" -lt "0" ]; then
+  echo "Argument must be larger than 0."
+  exit 1
+fi
+
+echo "(declare-const fib (Seq Int))" >> fib.smt2
+echo "" >> fib.smt2
+echo "(assert" >> fib.smt2
+echo "  (and" >> fib.smt2
+echo "    (= (seq.len fib) $1)" >> fib.smt2
+echo "    (= (seq.nth fib 0) 0)" >> fib.smt2
+echo "    (= (seq.nth fib 1) 1)" >> fib.smt2
+echo "    (forall ((i Int))" >> fib.smt2
+echo "      (=> (and (> i 1) (< i (seq.len fib)))" >> fib.smt2
+echo "        (= (seq.nth fib i)" >> fib.smt2
+echo "          (+ (seq.nth fib (- i 1))" >> fib.smt2
+echo "            (seq.nth fib (- i 2))))))))" >> fib.smt2
+
+
+echo "(check-sat)" >> fib.smt2
+echo "(get-model)" >> fib.smt2
+
+z3 fib.smt2
-- 
cgit v1.2.3-70-g09d2


From 600860ba1a35df6e003a6f5cdab6fbf65cbd698d Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 02:16:34 -0700
Subject: update people.json

---
 people.json | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/people.json b/people.json
index 6499425..55b1ad4 100644
--- a/people.json
+++ b/people.json
@@ -69,6 +69,10 @@
                 "name": "z3",
                 "link": "./entries/funemy/z3/z3fib.sh"
             },
+            {
+                "name": "z4",
+                "link": "./entries/funemy/z3/z4fib.sh"
+            },
             {
                 "name": "symbolic",
                 "link": "./entries/funemy/symbolic/phib.py"
-- 
cgit v1.2.3-70-g09d2


From cf530ca49024dbdac4234c52a6838fb209ab6cb6 Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 02:18:23 -0700
Subject: when i still have chance to format

---
 entries/funemy/z3/z4fib.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/entries/funemy/z3/z4fib.sh b/entries/funemy/z3/z4fib.sh
index 97ae59b..b7488e4 100755
--- a/entries/funemy/z3/z4fib.sh
+++ b/entries/funemy/z3/z4fib.sh
@@ -32,6 +32,7 @@ echo "      (=> (and (> i 1) (< i (seq.len fib)))" >> fib.smt2
 echo "        (= (seq.nth fib i)" >> fib.smt2
 echo "          (+ (seq.nth fib (- i 1))" >> fib.smt2
 echo "            (seq.nth fib (- i 2))))))))" >> fib.smt2
+echo "" >> fib.smt2
 
 
 echo "(check-sat)" >> fib.smt2
-- 
cgit v1.2.3-70-g09d2


From 1f35f0d22a4cd0bd837b26e8b019345532da89e6 Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 02:21:15 -0700
Subject: minor

---
 entries/funemy/z3/z3fib.sh | 2 +-
 entries/funemy/z3/z4fib.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/entries/funemy/z3/z3fib.sh b/entries/funemy/z3/z3fib.sh
index 07ab418..e96226f 100755
--- a/entries/funemy/z3/z3fib.sh
+++ b/entries/funemy/z3/z3fib.sh
@@ -15,7 +15,7 @@ else
 fi
 
 if [ "$1" -lt "0" ]; then
-  echo "Argument must be larger than 0."
+  echo "Argument must be larger or equal to 0."
   exit 1
 fi
 
diff --git a/entries/funemy/z3/z4fib.sh b/entries/funemy/z3/z4fib.sh
index b7488e4..983a752 100755
--- a/entries/funemy/z3/z4fib.sh
+++ b/entries/funemy/z3/z4fib.sh
@@ -16,7 +16,7 @@ else
 fi
 
 if [ "$1" -lt "0" ]; then
-  echo "Argument must be larger than 0."
+  echo "Argument must be larger or equal to 0."
   exit 1
 fi
 
-- 
cgit v1.2.3-70-g09d2


From ae3c469407df59439fb0346344990c0155dcd7a2 Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 02:23:05 -0700
Subject: redundant line

---
 entries/funemy/z3/z4fib.sh | 1 -
 1 file changed, 1 deletion(-)

diff --git a/entries/funemy/z3/z4fib.sh b/entries/funemy/z3/z4fib.sh
index 983a752..d5ad2d9 100755
--- a/entries/funemy/z3/z4fib.sh
+++ b/entries/funemy/z3/z4fib.sh
@@ -34,7 +34,6 @@ echo "          (+ (seq.nth fib (- i 1))" >> fib.smt2
 echo "            (seq.nth fib (- i 2))))))))" >> fib.smt2
 echo "" >> fib.smt2
 
-
 echo "(check-sat)" >> fib.smt2
 echo "(get-model)" >> fib.smt2
 
-- 
cgit v1.2.3-70-g09d2


From cdec98dc53617c3ad5c297f8f5d127013c111b6d Mon Sep 17 00:00:00 2001
From: funemy
Date: Tue, 25 Oct 2022 12:54:05 -0700
Subject: typo

---
 entries/funemy/z3/z4fib.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/entries/funemy/z3/z4fib.sh b/entries/funemy/z3/z4fib.sh
index d5ad2d9..f7a1e48 100755
--- a/entries/funemy/z3/z4fib.sh
+++ b/entries/funemy/z3/z4fib.sh
@@ -3,7 +3,7 @@
 
 # Instructions:
 #  1. having z3 installed and put under your $PATH
-#  2. making sure z4fib.sh is executable, by `chmod +x z3fib.sh`
+#  2. making sure z4fib.sh is executable, by `chmod +x z4fib.sh`
 #  3. running as `./z4fib.sh [length of the fib sequence]`
 #  4. having fun :)
 
-- 
cgit v1.2.3-70-g09d2