Weekly Challenge Blast from the Past

2 files changed, 72 insertions, 0 deletions

diff --git a/challenge-012/zapwai/javascript/ch-1.js b/challenge-012/zapwai/javascript/ch-1.js
new file mode 100644
index 0000000000..f16531410b
--- /dev/null
+++ b/challenge-012/zapwai/javascript/ch-1.js
@@ -0,0 +1,49 @@
+let primes = [2];
+
+function is_prime(num) {
+    for (let p of primes) {
+	if (p < num) {
+	    if (num % p == 0)
+		return false;
+	}
+	else {
+	    break;
+	}
+    }
+    return true;
+}
+
+function primorial(n) {
+    let p = 1;
+    while (n > 0) {
+	n--;
+	p *= primes[n];
+    }
+    return p;
+}
+
+function fill_primes(num) {
+    let i = 2;
+    while (primes[primes.length-1] < num) {
+	i++;
+	let cnt = 0;
+	for (let j = 0; j < primes.length; j++) {
+	    if (i % primes[j] == 0)
+		cnt++;
+	}
+	if (cnt == 0)
+	    primes.push(i);
+    }
+}
+
+function euclid(i) {
+    return 1 + primorial(i);
+}
+
+fill_primes(15000);
+for (let i = 2; i < 8; i++) {
+    if (!(is_prime(euclid(i)))) {
+	console.log(euclid(i));
+	break;
+    }
+}
diff --git a/challenge-012/zapwai/javascript/ch-2.js b/challenge-012/zapwai/javascript/ch-2.js
new file mode 100644
index 0000000000..fecd56d950
--- /dev/null
+++ b/challenge-012/zapwai/javascript/ch-2.js
@@ -0,0 +1,23 @@
+let input = `/a/b/c/d
+/a/b/cd
+/a/b/cc
+/a/b/c/d/e`;
+
+function proc(input) {
+    let line = input.split("\n");
+    let prefix = line[0];
+    let cnt = 1;
+    while (cnt > 0) {
+        cnt = 0;
+        prefix = prefix.slice(0,prefix.lastIndexOf("/"));
+        for (let i = 0; i < line.length; i++) {
+	    let pattern = new RegExp("^"+prefix+"/");
+            if (!pattern.test(line[i])) {
+		cnt++;
+	    }
+	}
+    }
+    return prefix;
+}
+
+console.log(proc(input))