From 73d989eb24e65ee695f85e2e62982d461995958e Mon Sep 17 00:00:00 2001
From: gkucmierz <gkucmierz@gmail.com>
Date: Wed, 16 Aug 2017 03:42:45 +0200
Subject: [PATCH] Guess the Digits and Expression - brute force attemp

---
 guess-the-digits-and-expression/index.js | 28 ++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 guess-the-digits-and-expression/index.js

diff --git a/guess-the-digits-and-expression/index.js b/guess-the-digits-and-expression/index.js
new file mode 100644
index 0000000..25e5d3e
--- /dev/null
+++ b/guess-the-digits-and-expression/index.js
@@ -0,0 +1,28 @@
+function guessExpression(exp) {
+  let m = exp.match(/([\w\d]+)/g);
+  let sym = [m[0], m[1]];
+  let res = +m[2];
+  
+  let uniq = (sym[0] + sym[1]).split('')
+    .filter((el, i, arr) => arr.indexOf(el, i+1) === -1);
+  
+  let nums = new Array(uniq.length).fill(0);
+  
+  // brute force
+  while (1) {
+    let a = sym[0].replace(/./g, c => nums[uniq.indexOf(c)]);
+    let b = sym[1].replace(/./g, c => nums[uniq.indexOf(c)]);
+    if ((+a) * (+b) === res) {
+      return `${a} * ${b} = ${res}`;
+    }
+    for (let i = 0; i < nums .length; ++i) {
+      nums[i] += 1;
+      if (nums[i] >= 10) {
+        nums[i] = 0;
+      } else {
+        break;
+      }
+    }
+  }
+  
+}