Update 990-satisfiability-of-equality-equations.js

Author: everthis

990-satisfiability-of-equality-equations.js

@@ -21,3 +21,43 @@ const equationsPossible = function(equations) {
         return uf[x];
     }
 };
+
+
+// another
+
+/**
+ * @param {string[]} equations
+ * @return {boolean}
+ */
+const equationsPossible = function(equations) {
+  const num = 26
+  const visited = new Array(num).fill(false)
+  const color = new Array(num).fill(-1)
+  const adj = Array.from(new Array(num), el => [])
+  const aCode = ('a').charCodeAt(0)
+  for(let el of equations) {
+    if(el[1] === '=') {
+      adj[el[0].charCodeAt(0) - aCode].push(el[3].charCodeAt(0) - aCode)
+      adj[el[3].charCodeAt(0) - aCode].push(el[0].charCodeAt(0) - aCode)
+    }
+  }
+  let c = 0
+  for(let i = 0; i < num; i++) {
+    !visited[i] && dfs(i, c)
+    c++
+  }
+  for(let el of equations) {
+    if(el[1] === '!' && color[el[0].charCodeAt(0) - aCode] === color[el[3].charCodeAt(0) - aCode]) {
+      return false
+    }
+  }
+  return true
+  
+  function dfs(idx, val) {
+    visited[idx] = true
+    color[idx] = val
+    for(let el of adj[idx]) {
+      !visited[el] && dfs(el, val)
+    }
+  }
+};