Update 2184-number-of-ways-to-build-sturdy-brick-wall.js

Author: everthis

2184-number-of-ways-to-build-sturdy-brick-wall.js

@@ -1,3 +1,57 @@
+/**
+ * @param {number} height
+ * @param {number} width
+ * @param {number[]} bricks
+ * @return {number}
+ */
+const buildWall = function (height, width, bricks) {
+  const mod = 1e9 + 7
+  const avail = []
+  const bset = new Set(bricks)
+  const m = width - 1, limit = 1 << m
+  for(let mask = 0; mask < limit; mask++) {
+    const idxArr = [-1]
+    for(let j = 0; j < m; j++) {
+      if((mask >> j) & 1) idxArr.push(j)
+    }
+    idxArr.push(m)
+    let flag = true
+    for(let j = 1, len = idxArr.length; j < len; j++) {
+      if(!bset.has(idxArr[j] - idxArr[j - 1])) {
+        flag = false
+        break
+      }
+    }
+    if(flag) avail.push(mask)
+  }
+  
+  let res = 0
+  if(height === 1) return avail.length
+  const dp = Array.from({ length: height }, () => Array(limit).fill(0))
+  for(const mask of avail) {
+    dp[0][mask] = 1
+  }
+  
+  for(let i = 1; i < height; i++) {
+    for(let j = 0, len = avail.length; j < len; j++) {
+      const cur = avail[j]
+      for(let k = 0; k < len; k++) {
+        const pre = avail[k]
+        if((cur & pre) === 0) {
+          dp[i][cur] = (dp[i][cur] + dp[i - 1][pre]) % mod
+        }
+      }
+      if(i === height - 1) {
+        res = (res + dp[i][cur]) % mod
+      }
+    }
+  }
+  
+  return res
+}
+
+// another
+
 /**
  * @param {number} height
  * @param {number} width