Create 1284-minimum-number-of-flips-to-convert-binary-matrix-to-zero-matrix.js

Author: everthis

1284-minimum-number-of-flips-to-convert-binary-matrix-to-zero-matrix.js

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+/**
+ * @param {number[][]} mat
+ * @return {number}
+ */
+const minFlips = function (mat) {
+  const X = mat.length
+  const Y = mat[0].length
+  const binary = {
+    0: 1,
+    1: 2,
+    2: 4,
+    3: 8,
+    4: 16,
+    5: 32,
+    6: 64,
+    7: 128,
+    8: 256,
+  }
+  const mask = []
+  let state = 0
+  for (let i = 0; i < X; ++i) {
+    for (let j = 0; j < Y; ++j) {
+      let bit = 0
+      state += mat[i][j] * binary[Y * i + j]
+      bit += binary[Y * i + j]
+      if (i > 0) {
+        bit += binary[Y * (i - 1) + j]
+      }
+      if (i < X - 1) {
+        bit += binary[Y * (i + 1) + j]
+      }
+      if (j > 0) {
+        bit += binary[Y * i + (j - 1)]
+      }
+      if (j < Y - 1) {
+        bit += binary[Y * i + (j + 1)]
+      }
+      mask.push(bit)
+    }
+  }
+  if (state === 0) {
+    return 0
+  }
+  const set = new Set()
+  const q = [{ state: state, moves: 0 }]
+  while (q.length !== 0) {
+    const cur = q.shift()
+    if (cur.state === 0) {
+      return cur.moves
+    }
+    for (let i = 0; i < X * Y; ++i) {
+      let newState = cur.state
+      newState ^= mask[i]
+      if (!set.has(newState)) {
+        set.add(newState)
+        q.push({ state: newState, moves: cur.moves + 1 })
+      }
+    }
+  }
+  return -1
+}