add: 只出现一次的数字等

src/array/find-common-characters.js

@@ -0,0 +1,44 @@
+/**
+ * @param {string[]} A
+ * @return {string[]}
+ */
+export const commonChars = function (A) {
+  const res = []
+  let chars = new Set(A[0].split('')) // 不重复的chat集合
+  for (let n = 1; n < A.length; n++) {
+    const b = new Set(A[n].split(''))
+    chars = new Set([...b].filter(x => chars.has(x)))
+  }
+
+  const maps = []
+
+  for (let n = 0; n < A.length; n++) {
+    const tmp = new Map()
+    for (let i = 0; i < A[n].length; i++) {
+      if (chars.has(A[n][i])) {
+        if (tmp.has(A[n][i])) {
+          tmp.set(A[n][i], tmp.get(A[n][i]) + 1)
+        } else {
+          tmp.set(A[n][i], 1)
+        }
+      }
+    }
+    maps.push(tmp)
+  }
+
+  chars = [...chars]
+
+  for (const n in chars) {
+    let min = -1
+    for (const i in maps) {
+      if (maps[i].get(chars[n]) < min || min === -1) {
+        min = maps[i].get(chars[n])
+      }
+    }
+    for (let x = 0; x < min; x++) {
+      res.push(chars[n])
+    }
+  }
+
+  return res
+}