add: 最小覆盖子串

src/string/minimum-window-substring.js

@@ -0,0 +1,40 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {string}
+ */
+export const minWindow = function (s, t) {
+  const sLen = s.length; const tLen = t.length
+  const tMap = new Map(); const map = new Map()
+  let l = 0; let r = 0; let res = ''
+
+  for (let i = 0; i < tLen; i++) {
+    tMap.set(t[i], (tMap.get(t[i]) || 0) + 1)
+  }
+
+  const check = (cMap) => {
+    const check = new Map(
+      [...cMap].filter(([k, v]) => tMap.has(k) && v >= tMap.get(k))
+    )
+
+    return check.size === tMap.size
+  }
+
+  while (r <= sLen) {
+    if (t.includes(s[r])) {
+      map.set(s[r], (map.get(s[r]) || 0) + 1)
+    }
+
+    while (check(map) && l <= r) {
+      const tmp = s.slice(l, r + 1)
+      if (res.length === 0 || tmp.length <= res.length) res = tmp
+      if (t.includes(s[l]) && map.has(s[l])) {
+        map.set(s[l], map.get(s[l]) - 1)
+      }
+      l++
+    }
+    r++
+  }
+
+  return res
+}