minWindow

Author: aouos

README.md

@@ -31,6 +31,7 @@
 | 0070 | [climbStairs](./code/0070_climbStairs) | ⭐ | DP |  |
 | 0074 | [searchMatrix](./code/0074_searchMatrix) | ⭐⭐ | Binary Search |  |
 | 0075 | [sortColors](./code/0075_sortColors) | ⭐⭐ | Two Pointers, Array | 2️⃣✅ |
+| 0076 | [minWindow](./code/0076_minWindow) | ⭐⭐⭐ | Sliding Window | 1️⃣ |
 | 0078 | [subsets](./code/0078_subsets) | ⭐⭐ | Array, Backtracking |  |
 | 0086 | [partition](./code/0086_partition) | ⭐⭐ | Linked List |  |
 | 0088 | [merge](./code/0088_merge) | ⭐ | Array, Two Pointers |  |

code/0076_minWindow/minWindow-sliderwindow.js

@@ -0,0 +1,45 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {string}
+ */
+var minWindow = function (s, t) {
+  let minLen = s.length + 1;
+  let start = s.length;
+  let map = new Map();
+
+  for (const c of t) {
+    map[c] ? map[c]++ : map[c] = 1;
+  }
+
+  let need = Object.keys(map).length;
+  let l = 0, r = 0;
+  while (r < s.length) {
+    if (map[s[r]] !== undefined) {
+      map[s[r]]--;
+    }
+    if (map[s[r]] === 0) {
+      need--;
+    }
+    while (need === 0) {
+      if (r - l + 1 < minLen) {
+        minLen = Math.min(minLen, r - l + 1);
+        start = l;
+      }
+      if (map[s[l]] !== undefined) {
+        map[s[l]]++;
+      }
+      if (map[s[l]] > 0) {
+        need++;
+      }
+      l++;
+    }
+    r++;
+  }
+  if (start === s.length) {
+    return '';
+  }
+  return s.substring(start, start + minLen);
+};
+
+console.log(minWindow("a", "a"));