Python, easy to understand, no weird tricks
\nimport collections\nclass Solution(object):\n    def minWindow(self, s, t):\n        """\n        :type s: str\n        :type t: str\n        :rtype: str\n   
```\nimport collections\nclass Solution(object):\n    def minWindow(self, s, t):\n        """\n        :type s: str\n        :type t: str\n        :rtype: str\n        """\n        if len(s) < len(t):\n            return ""\n        \n        hashmap = collections.Counter(t)\n        counter = len(t)\n        min_window = ""\n        start, end = 0, 0\n        \n        \n        for end in range(len(s)):\n            if hashmap[s[end]] > 0:\n                counter -= 1\n            hashmap[s[end]] -= 1\n            \n            while counter == 0:\n                length = end - start + 1\n                \n                if not min_window or len(min_window) > length:\n                    min_window = s[start:end+1]\n                \n                hashmap[s[start]] += 1\n\n                if hashmap[s[start]] > 0:\n                    counter += 1\n                \n                start += 1\n        return min_window\n                \n                \n        \n```
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