def solution(s, t): result = [] for i in range(len(s)): if s[i] in t: coll = set() for j in range(i, len(s)): if s[j] in t: coll.add(s[j]) if len(coll) == len(t): result.append(s[i:j+1]) if result: return min(result, key=len) return ""
def solution(s, t): result = [] for i in range(len(s)): if s[i] in t: coll = set() for j in range(i, len(s)): if s[j] in t: coll.add(s[j]) if len(coll) == len(t): result.append(s[i:j+1]) if result: return min(result, key=len) return ""