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Use two boolean flag1[256], flag2[256]. Firstly, set the character of str2 to true in flag2. Then traverse str1, if flag1[i] == false, then set it true. else find it in flag2, if flag2 is not true, means this duplicate character is not in str2, so return false. at last of the function, return true. O(n)
- tengdongyang March 18, 2012