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E. Different Subsets For All Tuples 题目连接： http://www.codeforces.com/contest/660/problem/E Description For a sequence a of n integers between 1 and m, 阅读全文
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Warm up 2 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=4619 Description Some 1×2 dominoes are placed on a plane. Each dominoe is placed either hori 阅读全文
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Palindrome Sub Array 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=4618 Description A palindrome sequence is a sequence which is as same as its reve 阅读全文
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Warm up 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=4612 Description N planets are connected by M bidirectional channels that allow instant transp 阅读全文
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Balls Rearrangement 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=4611 Description Bob has N balls and A boxes. He numbers the balls from 0 to N 1, 阅读全文
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D. Number of Parallelograms 题目连接： http://www.codeforces.com/contest/660/problem/D Description You are given n points on a plane. All the points are di 阅读全文
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C. Hard Process 题目连接： http://www.codeforces.com/contest/660/problem/C Description You are given an array a with n elements. Each element of a is eithe 阅读全文
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B. Seating On Bus 题目连接： http://www.codeforces.com/contest/660/problem/B Description Consider 2n rows of the seats in a bus. n rows of the seats on the 阅读全文
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A. Co prime Array 题目连接： http://www.codeforces.com/contest/660/problem/A Description You are given an array of n elements, you must make it a co prime 阅读全文