1038. Recover the Smallest Number (30)-PAT甲级真题(贪心算法)

Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given {32, 321, 3214, 0229, 87}, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321-3214 with respect to different orders of combinations of these segments, and the smallest number is 0229-321-3214-32-87.

Input Specification:

Each input file contains one test case. Each case gives a positive integer N (<=10000) followed by N number segments. Each segment contains a non-negative integer of no more than 8 digits. All the numbers in a line are separated by a space.

Output Specification:

For each test case, print the smallest number in one line. Do not output leading zeros.

Sample Input:
5 32 321 3214 0229 87
Sample Output:
分析:贪心算法。让我们一起来见证cmp函数的强大之处!!~~不是按照字典序排列就可以的,必须保证两个字符串构成的数字是最小的才行,所以cmp函数写成return a + b < b + a;的形式,保证它排列按照能够组成的最小数字的形式排列。
注意:如果移出了0之后发现s.length() == 0了,说明这个数是0,那么要特别地输出这个0,否则会什么都不输出~


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