PAT 1038 体验Python之美

1038. Recover the Smallest Number (30)

时间限制

400 ms

内存限制

32000 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

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:

22932132143287

我做题都是先用python秒一下，要是超时什么的就换C++了，这题我一看，就写了下面这一行代码：

print int(''.join(sorted(raw_input().split()[:], lambda s1, s2: cmp(s1+s2, s2+s1))))

是的只有一行！可惜最后一个test还是超时了。于是用C++再写：

#include <set>

#include <sstream>

#include <string>

#include <iostream>

using namespace std;

class mstring : public string {

public:

    inline bool operator<(const string &s) const {

        string tmpa(*this);

        tmpa.append(s);

        string tmpb(s);

        tmpb.append(*this);

        return tmpa.compare(tmpb) < ;

    }

};

int main() {

    //#pragma warning(disable:4996)

    //freopen("..\\advanced-pat-python\\test.txt", "r", stdin);

    int N;

    cin >> N;

    set<mstring> nums;

    mstring ms;

    while (N--) {

        cin >> ms;

        nums.insert(ms);

    }

    mstring num;

    set<mstring>::iterator it = nums.begin();

    while (it!=nums.end()) {

        num += *(it++);

    }

    while (!num.empty() && *num.begin()=='') {

        num.erase(num.begin());

    }

    if (num.empty()) {

        num += '';

    }

    cout << num << endl;

}

总体来说还是较为简单的，但是没有Python那么爽的一行解决掉了。Python真是神奇的语言啊。

巴特西

PAT 1038 体验Python之美

1038. Recover the Smallest Number (30)

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