1038 Recover the Smallest Number

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 (≤104) 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. Notice that the first digit must not be zero.

Sample Input:

5 32 321 3214 0229 87

Sample Output:

22932132143287

代码长度限制

16 KB

时间限制

200 ms

内存限制

64 MB

代码

#include<iostream>
#include<vector>
#include<string>
#include<math.h>
#include<algorithm>
#include<stack>
using namespace std;
string s[10001];
**bool cmp(string a, string b)
{
    return a + b < b + a;
}**
int main(){
    int n;
    cin >> n;
    for(int i = 0; i < n; i ++)
    {
        cin >> s[i];
    }
    sort(s, s + n, cmp);
    string resstr;
    for(int i = 0; i < n; i++)
    {
        resstr += s[i];
    }
    while(resstr.length() != 0 && resstr[0] == '0')
    {
        **resstr.erase(resstr.begin());**
    }
    if(resstr.length() == 0) cout << 0;
    cout << resstr;
    return 0;
}

总结

这题的主要思路是从柳神那看的，果然很妙😄，主要在于cmp函数的应用和string的一些方法。

psogos