1038 Recover the Smallest Number (30 分)
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
呃呃呃呃呃以前写过,但是感觉自己还是不开窍 直接比较字符串a+b和b+a哪个比较小即可
代码:
#include<bits/stdc++.h>
using namespace std;
vector<string>vec;
bool cmp(string a, string b){
return a + b < b + a;
}
int main()
{
int n;
scanf("%d", &n);
char str[10];
for(int i = 0 ; i < n ; i ++)
{
scanf("%s",str);
vec.push_back(str);
}
sort(vec.begin(), vec.end(), cmp);
string s = "",t = "";
for(int i = 0 ; i < vec.size(); i ++)
s += vec[i];
while(s.empty() == 0 && s.at(0) == '0')
s.replace(0,1,"");
if(s.empty() == true)
cout<<0<<endl;
else
cout<<s<<endl;
return 0;
}