Description:
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
22932132143287
//NKW 甲级真题1049
#pragma warning(disable:4996)
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
const int maxn = 10010;
string num[maxn], result;
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 >> num[i];
sort(num, num + n, cmp);
for (int i = 0; i < n;i++)
result += num[i];
while (result.length() != 0 && result[0] == '0')
result.erase(result.begin());
if (result.length() == 0)
cout << 0;
cout << result << endl;
system("pause");
return 0;
}
对于string的操作最好用cin,cout