FZU 2111 Min Number

J - Min Number
Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u
Submit Status Practice FZU
2111

Description

Now you are given one non-negative integer n in 10-base notation, it will only contain digits ('0'-'9'). You are allowed to choose 2 integers i and j, such that: i!=j, 1≤i<j≤|n|, here |n| means the length of n’s 10-base notation. Then we can swap n[i] and
n[j].

For example, n=9012, we choose i=1, j=3, then we swap n[1] and n[3], then we get 1092, which is smaller than the original n.

Now you are allowed to operate at most M times, so what is the smallest number you can get after the operation(s)?

Please note that in this problem, leading zero is not allowed!

Input

The first line of the input contains an integer T (T≤100), indicating the number of test cases.

Then T cases, for any case, only 2 integers n and M (0≤n<10^1000, 0≤M≤100) in a single line.

Output

For each test case, output the minimum number we can get after no more than M operations.

Sample Input

39012 09012 19012 2

Sample Output

901210921029

题意：

找出最小的字符串，要求在交换的范围内；

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
int Min;

int main() {
int n;
string a;
int b;
int k;
int kase;
//scanf("%d",&n);
cin >> n;
while (n--) {
cin>>a;
cin>>b;
int len = a.length();
// cout << len;
kase = 0;
for (int i = 0; i < len; i++) {
if (kase >= b) break;
Min = '9' + 1; //记得要加上1
for (int j = len - 1; j >= i; j--) {
if(Min > a[j] && (a[j] != '0' || i)) {
Min = a[j];
k = j;
}
}
if (a[i] > a[k]) {
swap(a[i],a[k]);
++kase;
}

//if (kase >= b) break;
}
cout << a <<endl;
}
}