Description
Pasha has a positive integer a without leading zeroes. Today he decided that the number is too small and he should make it larger. Unfortunately, the only operation Pasha can do is to swap two adjacent decimal digits of the integer.
Help Pasha count the maximum number he can get if he has the time to make at most k swaps.
Input
The single line contains two integers a and k(1 ≤ a ≤ 1018; 0 ≤ k ≤ 100).
Output
Print the maximum number that Pasha can get if he makes at most k swaps.
Sample Input
1990 1
9190
300 0
300
1034 2
3104
9090000078001234 6
9907000008001234
这道题是贪心的思想,在n步之内找到最大的数字,从后往前交换,交换一次n--;直到n为零;
#include <iostream>
#include <stdio.h>
#include <string.h>
char a[20];
int n;
using namespace std;
int main()
{
while(scanf("%s",&a)!=EOF)
{
scanf("%d",&n);
int len=strlen(a);
int npos,j;
for(int i=0;i<len;i++)
{
npos=i;
char ch=a[i];
for( j=i+1;j<=i+n&&j<len;j++)
{
if(a[j]>ch)
{
npos=j;
ch=a[j];
}
}
//cout<<npos;
if(npos!=i)
{
for(int p=npos;p>=i+1;p--)
{
char tem=a[p];
a[p]=a[p-1];
a[p-1]=tem;
n--;
}
}
if(!n) break;
}
for(int i=0;i<len;i++) cout<<a[i];
printf("\n");
}
return 0;
}