[SWEA] 2일차 - 최대상금

 

 

 

[문제]

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AV15Khn6AN0CFAYD

SW Expert Academy

 

 

 

[소스 코드]

import java.util.*;
import java.io.*;
public class Solution {
	static int max,result = 0;
	static char[] nums;
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
		int T = Integer.parseInt(br.readLine());
		for(int tc=1;tc<=T;tc++) {
			st = new StringTokenizer(br.readLine());
			String num = st.nextToken();
			nums = new char[num.length()];
			for(int i=0;i<num.length();i++) {
				nums[i] = num.charAt(i);
			}
			max = Integer.parseInt(st.nextToken());
			result = 0;
			dfs(0,0);
			System.out.println("#"+tc+" "+result);
		}
	}
	private static void dfs(int idx,int cnt) {
		if(cnt==max) {
			int number = Integer.valueOf(new String(nums));
			result = Math.max(result, number);
			return;
		}
		for(int i=idx;i<nums.length;i++) {
			for(int j=i+1;j<nums.length;j++) {
				swap(i,j);
				dfs(i,cnt+1);
				swap(j,i);
			}
		}
	}
	private static void swap(int i,int j) {
		char temp = nums[i];
		nums[i] = nums[j];
		nums[j] = temp;
	}
}