【算法题】按单词下标区间翻转文章内容

向右看齐 2024-03-27 09:09 29阅读 0赞

### [按单词下标区间翻转文章内容][Link 1] ###

![在这里插入图片描述][7ad346263f9649769624ea7715bb833d.png]

package array;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    
    public class FlipTheContent {
        
        public static void main(String[] args) throws IOException {
        
            BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
            List<String> words = Arrays.stream(bf.readLine().split(" ")).toList();
            int start = Integer.parseInt(bf.readLine());
            int end = Integer.parseInt(bf.readLine());
            bf.close();
    
            // 收集结果
            String resStr = "";
    
            // 越界直接返回
            if (start < 0 || start >= words.size() || end < 0 || end >= words.size() || start > end) {
        
                resStr = "EMPTY";
            } else {
        
                List<String> startList;
                if (start == 0) {
        
                    startList = new ArrayList<>();// 0对应元素给midList所以这里取不到
                } else {
        
                    startList = words.subList(0, start);
                }
    
                List<String> endList;
                if (end == words.size() - 1) {
        
                    endList = new ArrayList<>();// 最后一个元素给midList所以这里取不到
                } else {
        
                    endList = words.subList(end + 1, words.size());
                }
    
                List<String> midList = words.subList(start, end + 1);
    
                List<String> res = new ArrayList<>();
                res.addAll(startList);
                for (int i = midList.size() - 1; i >= 0; i--) {
        
                    res.add(midList.get(i));
                }
                res.addAll(endList);
                resStr = String.join(" ", res);
            }
            System.out.println(resStr);
        }
    }

[Link 1]: https://blog.csdn.net/cxh31627/article/details/125182142
[7ad346263f9649769624ea7715bb833d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/44dd590aab814de0892831b5f8512611.png