Reader和Scanner比较
BufferedReader是支持同步的,而Scanner不支持。BufferedReader的read函数都加了synchronized关键字
BufferedReader的缓冲区大小为8KB,Scanner的缓冲区大小为1KB
BufferedReader相对于Scanner来说要快一点,因为Scanner对输入数据进行正则解析,而BufferedReader只是简单地读取字符序列。
java解题代码:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) throws IOException {
Map<String, String> map = new HashMap<String, String>();
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(br.readLine());
for (int i = 0; i < n; ++i) {
String str = br.readLine();
String[] arr = str.split(" +");
map.put(arr[1], arr[0] + " " + arr[2]);
}
int t = Integer.parseInt(br.readLine());
String[] sarr = br.readLine().split(" +");
br.close();
for (int i = 0; i < t; ++i) {
System.out.println(map.get(sarr[i]));
}
}
}
如果用Scanner会超时,Scanner对输入数据进行正则解析,但是BufferedReader只是简单地读取字符序列。所以会过