题目解析
统计每天的借书次数和平均阅读时间
解题思路
用数组 t 去存储 这个书是否被借阅出去 并记录时间
当读到一个 S 时， 给 t 中对应id 附上时间
当读到一个 E 时， 判断 t 中对应 id 上有无数据
有就将当前的时间 - t 中的时间 加上时间 并 统计次数
没有就无需管这条数据
代码
import java.io.*;
import java.math.*;
import java.util.*;
public class Main
{
static int N = (int) 1e3;
static void solve()
{
int t[] = new int[N + 10];
Arrays.fill(t, -1);
int cnt = 0, times = 0;
while (sc.hasNext())
{
int id = sc.nextInt();
String op = sc.next();
String time[] = sc.next().split(":");
if (id == 0)
break;
int h = Integer.valueOf(time[0]);
int m = Integer.valueOf(time[1]);
int x = h * 60 + m;
if (op.equals("S"))
t[id] = x;
else
{
if (t[id] == -1)
continue;
cnt++;
times += x - t[id];
t[id] = -1;
}
}
if (cnt == 0)
out.println(0 + " " + 0);
else
out.println(cnt + " " + (int) (times * 1.0 / cnt + 0.5));
}
public static void main(String[] args) throws FileNotFoundException, InterruptedException
{
int n = sc.nextInt();
while (n-- > 0)
solve();
out.flush();
out.close();
}
static InputStream inputStream = System.in;
static InputReader sc = new InputReader(inputStream);
static PrintWriter out = new PrintWriter(System.out);
static class InputReader
{
public BufferedReader reader;
public StringTokenizer tokenizer;
public InputReader(InputStream stream)
{
reader = new BufferedReader(new InputStreamReader(stream), 32768);
tokenizer = null;
}
public String next()
{
while (tokenizer == null || !tokenizer.hasMoreTokens())
{
try
{
tokenizer = new StringTokenizer(reader.readLine());
} catch (IOException e)
{
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
boolean hasNext()
{
while (tokenizer == null || !tokenizer.hasMoreTokens())
{
try
{
tokenizer = new StringTokenizer(reader.readLine());
} catch (Exception e)
{
return false;
// TODO: handle exception
}
}
return true;
}
public int nextInt()
{
return Integer.parseInt(next());
}
}
}