USACO Buy Low, Buy Lower

Code

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/*
ID: wcr19961
PROG: buylow
LANG: JAVA
*/
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;
import java.util.Random;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.math.*;
import java.util.*;
public class buylow {
public static void main(String[] args) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream("buylow.in");
OutputStream outputStream = new PrintStream("buylow.out");
InputReader in = new InputReader(inputStream);
PrintWriter out = new PrintWriter(outputStream);
Slover slove = new Slover();
slove.slove(in, out);
out.close();
} catch (FileNotFoundException ex) {
Logger.getLogger(buylow.class.getName()).log(Level.SEVERE, null, ex);
}
}
static class Slover {
public void slove(InputReader in, PrintWriter out) {
int n = in.nextInt();
int[] a = new int[n + 2];
int[] len = new int[n + 2];
BigInteger[] dp = new BigInteger[n + 2];
for (int i = 1; i <= n; ++i) {
a[i] = in.nextInt();
len[i] = 1;
dp[i] = BigInteger.ONE;
}
dp[n + 1] = BigInteger.ONE;
++n;
int ans = 0;
for (int i = 2; i <= n; ++i) {
TreeSet<Integer> S = new TreeSet<Integer> ();
for (int j = i - 1; j > 0; --j) {
if (a[i] < a[j] && len[i] <= len[j] + 1) {
if (len[i] < len[j] + 1) {
len[i] = len[j] + 1;
dp[i] = dp[j];
if (len[i] > len[ans]) {
ans = i;
}
} else if (!S.contains(a[j])) {
dp[i] = dp[i].add(dp[j]);
}
S.add(a[j]);
}
}
}
out.println(len[ans] - 1 + " " + dp[ans]);
out.flush();
}
}
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();
}
public boolean hasNext() {
try {
return reader.ready();
} catch (IOException ex) {
Logger.getLogger(buylow.class.getName()).log(Level.SEVERE, null, ex);
}
return false;
}
public long nextLong() {
return Long.parseLong(next());
}
public int nextInt() {
return Integer.parseInt(next());
}
public double nextDouble() {
return Double.parseDouble(next());
}
}
}

支付宝扫码领红包