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SRM 147 CCipher

edwing — Sun, 05 Apr 2009 12:09:00 GMT

1import java.lang.*;
2import java.util.*;
3
4public class CCipher {
5    public String decode(String cipherText, int shift) {
6
7        StringBuffer ans = new StringBuffer();
8        for (int i = 0; i < cipherText.length(); ++i) {
9            char ch = cipherText.charAt(i);
10            if (ch - 'A' - shift < 0) {
11                ch += 26 - shift;
12            } else {
13                ch -= shift;
14            }
15            ans.append(ch);
16        }
17        return ans.toString();
18
19    }
20}

edwing 2009-04-05 20:09 发表评论

SRM 149 FormatAmt

edwing — Sun, 05 Apr 2009 12:07:00 GMT

1import java.util.*;
2import java.lang.*;
3
4public class FormatAmt {
5
6    public String amount(int dollars, int cents) {
7
8        String ans = "";
9        String dollarsStr = String.valueOf(dollars);
10        int n = dollarsStr.length();
11        int begin = (3 - (n % 3)) % 3;
12        for (int i = 0, j = begin; i < n; ++i, j = (++j) % 3) {
13            if (i != 0 && j == 0) {
14                ans += ",";
15            }
16            ans += dollarsStr.charAt(i);
17        }
18        ans = "$" + ans + ".";
19        if (cents < 10) {
20            ans += "0" + cents;
21        } else {
22            ans += cents;
23        }
24        return ans;
25
26    }
27
28}

edwing 2009-04-05 20:07 发表评论

SRM 148 DivisorDigits

edwing — Sat, 21 Mar 2009 02:27:00 GMT

1import java.util.*;
2import java.lang.*;
3
4public class DivisorDigits {
5    public int howMany(int number) {
6
7        int ans = 0;
8        int n = number;
9        while (n != 0) {
10            int n1 = n % 10;
11            if (n1 != 0 && number % n1 == 0) {
12                ++ans;
13            }
14            n /= 10;
15        }
16        return ans;
17
18    }
19}

edwing 2009-03-21 10:27 发表评论

SRM 145 ImageDithering

edwing — Sat, 21 Mar 2009 02:21:00 GMT

1import java.util.*;
2
3public class ImageDithering {
4    public int count(String dithered, String[] screen) {
5        int ans = 0;
6        for (int i = 0; i < screen.length; ++i) {
7            for (int j = 0; j < screen[0].length(); ++j) {
8                char ch = screen[i].charAt(j);
9                if (dithered.indexOf(ch) != -1) {
10                    ++ans;
11                }
12            }
13        }
14        return ans;
15    }
16}

edwing 2009-03-21 10:21 发表评论

SRM 144 Time

edwing — Sat, 21 Mar 2009 02:17:00 GMT

1public class Time {
2    public String whatTime(int seconds) {
3        int h = seconds / 3600;
4        int m = seconds / 60 % 60;
5        int s = seconds % 60;
6        return (h + ":" + m + ":" + s);
7    }
8}

edwing 2009-03-21 10:17 发表评论