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问题描述
小明被不明势力劫持。后被扔到x星站再无问津。小明得知每天都有飞船飞往地球,但需要108元的船票,而他却身无分文。
他决定在x星战打工。好心的老板答应包食宿,第1天给他1元钱。
并且,以后的每一天都比前一天多2元钱,直到他有足够的钱买票。
请计算一下,小明在第几天就能凑够108元,返回地球。
答案提交
要求提交的是一个整数,表示第几天。请不要提交任何多余的内容。
11
calcCode:
public class Test {
public static void main(String[] args) {
int i = 1, num = 1, sum = 1;
while (sum < 108) {
sum += num += 2;
i++;
}
System.out.print(i);
}
}
简单模拟
问题描述
5只猴子是好朋友,在海边的椰子树上睡着了。这期间,有商船把一大堆香蕉忘记在沙滩上离去。
第1只猴子醒来,把香蕉均分成5堆,还剩下1个,就吃掉并把自己的一份藏起来继续睡觉。
第2只猴子醒来,重新把香蕉均分成5堆,还剩下2个,就吃掉并把自己的一份藏起来继续睡觉。
第3只猴子醒来,重新把香蕉均分成5堆,还剩下3个,就吃掉并把自己的一份藏起来继续睡觉。
第4只猴子醒来,重新把香蕉均分成5堆,还剩下4个,就吃掉并把自己的一份藏起来继续睡觉。
第5只猴子醒来,重新把香蕉均分成5堆,哈哈,正好不剩!
请计算一开始最少有多少个香蕉。
答案提交
需要提交的是一个整数,不要填写任何多余的内容。
3141
calcCode:
public class Test { public static void main(String[] args) { int i, n; for (i = n = 1; true; n = ++i) { if (n % 5 != 1) continue; n = n / 5 * 4; if (n % 5 != 2) continue; n = n / 5 * 4; if (n % 5 != 3) continue; n = n / 5 * 4; if (n % 5 != 4) continue; n = n / 5 * 4; if (n > 0 && n % 5 == 0) break; } System.out.print(i); } }
因为整形运算的结果只会保留整数部分,也就是向下取整,而题目中描述的常量都是对除数做的余数,根据Java运算符的结合顺序,这么写就完事了
不优雅,但实用
还是简单模拟
问题描述
仔细寻找,会发现:在下面的8x8的方阵中,隐藏着字母序列:“LANQIAO”。
SLANQIAO
ZOEXCCGB
MOAYWKHI
BCCIPLJQ
SLANQIAO
RSFWFNYA
XIFZVWAL
COAIQNAL
我们约定: 序列可以水平,垂直,或者是斜向;
并且走向不限(实际上就是有一共8种方向)。
上图中一共有4个满足要求的串。
下面有一个更大的(100x100)的字母方阵。
你能算出其中隐藏了多少个“LANQIAO”吗?
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答案提交
请提交一个整数,不要填写任何多余的内容。
41
calcCode:
import java.io.IOException; import java.io.InputStream; import java.io.FileInputStream; import java.util.ArrayDeque; import java.util.Deque; public class Test { public static void main(String[] args) throws IOException { char[] word = { 'L', 'A', 'N', 'Q', 'I', 'A', 'O' }; InputStream data = new FileInputStream("C:\\Users\\admin\\Desktop\\data.txt"); InputReader in = new InputReader(data); Deque<Integer> ns = new ArrayDeque(); Deque<Integer> ms = new ArrayDeque(); char[][] map = new char[100][100]; for (int i = 0; i < 100; i++) for (int j = 0; j < 100; j++) { map[i][j] = in.nextChar(); if (map[i][j] == 'L') { ns.push(i); ms.push(j); } } int[] nadd = { 1, -1, 0, 0, 1, 1, -1, -1}; int[] madd = { 0, 0, 1, -1, 1, -1, -1, 1}; int cnt = 0; while (!ns.isEmpty()) { int n = ns.pop(); int m = ms.pop(); int i, j, k, z = 8; while (z-- > 0) { for (k = 0, i = n, j = m; k < 7 && i >= 0 && i < 100 && j >= 0 && j < 100; k++, i += nadd[z], j += madd[z]) if (map[i][j] != word[k]) break; if (k == 7) cnt++; } } System.out.print(cnt); } static class InputReader { InputStream in; int next, len; byte[] buff; InputReader(InputStream in) { this(in, 8192); } InputReader(InputStream in, int buffSize) { this.buff = new byte[buffSize]; this.next = this.len = 0; this.in = in; } int getByte() { if (next >= len) try { next = 0; len = in.read(buff); if (len == -1) return -1; } catch (IOException e) { } return buff[next++]; } char nextChar() { int c = getByte(); while (c <= 32 || c == 127) c = getByte(); return (char)c; } } }
比较恶心的模拟
题目没读全,不过代码质量还行,就挂着吧
import java.io.IOException; import java.io.InputStream; import java.io.FileInputStream; public class Test { public static void main(String[] args) throws IOException { char[] word = { 'L', 'A', 'N', 'Q', 'I', 'A', 'O' }; InputStream data = new FileInputStream("C:\\Users\\admin\\Desktop\\data.txt"); InputReader in = new InputReader(data); int i = 0, c = 0, cnt = 0; while (-1 != (c = in.getByte())) { if (c <= 32 || c == 127) continue; if (i == 7) { i = 0; cnt++; } if (c == word[i]) i++; else i = 0; } System.out.print(cnt); } static class InputReader { . . . } }
问题描述
到x星球旅行的游客都被发给一个整数,作为游客编号。
x星的国王有个怪癖,他只喜欢数字3,5和7。
国王规定,游客的编号如果只含有因子:3,5,7,就可以获得一份奖品。
我们来看前10个幸运数字是:
3 5 7 9 15 21 25 27 35 45
因而第11个幸运数字是:49
小明领到了一个幸运数字 59084709587505,他去领奖的时候,人家要求他准确地说出这是第几个幸运数字,否则领不到奖品。
请你帮小明计算一下,59084709587505是第几个幸运数字。
答案提交
需要提交的是一个整数,请不要填写任何多余内容
1905
calcCode:
public class Test {
public static void main(String[] args) {
long n = 59084709587505L, cnt = 0;
for (long a = 1; a <= n; a *= 3)
for (long b = 1; b <= n; b *= 5)
for (long c = 1; c <= n; c *= 7)
if (a * b * c <= n && a * b * c > 0) cnt++;
System.out.print(cnt - 1);
}
}
因为记录了 1,而 1 不包含上述三个因子,因此要减去 1
a * b * c > 0
是比较溢出的值,小于 0 就是大于 Long.MAX_VALUE
,等同于大于 n
问题描述
2004年起,国际ISBN中心出版了《13位国际标准书号指南》。
原有10位书号前加978作为商品分类标识;校验规则也改变。
校验位的加权算法与10位ISBN的算法不同,具体算法是:
用1分别乘ISBN的前12位中的奇数位(从左边开始数起),用3乘以偶数位,乘积之和以10为模,10与模值的差值再对10取模(即取个位的数字)即可得到校验位的值,其值范围应该为0~9。
下面的程序实现了该算法,请仔细阅读源码,填写缺失的部分。
public class A { static boolean f(String s){ int k=1; int sum = 0; for(int i=0; i<s.length(); i++){ char c = s.charAt(i); if(c=='-' || c==' ') continue; sum += ______________________________; //填空 k++; if(k>12) break; } return s.charAt(s.length()-1)-'0' == (10-sum % 10)%10; } public static void main(String[] args){ System.out.println(f("978-7-301-04815-3")); System.out.println(f("978-7-115-38821-6")); } }
答案提交
注意:只提交空缺的代码,不要抄写已经存在的代码。
(c - ‘0’) * (1 == (k & 1)? 1: 3);
题目描述的很清晰,没啥好说的
问题描述
如下的程序目的是在控制台打印输出大X。
可以控制两个参数:图形的高度,以及笔宽。
用程序中的测试数据输出效果:
(如果显示有问题,可以参看p1.png)
高度=15, 笔宽=3
*** ***
*** ***
*** ***
*** ***
*** ***
*** ***
*****
***
*****
*** ***
*** ***
*** ***
*** ***
*** ***
*** ***
高度=8, 笔宽=5
***** *****
**********
********
******
******
********
**********
***** *****
public class A { static void f(int h, int w){ System.out.println(String.format("高度=%d, 笔宽=%d",h,w)); int a1 = 0; int a2 = h - 1; for(int k=0; k<h; k++){ int p = Math.min(a1,a2); int q = Math.max(a1+w,a2+w); for(int i=0; i<p; i++) System.out.print(" "); if(q-p<w*2){ ____________________________________________ ; //填空 } else{ for(int i=0; i<w; i++) System.out.print("*"); for(int i=0; i<q-p-w*2; i++) System.out.print(" "); for(int i=0; i<w; i++) System.out.print("*"); } System.out.println(); a1++; a2--; } } public static void main(String[] args){ f(15,3); f(8,5); } }
答案提交
注意:只填写缺失的代码,不要拷贝已经存在的代码。
while (p++ < q) System.out.print("*");
p,q 代表当前行起始和结束的位置,当 q - p < w * 2
时,代表撇捺已经重合,行开始的缩紧在前面的代码中已经完成了,所以直接循环打印就行
问题描述
在电子计算机普及以前,人们经常用一个粗略的方法来验算四则运算是否正确。
比如:248 * 15 = 3720
把乘数和被乘数分别逐位求和,如果是多位数再逐位求和,直到是1位数,得
2 + 4 + 8 = 14 ==> 1 + 4 = 5;
1 + 5 = 6
5 * 6
而结果逐位求和为 3
5 * 6 的结果逐位求和与3符合,说明正确的可能性很大!!(不能排除错误)
请你写一个计算机程序,对给定的字符串逐位求和
资源约定
峰值内存消耗(含虚拟机) < 256M
CPU消耗 < 1000ms
输入格式
输入为一个由数字组成的串,表示n位数(n<1000);
输出格式
输出为一位数,表示反复逐位求和的结果。
测试样例1
Input:
35379
Output:
9
测试样例2
Input:
7583676109608471656473500295825
Output:
1
code:
import java.io.*; public class Main { public static void main(String[] args) throws IOException { byte[] buff = new byte[1024]; int len = System.in.read(buff); int[] a = new int[len]; for (int i = 0; i < len; i++) a[i] = byteToValue(buff[i]); while (len > 1) { for (int i = 1; i < len; i++) a[0] += a[i]; for (int i = 0, pre = a[0]; pre != 0; len = ++i) { a[i] = pre % 10; pre /= 10; } } System.out.print(a[0]); } static int byteToValue(byte n) { return n > '0' && n < '9'? n & 0xf: 0; } }
一定程度上可以归类为高精度,没啥好说的
问题描述
本题目要求你在控制台输出一个由数字组成的等腰三角形。
具体的步骤是:
1
2 1
3 8
4 1
5 7
6 1
7 6
891011121314151
显示不正确时,参看:p1.png
资源约定
峰值内存消耗(含虚拟机) < 256M
CPU消耗 < 1000ms
输入格式
一个正整数n(3<n<300),表示三角形的高度
为了便于测评,我们要求空格一律用"."代替。
输出格式
用数字填充的等腰三角形。
测试样例1
Input:
5
Output:
....1
...2.1
..3...2
.4.....1
567891011
测试样例2
Input:
10
Output:
.........1
........2.2
.......3...2
......4.....2
.....5.......1
....6.........2
...7...........0
..8.............2
.9...............9
1011121314151617181
测试样例3
Input: 15 Output: ..............1 .............2.3 ............3...2 ...........4.....3 ..........5.......1 .........6.........3 ........7...........0 .......8.............3 ......9...............9 .....1.................2 ....0...................8 ...1.....................2 ..1.......................7 .1.........................2 21314151617181920212223242526
n < 300
也就是数字串长度不超过 600,可以先打个表
想用 js 打表,但怕犯规
import java.math.BigInteger;
public class Test {
public static void main(String[] args) {
BigInteger n = BigInteger.ZERO;
StringBuilder table = new StringBuilder();
while (table.length() < 600)
table.append(n = n.add(BigInteger.ONE));
for (char i: table.toString().toCharArray())
System.out.print((byte)i + ", ");
}
}
code:
import java.io.*; public class Main { static final byte[] table = { 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, 51, 49, 52, 49, 53, 49, 54, 49, 55, 49, 56, 49, 57, 50, 48, 50, 49, 50, 50, 50, 51, 50, 52, 50, 53, 50, 54, 50, 55, 50, 56, 50, 57, 51, 48, 51, 49, 51, 50, 51, 51, 51, 52, 51, 53, 51, 54, 51, 55, 51, 56, 51, 57, 52, 48, 52, 49, 52, 50, 52, 51, 52, 52, 52, 53, 52, 54, 52, 55, 52, 56, 52, 57, 53, 48, 53, 49, 53, 50, 53, 51, 53, 52, 53, 53, 53, 54, 53, 55, 53, 56, 53, 57, 54, 48, 54, 49, 54, 50, 54, 51, 54, 52, 54, 53, 54, 54, 54, 55, 54, 56, 54, 57, 55, 48, 55, 49, 55, 50, 55, 51, 55, 52, 55, 53, 55, 54, 55, 55, 55, 56, 55, 57, 56, 48, 56, 49, 56, 50, 56, 51, 56, 52, 56, 53, 56, 54, 56, 55, 56, 56, 56, 57, 57, 48, 57, 49, 57, 50, 57, 51, 57, 52, 57, 53, 57, 54, 57, 55, 57, 56, 57, 57, 49, 48, 48, 49, 48, 49, 49, 48, 50, 49, 48, 51, 49, 48, 52, 49, 48, 53, 49, 48, 54, 49, 48, 55, 49, 48, 56, 49, 48, 57, 49, 49, 48, 49, 49, 49, 49, 49, 50, 49, 49, 51, 49, 49, 52, 49, 49, 53, 49, 49, 54, 49, 49, 55, 49, 49, 56, 49, 49, 57, 49, 50, 48, 49, 50, 49, 49, 50, 50, 49, 50, 51, 49, 50, 52, 49, 50, 53, 49, 50, 54, 49, 50, 55, 49, 50, 56, 49, 50, 57, 49, 51, 48, 49, 51, 49, 49, 51, 50, 49, 51, 51, 49, 51, 52, 49, 51, 53, 49, 51, 54, 49, 51, 55, 49, 51, 56, 49, 51, 57, 49, 52, 48, 49, 52, 49, 49, 52, 50, 49, 52, 51, 49, 52, 52, 49, 52, 53, 49, 52, 54, 49, 52, 55, 49, 52, 56, 49, 52, 57, 49, 53, 48, 49, 53, 49, 49, 53, 50, 49, 53, 51, 49, 53, 52, 49, 53, 53, 49, 53, 54, 49, 53, 55, 49, 53, 56, 49, 53, 57, 49, 54, 48, 49, 54, 49, 49, 54, 50, 49, 54, 51, 49, 54, 52, 49, 54, 53, 49, 54, 54, 49, 54, 55, 49, 54, 56, 49, 54, 57, 49, 55, 48, 49, 55, 49, 49, 55, 50, 49, 55, 51, 49, 55, 52, 49, 55, 53, 49, 55, 54, 49, 55, 55, 49, 55, 56, 49, 55, 57, 49, 56, 48, 49, 56, 49, 49, 56, 50, 49, 56, 51, 49, 56, 52, 49, 56, 53, 49, 56, 54, 49, 56, 55, 49, 56, 56, 49, 56, 57, 49, 57, 48, 49, 57, 49, 49, 57, 50, 49, 57, 51, 49, 57, 52, 49, 57, 53, 49, 57, 54, 49, 57, 55, 49, 57, 56, 49, 57, 57, 50, 48, 48, 50, 48, 49, 50, 48, 50, 50, 48, 51, 50, 48, 52, 50, 48, 53, 50, 48, 54, 50, 48, 55, 50, 48, 56, 50, 48, 57, 50, 49, 48, 50, 49, 49, 50, 49, 50, 50, 49, 51, 50, 49, 52, 50, 49, 53, 50, 49, 54, 50, 49, 55, 50, 49, 56, 50, 49, 57, 50, 50, 48, 50, 50, 49, 50, 50, 50, 50, 50, 51, 50, 50, 52, 50, 50, 53, 50, 50, 54, 50, 50, 55, 50, 50, 56, 50, 50, 57, 50, 51, 48, 50, 51, 49, 50, 51, 50, 50, 51, 51, 50, 51, 52, 50, 51, 53, 50, 51, 54 }; public static void main(String[] args) throws IOException { int n = nextInt(System.in); PrintStream out = System.out; int start = 0, end = n * 4 - 6, left = n - 2, space = 1; for (int i = 0; i <= left; i++) out.write(46); out.print("1\n"); while (left > 0) { for (int i = 0; i < left; i++) out.write(46); out.write(table[start]); for (int i = 0; i < space; i++) out.write(46); out.write(table[end]); out.write('\n'); space+=2; start++; left--; end--; } out.write(table, start, n * 2 - 1); } static int nextInt(InputStream in) throws IOException { int n = 0, c = in.read(); while (c < '0' || c > '9') c = in.read(); while (c >='0' && c <='9') { n = n * 10 + (c & 0xf); c = in.read(); } return n; } }
写着写着就成找规律了
问题描述
班里N个小朋友,每个人都有自己最崇拜的一个小朋友(也可以是自己)。
在一个游戏中,需要小朋友坐一个圈,
每个小朋友都有自己最崇拜的小朋友在他的右手边。
求满足条件的圈最大多少人?
小朋友编号为1,2,3,…N
资源约定
峰值内存消耗(含虚拟机) < 256M
CPU消耗 < 1000ms
输入格式
输入第一行,一个整数N(3<N<100000)
接下来一行N个整数,由空格分开。
输出格式
要求输出一个整数,表示满足条件的最大圈的人数。
测试样例1
Input:
9
3 4 2 5 3 8 4 6 9
Output:
4
Explanation:
如图p1.png所示,崇拜关系用箭头表示,红色表示不在圈中。
显然,最大圈是[2 4 5 3] 构成的圈
测试样例2
Input:
30
22 28 16 6 27 21 30 1 29 10 9 14 24 11 7 2 8 5 26 4 12 3 25 18 20 19 23 17 13 15
Output:
16
code:
import java.io.*; import java.util.Arrays; import java.util.StringTokenizer; public class Main { public static void main(String[] args) throws IOException { InputReader in = new InputReader(System.in, " \n"); int n = in.nextInt(), res = 0; int[] link = new int[n + 1]; boolean[] marked = new boolean[n + 1]; Arrays.fill(marked, true); for (int i = 1; i <= n; i++) marked[link[i] = in.nextInt()] = false; for (int i = 1, start, end, cnt; i <= n; i++) { if (marked[i]) continue; start = end = i; cnt = 1; while (link[start] != end) { marked[start] = true; start = link[start]; cnt++; } if (cnt > res) res = cnt; } System.out.print(res); } static class InputReader { BufferedReader read; StringTokenizer tok; String delimiters; InputReader(InputStream in) { this(in, " \n\r\t\f"); } InputReader(InputStream in, String delimiters) { this.read = new BufferedReader(new InputStreamReader(in)); this.tok = new StringTokenizer("", this.delimiters = delimiters); } String next() { while (!tok.hasMoreTokens()) try { tok = new StringTokenizer(read.readLine(), delimiters); } catch (IOException e) { } return tok.nextToken(); } int nextInt() { return Integer.parseInt(next()); } } }
排除掉入度为 0 的顶点,图里就只剩环了,接下来慢慢跑大小就行
就是不知道我这个想法对不对,有没有大哥讲下的
问题描述
x星球的居民脾气不太好,但好在他们生气的时候唯一的异常举动是:摔手机。
各大厂商也就纷纷推出各种耐摔型手机。x星球的质监局规定了手机必须经过耐摔测试,并且评定出一个耐摔指数来,之后才允许上市流通。
x星球有很多高耸入云的高塔,刚好可以用来做耐摔测试。塔的每一层高度都是一样的,与地球上稍有不同的是,他们的第一层不是地面,而是相当于我们的2楼。
如果手机从第7层扔下去没摔坏,但第8层摔坏了,则手机耐摔指数=7。
特别地,如果手机从第1层扔下去就坏了,则耐摔指数=0。
如果到了塔的最高层第n层扔没摔坏,则耐摔指数=n
为了减少测试次数,从每个厂家抽样3部手机参加测试。
如果已知了测试塔的高度,并且采用最佳策略,在最坏的运气下最多需要测试多少次才能确定手机的耐摔指数呢?
资源约定
峰值内存消耗(含虚拟机) < 256M
CPU消耗 < 1000ms
输入格式
一个整数n(3<n<10000),表示测试塔的高度。
输出格式
输出一个整数,表示最多测试多少次。
测试样例1
Input:
3
Output:
2
Explanation:
手机a从2楼扔下去,坏了,就把b手机从1楼扔;否则a手机继续3层扔下
测试样例2
Input:
7
Output:
3
Explanation:
a手机从4层扔,坏了,则下面有3层,b,c 两部手机2次足可以测出指数;
若是没坏,手机充足,上面5,6,7 三层2次也容易测出。
code:
import java.io.*; public class Main { public static void main(String[] args) throws IOException { int n = nextInt(System.in); int[][] dp = new int[3][n + 1]; for (int i = 1; i <= n; i++) dp[0][i] = i; for (int k = 1; k < 3; k++) { for (int i = 1; i <= n; i++) { dp[k][i] = dp[k][i - 1] + 1; for (int j = 1; j < i; j++) dp[k][i] = min(dp[k][i], max(dp[k - 1][j - 1], dp[k][i - j]) + 1); } } System.out.print(dp[2][n]); } static int min(int a, int b) { return a < b? a: b; } static int max(int a, int b) { return a > b? a: b; } static int nextInt(InputStream in) throws IOException { int n = 0, c = in.read(); while (c < '0' || c > '9') c = in.read(); while (c >='0' && c <='9') { n = n * 10 + (c & 0xf); c = in.read(); } return n; } }
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