第十一届蓝桥杯省赛第二场Java C组解题思路与代码分享 - Cache One

试题 A: 约数个数

本题总分: 5
【问题描述】
对于一个整数,能整除这个整数的数称为这个数的约数。
例如: 1 , 2 , 3 , 6 都是 6 的约数。
请问 78120 有多少个约数。
【答案提交】
这是一道结果填空的题,你只需要算出结果后提交即可。本题的结果为一
个整数,在提交答案时只填写这个整数,填写多余的内容将无法得分。
 
这个题直接用for循环就可以完美解题了  答案 96
package 第十一届C;

public class T1 {
	public static void main(String[] args) {
		int k = 78120;
		int sum = 0;
		for (int i = 1; i <= k; i++) {
			if (k%i==0) {
				sum++;
			}
		}
		System.out.println(sum);
	}

}

试题 B: 寻找 2020

本题总分: 5
【问题描述】
小蓝有一个数字矩阵,里面只包含数字 0 2 。小蓝很喜欢 2020 ,他想找
到这个数字矩阵中有多少个 2020
小蓝只关注三种构成 2020 的方式:
同一行里面连续四个字符从左到右构成 2020
同一列里面连续四个字符从上到下构成 2020
在一条从左上到右下的斜线上连续四个字符,从左上到右下构成 2020
例如,对于下面的矩阵:
220000
000000
002202
000000
000022
002020
一共有 5 2020 。其中 1 个是在同一行里的, 1 个是在同一列里的, 3
是斜线上的。
小蓝的矩阵比上面的矩阵要大,由于太大了,他只好将这个矩阵放在了一
个文件里面,在试题目录下有一个文件 2020.txt ,里面给出了小蓝的矩阵。
请帮助小蓝确定在他的矩阵中有多少个 2020
【答案提交】
这是一道结果填空的题,你只需要算出结果后提交即可。本题的结果为一
个整数,在提交答案时只填写这个整数,填写多余的内容将无法得分。
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这道题的思路和官网的某道题  寻找lanqiao的那个题一样  这个就是寻找2020  思路就是循环遍历数组  找到一个2之后停住  向三个方向开始寻找有没有020  

答案是 16520

代码是去年的思路  这几天看到都在使用方向移动数组做方向的题  可以减少一定的代码量  也是一个不错的东西
package 第十一届C;

import java.util.Scanner;

public class T2 {
	public static void main(String[] args) {
		char [][] aa = new char[300][300];
		Scanner sc = new Scanner(System.in);
		for (int i = 0; i < aa.length; i++) {
			aa[i] = sc.nextLine().toCharArray();
		}
		char [] c = new char[]{'2','0','2','0'};
		sc.close();
		int sum = 0;
		for (int i = 0; i < aa.length; i++) {
			for (int j = 0; j < aa[i].length; j++) {
				if (aa[i][j] == '2') {
					int temp = 1;
					for (int k = 1; k + j < aa.length && k < 4; k++) {
						if (aa[i][j+k] == c[k]) {
							temp++;
						}
					}
					if (temp == 4) {
						sum++;
					}
					temp = 1;
					for (int k = 1; k + i < aa.length && k < 4; k++) {
						if (aa[i+k][j] == c[k]) {
							temp++;
						}
					}
					if (temp == 4) {
						sum++;
					}
					temp = 1;
					for (int k = 1; k + j < aa.length&&k + i < aa.length && k < 4; k++) {
						if (aa[i+k][j+k] == c[k]) {
							temp++;
						}
					}
					if (temp == 4) {
						sum++;
					}
				}
			}
		}
		System.out.println(sum);
	}

}

试题 C: 跑步锻炼

本题总分: 10
【问题描述】
小蓝每天都锻炼身体。
正常情况下,小蓝每天跑 1 千米。如果某天是周一或者月初( 1 日),为了
激励自己,小蓝要跑 2 千米。如果同时是周一或月初,小蓝也是跑 2 千米。
小蓝跑步已经坚持了很长时间,从 2000 1 1 日周六(含)到 2020
10 1 日周四(含)。请问这段时间小蓝总共跑步多少千米?
【答案提交】
这是一道结果填空的题,你只需要算出结果后提交即可。本题的结果为一
个整数,在提交答案时只填写这个整数,填写多余的内容将无法得分。
 
这个小蓝可是真的能跑哈  跑了20多年  去年参赛的时候  不太会用Calendar 这个类  写了一大堆代码  去模拟日期的增长  费时费力  但是  结果是对的  就很棒哈
这次参加的时候学了java的日期类 利用一些方法就可以的到我想要的东西  还不用判断日期的合法性  简直不要太省事了   下面的代码是循环进行日期的模拟  利用calendar进行日期合法性的判断  在返回星期几和月第几天  进行判断  在下面的代码是利用calender进行日期的自增 还可以省略一大堆代码  每增加一天  他会自动进行年月日的增加  方便
答案是8879

我写的代码

package 第十一届C;

import java.util.Calendar;

public class T3 {
	public static void main(String[] args) {
		int sum = 0;
		Calendar cal = Calendar.getInstance();
		cal.clear();
		aa:for (int i = 2000; i < 2021; i++) {
			for (int j = 0; j < 12; j++) {
				cal.clear();
				cal.set(Calendar.YEAR, i);
				cal.set(Calendar.MONTH,j);
				//System.out.println(cal.getActualMaximum(Calendar.DAY_OF_MONTH));
				for (int k = 1; k <= cal.getActualMaximum(Calendar.DAY_OF_MONTH); k++) {
					if (i==2020&&j==9&&k==2) {
						break aa;
					}else {
					cal.set(Calendar.DAY_OF_MONTH,k);
					//System.out.println(cal.get(Calendar.YEAR)+","+cal.get(Calendar.MONTH)+","+cal.get(Calendar.DAY_OF_MONTH)+","+cal.get(Calendar.DAY_OF_WEEK));
					if (cal.get(Calendar.DAY_OF_MONTH )==1 ||cal.get(Calendar.DAY_OF_WEEK)==2) {
						sum += 2;
					}else {
						sum++;
					}
					}
				}
			}
		}
		System.out.println(sum);
	}
}

另外一个哥们写的代码

package 第十一届C;

import java.util.Calendar;

public class T3方法2 {

	public static void main(String[] args) {
		Calendar cl= Calendar.getInstance();
		cl.set(Calendar.YEAR, 2000);
		cl.set(Calendar.MONTH, 0);//减一的
		cl.set(Calendar.DAY_OF_MONTH, 1);
		int sum=2;
		for (;;) {
			cl.add(Calendar.DAY_OF_MONTH,1);
			int zhou=cl.get(Calendar.DAY_OF_WEEK)-1;//周几(不考虑周日)
			int ri=cl.get(Calendar.DAY_OF_MONTH);//月几号
			if (cl.get(Calendar.YEAR)==2020&&cl.get(Calendar.MONTH)==9&&ri==2) {//最后一天					
				break;
			}
			else {
				if (zhou==1||ri==1) {//如果是周一或者月初加2
					sum+=2;
				}
				else {
					sum++;
				}
			}						
		}
		System.out.println(sum);
	}

}

试题 D: 平面分割

本题总分: 10
【问题描述】
20 个圆和 20 条直线最多能把平面分成多少个部分?
【答案提交】
这是一道结果填空的题,你只需要算出结果后提交即可。本题的结果为一
个整数,在提交答案时只填写这个整数,填写多余的内容将无法得分
 
看到这个题  我哭了啊  这是个啥啊  我记得那天考试结束是13.00  结束之后就发现知乎上有人发帖再问这个东西 结果没答案  在群里有人说  当时不会  我就把我的准考证号输进去了  碰个运气  嘿嘿
当然 后来有人说这个题是用交点去做  就比如两个圆放到一起  有两个交点 四个平面啥的
算了 附上链接把

https://www.zhihu.com/question/426034179

试题 E: 七段码

本题总分: 15
【问题描述】
小蓝要用七段码数码管来表示一种特殊的文字。
上图给出了七段码数码管的一个图示,数码管中一共有 7 段可以发光的二
极管,分别标记为 a, b, c, d, e, f, g
小蓝要选择一部分二极管(至少要有一个)发光来表达字符。在设计字符
的表达时,要求所有发光的二极管是连成一片的。
例如: b 发光,其他二极管不发光可以用来表达一种字符。
例如: c 发光,其他二极管不发光可以用来表达一种字符。这种方案与上
一行的方案可以用来表示不同的字符,尽管看上去比较相似。
例如: a, b, c, d, e 发光, f, g 不发光可以用来表达一种字符。
例如: b, f 发光,其他二极管不发光则不能用来表达一种字符,因为发光
的二极管没有连成一片。
请问,小蓝可以用七段码数码管表达多少种不同的字符?
【答案提交】
这是一道结果填空的题,你只需要算出结果后提交即可。本题的结果为一
个整数,在提交答案时只填写这个整数,填写多余的内容将无法得分。

这个题考试的时候一想  七个for循环  循环每个灯亮或者不亮  在判断  是不是连接成一片的  方法是记录亮着
的灯  然后循环这个灯如果亮的话  就去找他旁边的灯有没有亮的  如果有就代表他不孤单 最后判断每个灯都不
孤单 就代表它是一种合法的  得到84  去掉全灭是83  而答案是80  为啥呢  就是 ab和de亮  cd和fa  bc和
fe  每次循环到灯的时候都判断到ab或者ed是连到一起的  但是他们整体不是连成一片的 所以 哎~~~  都是眼
泪啊  现在的思路还是循环每一个二极管  记录一下  再用搜索查找与第一个灯连着的所有灯  判断每一个灯是
不是访问过 都访问过就代表是一种情况了  
结果是 80
package 第十一届C;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Queue;

public class T5 {
	public static int[][]aa = {
			{0,1,0,0,0,1,0},
			{1,0,1,0,0,0,1},
			{0,1,0,1,0,0,1},
			{0,0,1,0,1,0,0},
			{0,0,0,1,0,1,1},
			{1,0,0,0,1,0,1},
			{0,1,1,0,1,1,0},
	};
public static void main(String[] args) {
	Queue<Integer> que = new LinkedList<Integer>();
	int sum = 0;
	for (int a = 0; a < 2; a++) {
		for (int b = 0; b < 2; b++) {
			for (int c = 0; c < 2; c++) {
				for (int d = 0; d < 2; d++) {
					for (int e = 0; e < 2; e++) {
						for (int f = 0; f < 2; f++) {
							kk:for (int g = 0; g < 2; g++) {
								ArrayList<Character> arr = new ArrayList<Character>();
								if (a==1) {
									arr.add('a');
								}
								if (b==1) {
									arr.add('b');
								}
								if (c==1) {
									arr.add('c');
								}
								if (d==1) {
									arr.add('d');
								}
								if (e==1) {
									arr.add('e');
								}
								if (f==1) {
									arr.add('f');
								}
								if (g==1) {
									arr.add('g');
								}
								if (arr.size()>0) {
									boolean[] bb = new boolean[arr.size()];
									que.add((int)(arr.get(0)-'a'));
									bb[0] = true;
									while (!que.isEmpty()) {
										int temp = que.poll();
										for (int i = 0; i < aa[temp].length; i++) {
											if (aa[temp][i] == 1 && arr.indexOf((char)(i+'a'))!=-1&&!bb[arr.indexOf((char)(i+'a'))]) {
												que.add((int)(arr.get(arr.indexOf((char)(i+'a')))-'a'));
												bb[arr.indexOf((char)(i+'a'))] = true;
											}
										}
									}
									for (int i = 0; i < bb.length; i++) {
										if (!bb[i]) {
											continue kk;
										}
									}
									sum++;
								}
							}
						}
					}
				}
			}
		}
	}

	System.out.println(sum); //广搜的方法做就不需要考虑对角和对边的状态
}

}

这是之前的  思路 结果是错的  只是因为那个ab和de亮  cd和fa  bc和fe情况

package 第十一届C;

import java.util.ArrayList;
import java.util.LinkedList;

public class T5 {
public static void main(String[] args) {
	Queue<Integer> que = new LinkedList<Integer>();
	int sum = 0;
	for (int a = 0; a < 2; a++) {
		for (int b = 0; b < 2; b++) {
			for (int c = 0; c < 2; c++) {
				for (int d = 0; d < 2; d++) {
					for (int e = 0; e < 2; e++) {
						for (int f = 0; f < 2; f++) {
							kk:for (int g = 0; g < 2; g++) {
								ArrayList<Character> arr = new ArrayList<Character>();
								if (a==1) {
									arr.add('a');
								}
								if (b==1) {
									arr.add('b');
								}
								if (c==1) {
									arr.add('c');
								}
								if (d==1) {
									arr.add('d');
								}
								if (e==1) {
									arr.add('e');
								}
								if (f==1) {
									arr.add('f');
								}
								if (g==1) {
									arr.add('g');
								}
								int temp = 0;
								for (int i = 0; i < arr.size(); i++) {
									if (arr.get(i)=='a') {
										if (arr.indexOf('b')!=-1||arr.indexOf('f')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='b') {
										if (arr.indexOf('a')!=-1||arr.indexOf('c')!=-1||arr.indexOf('g')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='c') {
										if (arr.indexOf('b')!=-1||arr.indexOf('g')!=-1||arr.indexOf('d')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='d') {
										if (arr.indexOf('c')!=-1||arr.indexOf('e')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='e') {
										if (arr.indexOf('d')!=-1||arr.indexOf('g')!=-1||arr.indexOf('f')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='f') {
										if (arr.indexOf('a')!=-1||arr.indexOf('g')!=-1||arr.indexOf('e')!=-1) {
											temp++;
										}
									}
									if (arr.get(i)=='g') {
										if (arr.indexOf('b')!=-1||arr.indexOf('f')!=-1||arr.indexOf('e')!=-1||arr.indexOf('c')!=-1) {
											temp++;
										}
									}
								}
								if (temp == arr.size()) {
									sum++;
									System.out.println(arr);
								}
								if (arr.size()==1) {//只有一个灯亮的时候上面的办法就不行了  但也是一种情况
									sum++;
									System.out.println(arr);
								}

							}
						}
					}
				}
			}
		}
	}
	System.out.println(sum-4); //去掉全灭的情况  以及abde四个亮  以及acdf四个亮  以及bcef四个亮
}

}

试题 F: 成绩统计

时间限制 : 1.0s
内存限制 : 512.0MB
本题总分: 15
【问题描述】
小蓝给学生们组织了一场考试,卷面总分为
100 分,每个学生的得分都是
一个 0 100 的整数。
如果得分至少是 60 分,则称为及格。如果得分至少为 85 分,则称为优秀。
请计算及格率和优秀率,用百分数表示,百分号前的部分四舍五入保留整
数。
【输入格式】
输入的第一行包含一个整数 n ,表示考试人数。
接下来 n 行,每行包含一个 0 100 的整数,表示一个学生的得分。
【输出格式】
输出两行,每行一个百分数,分别表示及格率和优秀率。百分号前的部分
四舍五入保留整数。
【样例输入】
7
80
92
56
74
88
100
0
试题 F: 成绩统计
7 第十一届蓝桥杯大赛软件类省赛第二场 Java 大学 C
【样例输出】
71%
43%
【评测用例规模与约定】
对于 50 % 的评测用例, 1 n 100
对于所有评测用例, 1 n 10000
这个题就是送分题  循环输入  相除得到一个小数  主要是怎么变为百分数
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int a1 = 0;// 及格的人数
		int a2 = 0;// 优秀的人数
		int num[] = new int[n];
		for (int i = 0; i < n; i++) {
			num[i] = sc.nextInt();
			if (num[i] >= 60) {
				a1++;
			}
			if (num[i] >= 85) {
				a2++;
			}
		}
		double b1 = a1 / (n * 1.0) * 100;// 及格率
		double b2 = a2 / (n * 1.0) * 100;// 优秀率
		System.out.printf("%.0f", b1);
		System.out.println("%");
		System.out.printf("%.0f", b2);
		System.out.println("%");
	}

}

试题 G: 单词分析

时间限制 : 1.0s
内存限制 : 512.0MB
本题总分: 20
【问题描述】
小蓝正在学习一门神奇的语言,这门语言中的单词都是由小写英文字母组
成,有些单词很长,远远超过正常英文单词的长度。小蓝学了很长时间也记不
住一些单词,他准备不再完全记忆这些单词,而是根据单词中哪个字母出现得
最多来分辨单词。
现在,请你帮助小蓝,给了一个单词后,帮助他找到出现最多的字母和这
个字母出现的次数。
【输入格式】
输入一行包含一个单词,单词只由小写英文字母组成。
【输出格式】
输出两行,第一行包含一个英文字母,表示单词中出现得最多的字母是哪
个。如果有多个字母出现的次数相等,输出字典序最小的那个。
第二行包含一个整数,表示出现得最多的那个字母在单词中出现的次数。
【样例输入】
lanqiao
【样例输出】
a
2
【样例输入】
longlonglongistoolong
试题 G: 单词分析
9 第十一届蓝桥杯大赛软件类省赛第二场 Java 大学 C
【样例输出】
o
6
【评测用例规模与约定】
对于所有的评测用例,输入的单词长度不超过 1000
这种题的思路  拆分为char  利用ascll码当下标  在数组里记录次数  最后遍历找到最大的值  输出它的下标转为字符类型  及最大值
package 第十一届C;

import java.util.Scanner;

public class T7 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String a = sc.nextLine();
		sc.close();
		int[] aa = new int[300];
		int max = 0;
		for (int i = 0; i < a.length(); i++) {
			aa[a.charAt(i)]++;
			if (aa[a.charAt(i)]>max) {
				max = aa[a.charAt(i)];
			}
		}
		for (int i = 0; i < aa.length; i++) {
			if (aa[i] == max) {
				System.out.println((char)i);
				System.out.println(max);
				break;
			}
		}
	}
}

试题 H: 数字三角形

时间限制 : 1.0s
内存限制 : 512.0MB
本题总分: 20
【问题描述】
上图给出了一个数字三角形。从三角形的顶部到底部有很多条不同的路径。
对于每条路径,把路径上面的数加起来可以得到一个和,你的任务就是找到最
大的和。
路径上的每一步只能从一个数走到下一层和它最近的左边的那个数或者右
边的那个数。此外,向左下走的次数与向右下走的次数相差不能超过 1
【输入格式】
输入的第一行包含一个整数 N (1 < N 100) ,表示三角形的行数。下面的
N 行给出数字三角形。数字三角形上的数都是 0 100 之间的整数。
【输出格式】
输出一个整数,表示答案。
【样例输入】
5
7
3 8
8 1 0
2 7 4 4
4 5 2 6 5
【样例输出】
27
 
这个题是一个深搜循环所有的路线  最后判断L R 相减的绝对值是不是 <=1 取最小值  当然 我下面发的代码可
以整到25  再大就超时了 emmmm
 
package 第十一届C;

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;
import java.util.Stack;

/*
5
7
3 8
8 1 0
2 7 4 4
4 5 2 6 5
 */
public class T8 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int[][] aa = new int[a][a];
		for (int i = 0; i < aa.length; i++) {
			for (int j = 0; j <= i; j++) {
				aa[i][j] = sc.nextInt();
			}
		}
		sc.close();
		boolean[][] bb = new boolean[a][a];
		Stack<Integer> stax = new Stack<Integer>();
		Stack<Integer> stay = new Stack<Integer>();
		Queue<Integer> quex = new LinkedList<Integer>();
		Queue<Integer> quey = new LinkedList<Integer>();
		int L = 0;//左下次数
		int R = 0;//右下次数
		stax.add(0);
		stay.add(0);
		bb[0][0] = true;
		int sum = aa[0][0];//集合中加入了第一个的坐标  sum初始值为第一个值
		int max = 0;
		while (!stax.isEmpty()) {
			boolean kk = true;
			int x = stax.peek();
			int y = stay.peek();
			if (x + 1 < a && !bb[x + 1][y]) {//左下走
				stax.add(x + 1);
				stay.add(y);
				bb[x + 1][y] = true;
				kk = false;
				L++;
				sum += aa[x + 1][y];
			}
			if (x + 1 < a && y + 1 < a && !bb[x + 1][y + 1] && kk) {//右下走  kk为true时代表左下走不成功
				stax.add(x + 1);
				stay.add(y + 1);
				bb[x + 1][y + 1] = true;
				kk = false;
				R++;
				sum += aa[x + 1][y + 1];
			}
			if (kk) {
				if (Math.abs(L - R) <= 1) {//计算满足条件的最大值
					max = Math.max(max, sum);
				}
				int px = stax.pop();
				int py = stay.pop();
				sum -= aa[px][py];
				if (!stay.isEmpty()&&py > stay.peek()) {
					R--;
				} else {
					L--;
				}
                //利用广搜把以这个值为尖的向下的三角形重置为未访问过  否则的话  下面的点就循环了一遍不能得到所有的路线
				quex.add(px);
				quey.add(py);
				while (!quex.isEmpty()) {
					int xx = quex.poll();
					int yy = quey.poll();
					if (xx+1<a) {
						quex.add(xx+1);
						quey.add(yy);
						bb[xx+1][yy] = false;
					}
					if (xx+1<a&&yy+1<a) {
						quex.add(xx+1);
						quey.add(yy+1);
						bb[xx+1][yy+1] = false;
					}
				}
			}

		}
		System.out.println(max);
	}
}

试题 I: 作物杂交

时间限制 : 1.0s
内存限制 : 512.0MB
本题总分: 25
【问题描述】
作物杂交是作物栽培中重要的一步。已知有
N 种作物 ( 编号 1 N ) ,第
i 种作物从播种到成熟的时间为
T i 。作物之间两两可以进行杂交,杂交时间取
两种中时间较长的一方。如作物
A 种植时间为 5 天,作物 B 种植时间为 7 天,
AB 杂交花费的时间为 7 天。作物杂交会产生固定的作物,新产生的作物仍
然属于 N 种作物中的一种。
初始时,拥有其中 M 种作物的种子 ( 数量无限,可以支持多次杂交 ) 。同时
可以进行多个杂交过程。求问对于给定的目标种子,最少需要多少天能够得到。
如存在
4 种作物 ABCD ,各自的成熟时间为 5 天、 7 天、 3 天、 8 天。初
始拥有 AB
两种作物的种子,目标种子为 D ,已知杂交情况为 A × B
C
A × C D 。则最短的杂交过程为:
1 天到第 7 ( 作物 B 的时间 ) A × B C
8 天到第 12 ( 作物 A 的时间 ) A × C D
花费 12 天得到作物 D 的种子。
【输入格式】
输入的第 1 行包含 4 个整数 N , M , K , T N 表示作物种类总数 ( 编号
1
N ) M 表示初始拥有的作物种子类型数量, K 表示可以杂交的方案数, T
表示
目标种子的编号。
2 行包含 N 个整数,其中第 i 个整数表示第 i
种作物的种植时间
T i (1 T i 100)
3 行包含 M 个整数,分别表示已拥有的种子类型
K j (1 K j M ) K j
两两不同。
4 K + 3 行,每行包含 3 个整数 A , B , C ,表示第 A 类作物和第
B
作物杂交可以获得第 C 类作物的种子。
试题 I: 作物杂交
13 第十一届蓝桥杯大赛软件类省赛第二场 Java 大学 C
【输出格式】
输出一个整数,表示得到目标种子的最短杂交时间。
【样例输入】
6 2 4 6
5 3 4 6 4 9
1 2
1 2 3
1 3 4
2 3 5
4 5 6
【样例输出】
16
【样例说明】
1
天至第
5 天,将编号 1 与编号 2 的作物杂交,得到编号
3
的作物种
子。
6
天至第
10 天,将编号 1 与编号 3 的作物杂交,得到编号
4
的作物种
子。
6
天至第
9 天,将编号 2 与编号 3 的作物杂交,得到编号
5
的作物种
子。
11 天至第 16 天,将编号 4 与编号 5 的作物杂交,得到编号 6 的作物种
子。
总共花费 16 天。
【评测用例规模与约定】
对于所有评测用例, 1 N 2000 , 2
M N , 1 K 100000 , 1 T N ,
保证目标种子一定可以通过杂交得到
题目花里胡哨  我的心里乱糟糟  算了不会  崩了崩了  溜了

试题 J: 子串分值

时间限制 : 1.0s
内存限制 : 512.0MB
本题总分: 25
【问题描述】
对于一个字符串 S ,我们定义 S 的分值 f ( S )
S 中恰好出现一次的字符
个数。例如 f ( ”aba” ) = 1 f ( ”abc” ) = 3 , f ( ”aaa” ) = 0
现在给定一个字符串 S [0 .. n 1] (长度为 n ),请你计算对于所有
S 的非空
子串 S [ i .. j ](0 i j < n ) f ( S [ i .. j ]) 的和是多少。
【输入格式】
输入一行包含一个由小写字母组成的字符串 S
【输出格式】
输出一个整数表示答案。
【样例输入】
ababc
【样例输出】
21
【样例说明】
子串
f
a
1
ab 2
aba 1
abab 0
ababc 1
试题 J: 子串分值
15 第十一届蓝桥杯大赛软件类省赛第二场 Java 大学 C
b 1
ba 2
bab 1
babc 2
a 1
ab 2
abc 3
b 1
bc 2
c 1
【评测用例规模与约定】
对于 20 % 的评测用例, 1 n 10
对于 40 % 的评测用例, 1 n 100
对于 50 % 的评测用例, 1 n 1000
对于 60 % 的评测用例, 1 n 10000
对于所有评测用例, 1 n 100000
按照题目写一个方法  传进一个字符串  返回它的分值  然后利用循环 切分 调用方法  统计分值  输出
2000字符串不超时  反正是编程大题了  能得分就好了  不希望满分了
package 第十一届C;

import java.util.Scanner;

public class T10 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String a =sc.nextLine();
		sc.close();
		long sum = 0;
		for (int i = 0; i < a.length(); i++) {
			for (int j = i+1; j <= a.length(); j++) {
				sum+=f(a.substring(i, j));
				//System.out.println(a.substring(i, j));
			}
		}
		System.out.println(sum);
	}
	public static int f(String a) {
		int [] aa = new int[30];
		for (int i = 0; i < a.length(); i++) {
			aa[a.charAt(i)-'a']++;
		}
		int sum = 0;
		for (int i = 0; i < aa.length; i++) {
			if (aa[i] == 1) {
				sum++;
			}
		}
		return sum;
	}
}

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