1 判断链表有环
2
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.util.Scanner;
public class z2 {
// [1,2,3,4,5]
static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
static int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
static String next() throws IOException {
in.nextToken();
return (String) in.sval;
}
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
String str = input.nextLine();
int k = input.nextInt();
str = str.substring(1, str.length() - 1);
String [] s = str.split(",");
for(int i = 0; i < s.length / k; i++) { // 需要翻转的次数
// if((k & 1) != 0) { // 奇数,中间的不需要翻转
int start = i * k;
int end = start + k - 1;
String tmp = null;
while(start <= end) {
tmp = s[start];
s[start] = s[end];
s[end] = tmp;
start++;
end--;
}
// }
}
System.out.print("[");
for(int i = 0; i < s.length; i++) {
if(i != s.length - 1) {
System.out.print(s[i] + ",");
}else {
System.out.print(s[i] + "]");
}
}
System.out.println();
}
}
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3.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.util.Scanner;
public class z3 {
static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
static int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
static String next() throws IOException {
in.nextToken();
return (String) in.sval;
}
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
int n = input.nextInt();
String[] s = new String[n];
for (int i = 0; i < n; i++) {
s[i] = input.next();
// System.out.println(s[i]);
}
int num = 0;
// path的前面一定是有/的,我根据前面的/来判定输出的数
for (int i = 0; i < n; i++) {
num = 1;
if (s[i].charAt(s[i].length() - 1) == '/') {
// System.out.println(s[i] + " 最后是/");
s[i] = s[i].substring(0, s[i].length() - 1);
// System.out.println(s[i] + " 最后的/ 已经去除了");
}
for (int j = 0; j < i; j++) {
if (s[i].equals(s[j])) {
num++;
}
}
String[] str = s[i].split("/");
for (int k = 1; k < str.length; k++) {
if (k == 1 || k == str.length - 1) {
System.out.print(1);
} else {
System.out.print(num);
}
}
System.out.print(" ");
}
}
}
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