华为笔试java
第一题 AC
考虑第一个数十进制与十六进制互转
package huawei;
import java.util.Scanner;
public class p1 {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
String s = input.next();
int n = hextoten(s);
String[] str = new String[n - 1];
for(int i = 0; i < n - 1; i++){
str[i] = input.next();
}
int count = 1;
StringBuilder sb = new StringBuilder();
for(int i = 0; i < n - 1; i++){
char[] c = str[i].toCharArray();
if(c[0] == 'A'){
sb.append(" 12" + " 34" );
count = count + 2;
}else if(c[0] == 'B'){
sb.append(" AB" + " CD");
count = count + 2;
}else{
sb.append(" " + c[0]);
count ++;
}
}
String countres = tentohex(count);
String res = countres + sb.toString();
System.out.println(res);
}
private static int hextoten(String str){
int res = 0;
for(int i = 0; i < str.length(); i++){
res = res * 16;
if(str.charAt(i) >= '0' && str.charAt(i) <= '9') {
res = res + (str.charAt(i) - '0');
}else{
res = res + (str.charAt(i) - 'A' + 10);
}
}
return res;
}
private static String tentohex(int num){
char[] map = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
String res = "";
while(num != 0){
int x = num&0xF;
res = map[(x)] + res;
num = (num >>> 4);
}
return res;
}
}
第二题 AC
package huawei;
import java.util.Scanner;
public class p2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int low = input.nextInt();
int high = input.nextInt();
int one = 0;
int ten = 0;
for(int i = low; i < high; i++){
if(fun(i) == true){
int num = i;
one += num % 10;
num /= 10;
ten += num % 10;
}
}
int res = Math.min(one, ten);
System.out.println(res);
}
private static boolean fun(int n){
for(int i = 2; i < n; i++){
if(n % i == 0)
return false;
}
return true;
}
} 第三题 用HashSet，暴力出来只有80 package huawei;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;
public class p3 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String str1 = input.nextLine();
int m = input.nextInt();
input.nextLine();
HashSet<String> set = new HashSet<String>();
set.add(str1);
ArrayList<String> list = new ArrayList<>();
for(int i = 0; i < m; i++){
String strtemp = input.nextLine();
list.add(strtemp);
for(String str : set){
if(strtemp.contains(str)){
String[] array = strtemp.split(",");
for(int j = 0; j < array.length; j++){
set.add(array[j]);
}
break;
}
}
}
for(int t = 0; t < m; t++) {
for (int i = 0; i < m; i++) {
String strtemp = list.get(i);
for (String str : set) {
if (strtemp.contains(str)) {
String[] array = strtemp.split(",");
for (int j = 0; j < array.length; j++) {
set.add(array[j]);
}
break;
}
}
}
}
int res = set.size();
System.out.println(res);
}
}
手写数字识别就是一个作业而已