[编程题] 牛客输入输出练习1-计算a+b(多组输入)]
1、牛客输入输出练习1-计算a+b(多组输入)
题目描述
计算多组输入的a+b
示例
输入输出描述:
输入描述:
输入包括两个正整数a,b(1 <= a, b <= 10^9),输入数据包括多组。
输出描述:
输出a+b的结果
例如2:
输入:
1 5
10 20
输出:
6
30
Java代码
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
ArrayList<Integer> lis = new ArrayList<Integer>();
while(scanner.hasNextLine()){
String[] lines = scanner.nextLine().split(" ");
int a = Integer.parseInt(lines[0]);
int b = Integer.parseInt(lines[1]);
lis.add(a+b);
}
//输出
for(Integer i : lis){
System.out.println(i);
}
}
}
输出
已AC
2、牛客输入输出练习1-计算a+b(多组输入)
题目描述
Java代码(方法1)
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
int t = scanner.nextInt();
while(--t>=0){
int a = scanner.nextInt();
int b = scanner.nextInt();
System.out.println(a+b);
}
}
}
Java代码(方法2)
import java.util.*;
import java.io.*;
public class Main{
public static void main(String[] args) throws Exception{
//Scanner scanner = new Scanner(System.in);
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
int t =Integer.parseInt(bf.readLine().trim());
String line = null;
while(--t>=0){
line = bf.readLine();
int a = Integer.parseInt(line.trim().split(" ")[0]);
int b = Integer.parseInt(line.trim().split(" ")[1]);
System.out.println(a+b);
}
}
}
3、客输入输出练习-计算a+b(多组输入)
题目描述
Java代码-方法1
import java.util.*;
import java.io.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
while(scanner.hasNextLine()){
String[] line = scanner.nextLine().trim().split(" ");
int a = Integer.parseInt(line[0]);
int b = Integer.parseInt(line[1]);
if(a==0 && b==0){
break;
}else{
System.out.println(a+b);
}
}
}
}
Java方法2
import java.util.*;
import java.io.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
while(scanner.hasNextInt()){
int a = scanner.nextInt();
int b = scanner.nextInt();
if(a==0 && b==0){
break;
}else{
System.out.println(a+b);
}
}
}
}
Java方法3
import java.util.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
while(scanner.hasNextLine()){
String[] line = scanner.nextLine().trim().split(" ");
int a = Integer.parseInt(line[0]);
int b = Integer.parseInt(line[1]);
if(a==0 && b==0){
break;
}else{
System.out.println(a+b);
}
}
}
}
4、输入输出练习4
题目描述
java方法1:按行读取的方式
(list使用Stream求和;截取部分数组)
import java.util.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
//按行输入的方法
while(scanner.hasNextLine()){
String[] line = scanner.nextLine().trim().split(" ");
int first = Integer.parseInt(line[0]);
if(first==0){
break;
}
ArrayList<Integer> lis = new ArrayList<Integer>();
for(String s : line){
lis.add(Integer.parseInt(s));
}
//去除首
lis.remove(0);
//对list求和
int sum = lis.stream().reduce(Integer::sum).orElse(0);
System.out.println(sum);
}
}
}
Java方法:按单独的字符读取
(借用Stream转int[] to List; 借用Stream对List求和)
知识点
//数组转List
List<Integer> l = Arrays.stream(arr).boxed().collect(Collectors.toList());
//list求和
int sum = l.stream().reduce(Integer::sum).orElse(0);
Java代码
import java.util.*;
import java.util.stream.Collectors;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
//按行输入的方法
while(scanner.hasNextInt()){
int first = scanner.nextInt();
if(first==0){
break;
}else{
int[] arr = new int[first];
for(int i=0;i<first;i++){
arr[i] = scanner.nextInt();
}
//数组转List
List<Integer> l = Arrays.stream(arr).boxed().collect(Collectors.toList());
//list求和
int sum = l.stream().reduce(Integer::sum).orElse(0);
System.out.println(sum);
}
}
}
}
Java方法3:-计数
import java.util.*;
import java.util.stream.Collectors;
public class Main{
public static void main(String[] args) throws Exception{
Scanner scanner = new Scanner(System.in);
while(true){
int sum=0;
int fisrt = scanner.nextInt();
if(fisrt==0){
return;
}else{
while(fisrt!=0){
sum += scanner.nextInt();
fisrt--;
}
System.out.println(sum);
}
}
}
}