HDU ACM OJ 1000 1001 1002答案(JAVA)

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HDU OJ比较简单的三道题。主要是熟悉一下格式和写法。

1000：

import java.util.Scanner;/** * Calculate A + B. * @author Jamin * */public class Main {public static void main(String arg[]) {Scanner scin = new Scanner(System.in);while (scin.hasNextInt()) {int a = scin.nextInt();int b = scin.nextInt();System.out.println(a + b);}}}

1001：

import java.util.Scanner;/** * In this problem,your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n. * @author Jamin * */public class Main {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);while(scanner.hasNext()){int n = scanner.nextInt();if(n % 2 == 0){int sum = n/2 * (n + 1);System.out.println(sum);System.out.println();}else{int sum = (n + 1) /2 *n;System.out.println(sum);System.out.println();}}}}

1002：

import java.math.BigInteger;import java.util.Scanner;/** * I have a very simple problem for you.  * Given two integers A and B,  * your job is to calculate the Sum of A + B. * @author Jamin * */public class Main {//374MS11520K1062B//312MS11452K1083Bpublic static void main(String[] args) {Scanner scanner = new Scanner(System.in);int num = scanner.nextInt();BigInteger a , b;StringBuilder stringBuilder = new StringBuilder();for(int i = 1 ; i<= num; i++){stringBuilder.setLength(0);a = scanner.nextBigInteger();b = scanner.nextBigInteger();//case 1:stringBuilder.append("Case ");stringBuilder.append(i);stringBuilder.append(":");System.out.println(stringBuilder);//a + b = sumstringBuilder.setLength(0);stringBuilder.append(a);stringBuilder.append(" + ");stringBuilder.append(b);stringBuilder.append(" = ");stringBuilder.append(a.add(b));System.out.println(stringBuilder);//if not last line add block line after resultif(i < num){System.out.println();}}}////327MS11660K////358MS11664K564B//public static void main(String[] args) {////Scanner scanner = new Scanner(System.in);//int num = scanner.nextInt();//BigInteger a , b;//for(int i = 1 ; i<= num; i++){//a = scanner.nextBigInteger();//b = scanner.nextBigInteger();//System.out.println("Case " + i +":");//System.out.println(a + " + " + b + " = " + a.add(b));//if(i < num){//System.out.println();//}//}//}}

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