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import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("输入n的值");

        int n = scanner.nextInt();

        System.out.println("输入m的值");

        int m = scanner.nextInt();

        int sum = 0 ;

        do {

        sum=sum+n;

        n++;

        }while(n<=m) ;

        System.out.print(sum);

    }

}


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