A common typing error is to place the hands on the keyboard one row to the right of the correct position. So “Q” is typed as “W” and “J” is typed as “K” and so ...

Problem Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture: ...

Problem Description 给定一个日期，输出这个日期是该年的第几天。

Problem Description Larry graduated this year and finally has a job. He’s making a lot of money, but somehow never seems to have enough. Larry has decided tha...

Problem Description 数列的定义如下： 数列的第一项为n，以后各项为前一项的平方根，求数列的前m项的和。

Problem Description 统计给定的n个数中，负数、零和正数的个数。

Problem Description 输入一个百分制的成绩t，将其转换成对应的等级，具体转换规则如下： 90~100为A; 80~89为B; 70~79为C; 60~69为D; 0~59为E;

Output 对于每组输入数据，输出它的绝对值，要求每组数据输出一行，结果保留两位小数。

Output 输出对应的球的体积，对于每组输入数据，输出一行，计算结果保留三位小数。

Problem Description 输入两点坐标（X1,Y1）,（X2,Y2）,计算并输出两点间的距离。