A. Helpful Maths time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Xenia the beginner mathematician is a third year student at elementary school. She is now learning the addition operation.
JavaScript封装一个函数效果类似内置方法concat() 首先回忆concat()的作用: concat() 方法用于连接两个或多个数组.该方法不会改变现有的数组,而仅仅会返回被连接数组的一个副本. 语法 arrayObject.concat(arrayX,arrayX,......,arrayX): 封装函数参考代码: 1 function likeConcat() { 2 3 function aPush(arr) { 4 for (let i = 0; i < arr.length