题解 | #计算某字符出现次数#
计算某字符出现次数
https://www.nowcoder.com/practice/a35ce98431874e3a820dbe4b2d0508b1
通过定义一个函数和哈希算法来实现
function strLength(str,strs,h=[]){
let arr = strs.split('')arr.forEach(v => h[v] = (h[v] || 0) + 1)
return h[str]||0
}
let strs=readline().toLowerCase()
const str=readline().toLowerCase()
console.log(strLength(str,strs))
