SQL 权威指南SQL 解惑在进行非定制化统计时,需要将已有编号方式转换为另外一种便于分析的方式进行统计需求 select case when name='哈尔滨' then '黑龙江' when name='大庆' then '黑龙江' when name='齐齐哈尔' then '黑龙江' when name='长春' then '吉林' when name='吉林' then '吉林' when name='沈阳' then '辽宁' when name='大连' then '辽宁' wh
题意:给定钱,计算其能换成零钱的分类种数. 解题关键:完全背包计数. $dp[i][j]$表示前i个物品构成j元的种类数,然后优化一维. #include<bits/stdc++.h> using namespace std; typedef long long ll; ]={,,,,,,,,,,,,}; ]; ; int main(){ int n; scanf("%d",&n); dp[]=; ;i<;i++){ for(int j=a[i];j<=
import scala.collection.mutable.ArrayBuffer import scala.util.control.Breaks object Exchange { def delete(arg:ArrayBuffer[Int]):ArrayBuffer[Int]={ val breakables = new Breaks breakables.breakable { for (i <- 0 until arg.length) { if (arg(i) == arg.ma