其他分享
首页 > 其他分享> > [kungbin] 专题12 基础DP

[kungbin] 专题12 基础DP

作者:互联网

01

 

04[和最大上升子序] E - Super Jumping! Jumping! Jumping!

题目:

给定n个数字,选出一组递增子序列,使得和最大

分析:

把最长上升子序的递推公式改成求和

代码:

#include <bits/stdc++.h>
using namespace std;
int n;
int a[1010];
int dp[1010];
void work()
{
//  cin >> n;
    for (int i = 1; i <= n; i ++ ) cin >> a[i], dp[i] = a[i];
    int ans = 0;
    for (int i = 1; i <= n; i ++ )
    {
        for (int j = 1; j < i; j ++ ) 
            if (a[i] > a[j])
                dp[i] = max(dp[i], dp[j] + a[i]);
        ans = max(ans, dp[i]);
    }
        
    
    cout << ans << endl; 
}
int main()
{
    while (cin >> n, n)
    {
        work(); 
    }    
    return 0;
}

  

 

05 [完全背包求体积恰好为m的最小值] F - Piggy-Bank

题目:

如标签一样,完全背包求提及恰好为m的最小值

分析:

注意初始化,dp[0] = 0, 其他的都是无穷大,这样答案只能从0转移来,不会从其他的地方转移而来

代码:

#include <bits/stdc++.h>
using namespace std;
int n, m, mm, mmm;
int dp[10005];
void work()
{
    //使填装背包的体积恰好为m,且价值最低 
    cin >> mm >> mmm;
    m = mmm - mm;
    cin >> n;
    memset(dp, 0x3f, sizeof dp);
    dp[0] = 0;
    int w, v;
    for (int i = 1; i <= n; i ++ )
    {
        cin >> w >> v;
        for (int j = v; j <= m; j ++ ) 
            dp[j] = min(dp[j], dp[j - v] + w);
    }
    if (dp[m] != 0x3f3f3f3f) printf("The minimum amount of money in the piggy-bank is %d.\n", dp[m]);
    else puts("This is impossible.");
}
int main()
{
    int t; cin >> t;
    while (t -- ) work();
    return 0;
}
 

  





标签:12,kungbin,int,work,mmm,Jumping,DP,ans,dp
来源: https://www.cnblogs.com/Iamcookieandyou/p/15244773.html