zoukankan      html  css  js  c++  java
  • light oj 12311232 1233 Coin Change 背包

    题目链接

    In a strange shop there are n types of coins of value A1, A2 ... AnC1, C2, ... Cn denote the number of coins of value A1, A2 ... An respectively. You have to find the number of ways you can make K using the coins.

    For example, suppose there are three coins 1, 2, 5 and we can use coin 1 at most 3 times, coin 2 at most 2 times and coin 5 at most 1 time. Then if K = 5 the possible ways are:

    1112

    122

    5  ………………………………

    暂时到半懂不懂也没办法讲明白,就不误人子弟了,直接贴代码了。

    #include <stdio.h>
    #include <string.h>
    const int mod = 100000007;
    int dp[1005];
    int coin[55];
    int cnt[55];
    
    int main()
    {
        int t, n, k;
        scanf("%d", &t);
        for (int tc = 1; tc <= t; tc++)
        {
            scanf("%d %d", &n, &k);
            for (int i = 1; i <= n; i++)
            {
                scanf("%d", &coin[i]);
            }
            for (int j = 1; j <= n; j++)
            {
                scanf("%d", &cnt[j]);
            }
            memset(dp, 0, sizeof(dp));
            dp[0] = 1;
            for (int i = 1; i <= n; i++)
            {
                for (int j = k; j >= 0; j--)
                {
                    for (int l = 1; l <= cnt[i]; l++)
                    {
                        if (j - l*coin[i] >= 0)
                        dp[j] += dp[j-coin[i]*l];
                    }
                }
                for (int j = 0; j <= k; j++)
                    dp[j] %= mod;
            }
            printf("Case %d: %d\n", tc, dp[k]);
        }
        return 0;
    }



    如果说把第一题看做01背包的话,这一题就是完全背包了 

    #include <stdio.h>
    #include <string.h>
    const int mod = 100000007;
    int dp[10050];
    int coin[105];
    
    int main()
    {
        int t, n, k;
        scanf("%d", &t);
        for (int tc = 1; tc <= t; tc++)
        {
            scanf("%d %d", &n, &k);
            for (int i = 1; i <= n; i++)
            {
                scanf("%d", &coin[i]);
            }
    
            memset(dp, 0, sizeof(dp));
            dp[0] = 1;
            for (int i = 1; i <= n; i++)
            {
                for (int j = coin[i]; j <= k; j++)
                {
                    dp[j] += dp[j-coin[i]];
                    dp[j] %= mod;
                }
            }
            printf("Case %d: %d\n", tc, dp[k]);
        }
        return 0;
    }


    第三题又是完全背包
    #include <stdio.h>
    #include <string.h>
    
    int dp[100005];
    int coin[101];
    int cnt[101];
    int used[1000101];
    
    int main()
    {
        int t, n, k;
        scanf("%d", &t);
        for (int ca = 1; ca <= t; ca++)
        {
            scanf("%d %d", &n, &k);
            for (int i = 1; i <= n; i++)
            {
                scanf("%d", &coin[i]);
            }
            for (int j = 1; j <= n; j++)
            {
                scanf("%d", &cnt[j]);
            }
            memset(dp, 0, sizeof(dp));
            dp[0] = 1;
            int ans = 0;
            for (int i = 1; i <= n; i++)
            {
                memset(used, 0, sizeof(used));
                for (int j = coin[i]; j <= k; j++)
                {
                    if (!dp[j] && dp[j-coin[i]] && used[j-coin[i]] < cnt[i])
                    {
                        ans++;
                        used[j]=used[j-coin[i]]+1;
                        dp[j] = 1;
                    }
                }
            }
            printf("Case %d: %d\n", ca, ans);
        }
        return 0;
    }


  • 相关阅读:
    HTML5实现大文件分片上传教程
    HTML5实现大文件分片上传方案
    HTML5实现大文件分片上传技术
    HTML5实现大文件分片上传实例解析
    IfcRepresentationMap——Mapped shape with transformation
    UWB基站地图数据
    IfcRepresentationMap—Mapped shape without transformation
    Exception
    【官网链接】 REPRODUCIBILITY —— pytorch的可复现性
    【转载】 pytorch reproducibility —— pytorch代码的可复现性
  • 原文地址:https://www.cnblogs.com/xindoo/p/3595111.html
Copyright © 2011-2022 走看看