HDU 1260 Tickets(简单DP)

【题意简述】:

输入:

2
2
20 25
40
1
8 

输出:

这里的数据依次表示的意思为:第一个2,代表两组数据,然后下面的2表示两个人,如果单买票的话,其中第一个人会花费20S,另一个人会花费25S,如果两人一起买要花费40S(注意这里的两人一起买必须是相挨着的两个人才可以),因为题目是求得是最短的时间是多少,所以输入40S。具体的时间就是:

08:00:40 am

另一个就不再赘述。

【分析】:对于求最短的时间,求最优解,我们可以很简单的建立状态转移方程:

dp[i] = min(dp[i-1]+ss[i], dp[i-2]+dd[i-1])  //  分别表示自己单买所花费的时间,另一个是和别人一起买所花费的时间

代码,是别人的优质代码:http://www.cnblogs.com/Griselda/archive/2013/06/05/3118892.html

#include <stdio.h>
#include <cstring>
#include <algorithm>
using namespace std;

const int MAXN = 2010;

int main()
{
    int T, n;
    int d[MAXN], s[MAXN], dp[MAXN] = {0};
    int hh, mm, ss;
    scanf("%d", &T);
    while (T--) {
        scanf("%d", &n);
        for (int i = 1; i <= n; ++i)
            scanf("%d", &s[i]);
        for (int i = 2; i <= n; ++i)
            scanf("%d", &d[i]);
        dp[1] = s[1];
        for (int i = 2; i <= n; ++i)
            dp[i] = min(dp[i-1]+s[i], dp[i-2]+d[i]);
        hh = dp[n]/3600;
        mm = dp[n]%3600/60;
        ss = dp[n]%60;
        printf("%02d:%02d:%02d%s\n", (8+hh)%24, mm, ss, (hh+8)%24>12?" pm":" am");
    }
    return 0;
}
时间: 2024-10-12 16:49:02

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