HDU 1260 Tickets

H - Tickets

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

Submit Status Practice HDU 1260

Description

Jesus, what a great movie! Thousands of people are rushing to the cinema. However, this is really a tuff time for Joe who sells the film tickets. He is wandering when could he go back home as early as possible. 
A good approach, reducing the total time of tickets selling, is let adjacent people buy tickets together. As the restriction of the Ticket Seller Machine, Joe can sell a single ticket or two adjacent tickets at a time. 
Since you are the great JESUS, you know exactly how much time needed for every person to buy a single ticket or two tickets for him/her. Could you so kind to tell poor Joe at what time could he go back home as early as possible? If so, I guess Joe would full of appreciation for your help. 

 

Input

There are N(1<=N<=10) different scenarios, each scenario consists of 3 lines: 
1) An integer K(1<=K<=2000) representing the total number of people; 
2) K integer numbers(0s<=Si<=25s) representing the time consumed to buy a ticket for each person; 
3) (K-1) integer numbers(0s<=Di<=50s) representing the time needed for two adjacent people to buy two tickets together. 

 

Output

For every scenario, please tell Joe at what time could he go back home as early as possible. Every day Joe started his work at 08:00:00 am. The format of time is HH:MM:SS am|pm. 

 

Sample Input

2
2
20 25
40
1
8 

 

Sample Output

08:00:40 am
08:00:08 am 

 

这个题目比较简单。告诉了每个点的单一耗费，每两个相邻的点的总耗费，求取最小花费。求得之后开始再进行处理，处理成时间和上下午的一些细节问题。

一维坐标转移方程为dp[i] = min(dp[i - 1] + s[i - 1], dp[i - 2] + d[i - 2])

代码如下：

/*************************************************************************
	> File Name: Tickets.cpp
	> Author: Zhanghaoran
	> Mail: chilumanxi@xiyoulinux.org
	> Created Time: Sat 24 Oct 2015 03:34:10 PM CST
 ************************************************************************/

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <cstdlib>

using namespace std;

int N;
int K;
int s[2100];
int d[2100];
int dp[2100];
int main(void){
    scanf("%d", &N);
    while(N --){
        scanf("%d", &K);
        for(int i = 0; i < K; i ++)
            scanf("%d", &s[i]);
        for(int i = 0; i < K - 1; i ++)
            scanf("%d", &d[i]);
        dp[0] = 0;
        dp[1] = s[0];
        for(int i = 2; i <= K; i ++){
            dp[i] = min(dp[i - 1] + s[i - 1], dp[i - 2] + d[i - 2]);
        }
        //printf("%d\n", dp[K]);
        char st[2];
        int h = 0;
        int m = 0;
        if(dp[K] > 3600){
            h = dp[K] / 3600;
            dp[K] %= 3600;
        }
        if(h >= 4){
            h = (8 + h) % 12;
            strcpy(st , "pm");
        }
        else{
            strcpy(st, "am");
            h = h + 8;
        }
        if(dp[K] > 60){
            m = dp[K] / 60;
            dp[K] %= 60;
        }
        printf("%02d:%02d:%02d %s\n",h, m, dp[K], st);
    }
}