Complete Building the Houses

Time Limit: 20 Sec  Memory Limit: 256 MB

题目连接

http://acm.uestc.edu.cn/#/problem/show/3

Description

Bear has a large, empty ground for him to build a home. He decides to build a row of houses, one after another, say n in total.

The houses are designed with different height. Bear has m workers in total, and the workers must work side by side. So at a time bear can choose some continuous houses, no more than m, and add their heights by one, this takes one day to finish.

Given the designed height for each house, what is the minimum number of days after which all the houses’ heights are no less than the original design?

Input

The first line of input contains a number T, indicating the number of test cases. (T≤50)

For each case, the first line contains two integers n and m: the number of houses and the number of workers. The next line comes with n non-negative numbers, they are the heights of the houses from left to right. (1≤n,m≤100,000, each number will be less than 1,000,000,000)

Output

For each case, output Case #i: first. (i is the number of the test case, from 1 to T). Then output the days when bear’s home can be built.

Sample Input

2
3 3
1 2 3
3 3
3 2 1

Sample Output

Case #1: 3
Case #2: 3

HINT

题意

你想修n栋房子，高度分别为a[i]，你一次最多可以同时修m栋连在一起的房子，然后问你最少多久能修完这些房子

题解：

暴力做就好了，直接从最左边考虑然后搞搞搞就好了

代码：

//qscqesze
#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
#include <map>
#include <stack>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)
#define test freopen("test.txt","r",stdin)  
#define maxn 200000
#define mod 10007
#define eps 1e-9
int Num;
char CH[20];
const int inf=0x3f3f3f3f;
const ll infll = 0x3f3f3f3f3f3f3f3fLL;
inline ll read()
{
    ll x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
inline void P(int x)
{
    Num=0;if(!x){putchar('0');puts("");return;}
    while(x>0)CH[++Num]=x%10,x/=10;
    while(Num)putchar(CH[Num--]+48);
    puts("");
}
//**************************************************************************************

ll dp[maxn];
void solve()
{
    ll n,m,a,sum=0,ans=0;
    n=read(),m=read();
    for(int i=0;i<n;i++)
    {
        a=read();
        if(i>=m)sum-=dp[i-m];
        dp[i]=0;
        if(a>sum)
        {
            ans+=a-sum;
            dp[i]=a-sum;
            sum=a;
        }
    }
    cout<<ans<<endl;
}
int main()
{
    //test;
    int t=read();
    for(int cas=1;cas<=t;cas++)
    {
        printf("Case #%d: ",cas);
        solve();
    }
}