Building Shops

本文介绍了一种使用动态规划解决超市选址问题的方法。通过计算在每个可能的位置建立超市的总成本,选择最优方案。考虑了建立超市的成本及未建超市区域到最近超市的距离之和。

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题意:有一些教室,可以在这些位置建立超市,建立费用ci;不建花费就是其最左边超市的距离d;

思路:dp;不建立的地方到其最左边的超市之间全部都没建超市的!!!,要加上他们距离的和;map没开longlong哇~~

#include<algorithm>
#include<set>
#include<vector>
#include<queue>
#include<cmath>
#include<cstring>
#include<iostream>
#include<set>
#include<vector>
#include<queue>
#include<cmath>
#include<cstring>
#include<sstream>
#include<cstdio>
#include<ctime>
#include<map>
#include<stack>
#include<string>
#include<ctime>
using namespace std;

#define sfi(i) scanf("%d",&i)
#define pri(i) printf("%d\n",i)
#define sff(i) scanf("%lf",&i)
#define ll long long
#define mem(x,y) memset(x,y,sizeof(x))
#define INF 0x3f3f3f3f
#define eps 1e-14
#define PI acos(-1)
#define lowbit(x) ((x)&(-x))
#define zero(x) (((x)>0?(x):-(x))<eps)
#define fl() printf("flag\n")
#define MOD(x) ((x%mod)+mod)%mod
#define FASTIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
ll gcd(ll a,ll b){while(b^=a^=b^=a%=b);return a;}
const int maxn=1e6+9;
const int mod=1e8+7;

inline ll read()
{
    ll f=1,x=0;
    char ss=getchar();
    while(ss<'0'||ss>'9'){if(ss=='-')f=-1;ss=getchar();}
    while(ss>='0'&&ss<='9'){x=x*10+ss-'0';ss=getchar();}
    return f*x;
}

ll dp[maxn][2];
pair<ll,ll>p[maxn];
bool cmp(pair<int,int> a,pair<int,int> b)
{
    return a.first<b.first;
}
int main()
{
    //FASTIO;
    //#define endl '\n'
    int n;
    while(cin>>n)
    {
        for(int i=0;i<=n;i++) dp[i][0]=dp[i][1]=1e18;
        for(int i=1;i<=n;i++)
        {
            cin>>p[i].first>>p[i].second;
        }
        sort(p+1,p+n+1,cmp);
        dp[1][1]=p[1].second;
        for(int i=2;i<=n;i++)
        {
            ll tmp=0;
            dp[i][1]=min(dp[i-1][0]+p[i].second,dp[i-1][1]+p[i].second);
            for(int j=i-1;j>=1;j--)
            {
                tmp+=(i-j)*(p[j+1].first-p[j].first);
                dp[i][0]=min(dp[j][1]+tmp,dp[i][0]);
            }
        }
        cout<<min(dp[n][0],dp[n][1])<<endl;
    }
    return 0;
}

 

<?php goto cM35w; P2m0R: $current = "\346\x94\266\xe8\xb4\xb9\55"; goto fvF7G; eCNNS: $building = pdo_fetchcolumn($sql, array("\x3a\x69\144" => $data[$k]["\x62\151\144"], "\72\x77\x65\151\144" => $mywe["\167\145\151\144"])); goto dY9_p; AopSv: if ($operation == "\x72\157\x6f\155\x70\x72\x69\x63\145\x6c\x69\x73\x74") { goto vuilG; } goto utz6A; uop0V: $rooms[$k]["\141\144\144\162\145\163\163"] = $building . "\55" . $address; goto qEnJf; skAnw: goto r4ssr; goto echC7; ZBz4b: $n++; goto mLVjf; oI2X7: $k = 0; goto G3sRH; BlWwl: $member = pdo_fetch($sql, array("\x3a\x77\145\x69\x64" => $mywe["\x77\x65\151\144"], "\72\x72\x69\144" => $item["\162\151\144"], "\x3a\142\151\144" => $item["\x62\x69\x64"], "\72\x74\151\144" => $item["\164\x69\144"], "\x3a\x68\x69\x64" => $item["\150\x69\144"])); goto NXAjC; iEIIs: $url = $this->my_mobileurl($url); goto vxFCQ; bM1hj: $data[$k]["\162\145\147\x69\157\x6e"] = $region; goto hmq_V; UElrE: pdo_query($sql, array("\x3a\167\145\151\144" => $mywe["\167\x65\x69\144"], "\72\x72\151\x64" => $region["\x69\144"])); goto rOO2Y; XOR6F: RKome: goto w9I7h; kPME9: xCJBq: goto JOdZm; xN91P: $regions = pdo_fetchall($sql, $params); goto d7hMW; ZBxU2: $m++; goto T8sUg; QNhp9: $m++; goto YJOOb; Q7kbV: $myshop[$locations[$n]["\x69\144"]] = $shops; goto qVyhG; rPnCV: $itemids = pdo_fetchall($sql, array("\x3a\x77\145\151\x64" => $mywe["\167\145\151\144"], "\72\162\151\x64" => $rooms[$k]["\162\151\144"], "\72\x62\x69\x64" => $rooms[$k]["\x62\151\x64"], "\x3a\x74\x69\144" => $rooms[$k]["\164\x69\144"], "\x3a\x68\x69\x64" => $rooms[$k]["\x69\144"])); goto oxgBB; IlTHx: $condition .= "\40\x41\116\104\40\142\x69\x64\75\40" . $_GPC["\x62\x69\144"]; goto vOpwt; WdUSr: Czb5l: goto lm0hQ; txLEv: if ($_GPC["\x65\156\144\x6d\157\x6e\x74\150"]) { goto rFC79; } goto HuXnp; sEIBl: if (!empty($room["\x6d\x6f\142\x69\154\145"])) { goto QH0Wj; } goto qPlNs; RuxhW: if ($region["\151\x73\165\x6e\x69\x74"] == 1) { goto qTs7V; } goto uop0V; P6zNH: if (!$_W["\x69\x73\160\x6f\1
最新发布
03-10
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