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POJ 3260 完全背包+多重背包+思维

时间:2019-04-06 18:33:29      阅读:210      评论:0      收藏:0      [点我收藏+]

标签:def   include   gif   tail   scan   anim   online   价值   The   

传送门:https://vjudge.net/problem/20465/origin

题意:你有n种钞票,面值为c[i],数量为v[i],便利店老板有无数张面值为c[i]的钞票,问你买一个价值为T的物品,最少需要经手多少张钞票,老板找零的钞票数也算经手的钞票数

题解:因为我的钞票是有限的,所以将自己看作一个多重背包,老板的钞票是无限的,所以将老板的钞票看做一个完全背包,定义状态dp[i]最少花费多少张钞票可以买价值为i的物品

边界:dp[0]=0;

目的:ans=min(dp1[i]+dp2[i-v])   i>=v;

代码:

技术图片
/**
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 *        ┃       ┃
 *        ┃... ⌒ ...  ┃
 *        ┃       ┃
 *        ┗━┓   ┏━┛
 *          ┃   ┃ Code is far away from bug with the animal protecting          
 *          ┃   ┃   神兽保佑,代码无bug
 *          ┃   ┃           
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// warm heart, wagging tail,and a smile just for you!
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//                 ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬████
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//   ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬██████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████╬╬╬╬╬╬╬███████████╬╬╬╬╬╬╬╬██╬╬╬██╬╬╬██
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// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████▓▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬█████
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//   ███╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██
//       ██████████████  ████╬╬╬╬╬╬███████████████████████████╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████
//                         ███████                           █████  ███████████████████
#include <set>
#include <map>
#include <deque>
#include <queue>
#include <stack>
#include <cmath>
#include <ctime>
#include <bitset>
#include <cstdio>
#include <string>
#include <vector>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

typedef long long LL;
typedef pair<LL, LL> pLL;
typedef pair<LL, int> pLi;
typedef pair<int, LL> pil;;
typedef pair<int, int> pii;
typedef unsigned long long uLL;
#define lson l,mid,rt<<1
#define rson mid+1,r,rt<<1|1
#define bug printf("*********\n")
#define FIN freopen("input.txt","r",stdin);
#define FON freopen("output.txt","w+",stdout);
#define IO ios::sync_with_stdio(false),cin.tie(0)
#define debug1(x) cout<<"["<<#x<<" "<<(x)<<"]\n"
#define debug2(x,y) cout<<"["<<#x<<" "<<(x)<<" "<<#y<<" "<<(y)<<"]\n"
#define debug3(x,y,z) cout<<"["<<#x<<" "<<(x)<<" "<<#y<<" "<<(y)<<" "<<#z<<" "<<z<<"]\n"
LL read() {
    int 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;
}
const double eps = 1e-8;
const int mod = 1e9 + 7;
const int maxn = 2e5 + 5;
const int INF = 0x3f3f3f3f;
const LL INFLL = 0x3f3f3f3f3f3f3f3f;
int dp1[maxn];//体积为i时的物品个数
int dp2[maxn];
int v[maxn];
int w[maxn];
int main() {
#ifndef ONLINE_JUDGE
    FIN
#endif
    int n, V;
    while(~scanf("%d%d", &n, &V)) {
        memset(v, 0, sizeof(v));
        memset(w, 0, sizeof(w));
        for(int i = 1; i <= n; i++) {
            scanf("%d", &v[i]);
        }
        for(int i = 1; i <= n; i++) {
            scanf("%d", &w[i]);
        }
        for(int i = 1; i <= 10000; i++)
            dp1[i] = dp2[i] = INF;
        dp2[0] = 0;
        for(int i = 1; i <= n; i++) {
            for(int j = v[i]; j <= 10000; j++) {
                dp2[j] = min(dp2[j], dp2[j - v[i]] + 1);//计算自己得到面额为j的物品需要的最少的钞票数。因为他有一个上界,可能用大额度的钞票会比用小额度的钞票用的钞票数少
            }
        }
        dp1[0] = 0;
        for(int i = 1; i <= n; i++)
            for(int j = 10000; j >= v[i]; j--)
                for(int k = 1; k <= w[i] && j >= k * v[i]; k++)
                    dp1[j] = min(dp1[j], dp1[j - k * v[i]] + k);//计算商店老板得到面额为j的物品需要的最少的钞票数
        int minn = dp1[V];
        // cout << minn << endl;
        for(int i = V + 1; i <= 10000; i++) {
            if(minn > dp1[i] + dp2[i - V]) minn = dp1[i] + dp2[i - V];
        }
        if(minn != INF )   printf("%d\n", minn);
        else printf("-1\n");
    }
    return 0;
}
View Code

 

POJ 3260 完全背包+多重背包+思维

标签:def   include   gif   tail   scan   anim   online   价值   The   

原文地址:https://www.cnblogs.com/buerdepepeqi/p/10662294.html

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