hdu4310

本文探讨解决战斗中最小血量消耗的问题,通过分析初始思路与正确排序策略,展示排序算法在实际问题解决中的应用。文章通过具体代码实现,详细解释排序规则,并提供代码实现供读者学习。

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我先说一下题意吧:就是对面有很多对手  你每次可以打掉一滴血    然后给你了每个对手的血量  和每回合能攻击多少血  然后让你求出你最少消耗的血量

思路:这道题我最初的思路就是把每个人的攻击力排序 然后依次杀掉攻击力重大到小的对手。

交了一万次啊   还是不对 

最后问了大神才知道要用攻击力和血量的比值来排序 

你们可以自己在纸上推一下  这里我就不写为什么了

下面看代码

#include<stdio.h>
#include<math.h>
#include<string.h>
#include<math.h>
#include<iostream>
#include<algorithm>

using namespace std;

struct node
{
    int hp;
    int dps;
    double chushu;
}a[1005];
bool cmp(node x,node y)
{
    return x.chushu > y.chushu;
}
int main()
{
    int sum;
    int n,i;
    while(~scanf("%d",&n))
    {
        sum = 0;
        for(i = 0;i < n;i++)
        {
            scanf("%d%d",&a[i].dps,&a[i].hp);
            a[i].chushu = (a[i].dps * 1.0) / (a[i].hp * 1.0);
            sum = sum + a[i].dps;
        }
       // printf("%d = sum  *\n",sum);
        sort(a,a + n,cmp);
        long long shanghai = 0;
        for(i = 0;i < n;i++)
        {
            int miaoshu = a[i].hp / 1;
            shanghai = shanghai + miaoshu * sum;
            sum = sum - a[i].dps;
        }
        printf("%I64d\n",shanghai);

    }
    return 0;
}

以下是hdu4310Java解法: ```java import java.util.*; import java.io.*; public class Main { static int MAXN = 100010; static int MAXM = 200010; static int INF = 0x3f3f3f3f; static int n, m, s, t, cnt; static int[] head = new int[MAXN]; static int[] dis = new int[MAXN]; static boolean[] vis = new boolean[MAXN]; static int[] pre = new int[MAXN]; static int[] cur = new int[MAXN]; static class Edge { int to, next, cap, flow, cost; public Edge(int to, int next, int cap, int flow, int cost) { this.to = to; this.next = next; this.cap = cap; this.flow = flow; this.cost = cost; } } static Edge[] edge = new Edge[MAXM]; static void addEdge(int u, int v, int cap, int flow, int cost) { edge[cnt] = new Edge(v, head[u], cap, flow, cost); head[u] = cnt++; edge[cnt] = new Edge(u, head[v], 0, 0, -cost); head[v] = cnt++; } static boolean spfa() { Arrays.fill(dis, INF); Arrays.fill(vis, false); Queue<Integer> q = new LinkedList<>(); q.offer(s); dis[s] = 0; vis[s] = true; while (!q.isEmpty()) { int u = q.poll(); vis[u] = false; for (int i = head[u]; i != -1; i = edge[i].next) { int v = edge[i].to; if (edge[i].cap > edge[i].flow && dis[v] > dis[u] + edge[i].cost) { dis[v] = dis[u] + edge[i].cost; pre[v] = u; cur[v] = i; if (!vis[v]) { vis[v] = true; q.offer(v); } } } } return dis[t] != INF; } static int[] MCMF(int s, int t) { int flow = 0, cost = 0; while (spfa()) { int f = INF; for (int u = t; u != s; u = pre[u]) { f = Math.min(f, edge[cur[u]].cap - edge[cur[u]].flow); } for (int u = t; u != s; u = pre[u]) { edge[cur[u]].flow += f; edge[cur[u] ^ 1].flow -= f; cost += edge[cur[u]].cost * f; } flow += f; } return new int[]{flow, cost}; } public static void main(String[] args) { Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in))); int T = in.nextInt(); for (int cas = 1; cas <= T; cas++) { n = in.nextInt(); m = in.nextInt(); s = 0; t = n + m + 1; cnt = 0; Arrays.fill(head, -1); for (int i = 1; i <= n; i++) { int c = in.nextInt(); addEdge(s, i, c, 0, 0); } for (int i = 1; i <= m; i++) { int c = in.nextInt(); addEdge(i + n, t, c, 0, 0); } for (int i = 1; i <= n; i++) { for (int j = 1; j <= m; j++) { int c = in.nextInt(); addEdge(i, j + n, INF, 0, c); } } int[] ans = MCMF(s, t); System.out.printf("Case #%d: %d\n", cas, ans[1]); } } } ```
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