LUOGU P1779 魔鬼杀手_NOI导刊2010提高(03)

传送门

解题思路

背包,首先先用aoe都打残然后单伤补刀,用f[i]表示AOE打了i的伤害的最小花费,g[i]表示单伤打了i的伤害的最小花费。

代码

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdio>
#include<cstring>
#define int long long

using namespace std;
const int MAXN = 105;

inline int rd(){
    int x=0,f=1;char ch=getchar();
    while(!isdigit(ch)) {f=ch=='-'?0:1;ch=getchar();}
    while(isdigit(ch))  {x=(x<<1)+(x<<3)+ch-'0';ch=getchar();}
    return f?x:-x;
}

int f[100005],g[100005],ans=0x3f3f3f3f;
int n,m,val[MAXN],cost[MAXN],hp[MAXN];
bool al[MAXN];

signed main(){
    n=rd();memset(f,0x3f,sizeof(f));
    memset(g,0x3f,sizeof(g));
    for(register int i=1;i<=n;i++) hp[i]=rd();
    m=rd();char c[MAXN],s[MAXN];
    for(register int i=1;i<=m;i++){
        scanf("%s",c+1);cost[i]=rd();
        scanf("%s",s+1);if(s[1]=='A') al[i]=1;
        val[i]=rd();
        if(cost[i]==0 && val[i]>0) {cout<<0<<endl;return 0;}
        if(val[i]>100000) val[i]=100000; 
    }f[0]=0;g[0]=0;
    for(register int i=1;i<=m;i++){
        if(al[i]){
            for(register int j=val[i];j<=100000;j++)
                f[j]=min(f[j],f[j-val[i]]+cost[i]);
        }
        else {
            for(register int j=val[i];j<=100000;j++)
                g[j]=min(g[j],g[j-val[i]]+cost[i]);
        }
    }
    for(register int i=99999;i>=0;i--)  
        if(g[i]>g[i+1]) g[i]=g[i+1];  //打了i+1的伤害就一定打了i的伤害
    for(register int i=0;i<=100000;i++) {
        int now=f[i];if(now>ans) continue;
        for(register int j=1;j<=n;j++){
            if(hp[j]>i) now+=g[hp[j]-i];
            if(now>ans) break;  
        }
        ans=min(ans,now);
    }cout<<ans<<endl;
}
posted @ 2018-08-20 19:14  Monster_Qi  阅读(135)  评论(0编辑  收藏  举报