• 【2017"百度之星"程序设计大赛


    Link:

    Description

    Solution

    因为技能的效果和花费是不会变的;
    所以,考虑预处理m个技能达成一定的伤害最少需要的魔法石数量;
    可以把对这m个技能做一个类似的完全背包就可以了.
    (对11种不同的防御值都做一遍)
    最后对每个怪兽,O(1)输出;
    (分类输出)

    NumberOf WA

    0

    Reviw


    Code

    #include <bits/stdc++.h>
    using namespace std;
    #define lson l,m,rt<<1
    #define rson m+1,r,rt<<1|1
    #define LL long long
    #define rep1(i,a,b) for (int i = a;i <= b;i++)
    #define rep2(i,a,b) for (int i = a;i >= b;i--)
    #define mp make_pair
    #define pb push_back
    #define fi first
    #define se second
    #define ms(x,y) memset(x,y,sizeof x)
    #define ri(x) scanf("%d",&x)
    #define rl(x) scanf("%lld",&x)
    #define rs(x) scanf("%s",x+1)
    #define oi(x) printf("%d",x)
    #define ol(x) printf("%lld",x)
    #define oc putchar(' ')
    #define os(x) printf(x)
    #define all(x) x.begin(),x.end()
    #define Open() freopen("F:\rush.txt","r",stdin)
    #define Close() ios::sync_with_stdio(0)
    
    typedef pair<int,int> pii;
    typedef pair<LL,LL> pll;
    
    const int dx[9] = {0,1,-1,0,0,-1,-1,1,1};
    const int dy[9] = {0,0,0,-1,1,-1,1,-1,1};
    const double pi = acos(-1.0);
    const int N = 10;
    const int M = 1000;
    const int INF = 0x3f3f3f3f;
    
    int n,m,cost[M+100];
    LL f[N+10][M+100];
    vector <int> v[N+10];
    
    int main(){
        //Open();
        //Close();
        while(~ri(n)){
            ri(m);
            rep1(i,0,N) v[i].clear();
            rep1(i,1,n){
                int x,y;
                ri(x),ri(y);
                v[y].pb(x);
            }
    
            ms(cost,255);
            rep1(i,1,m){
                int x,y;
                ri(x),ri(y);
                if (cost[y]==-1)
                    cost[y] = x;
                else
                    cost[y] = min(cost[y],x);
            }
    
            bool solved = true;
            LL ans = 0;
            rep1(b,0,10){
                ms(f[b],INF);
                f[b][0] = 0;
                rep1(i,b+1,1000)
                    if (cost[i]!=-1){
                        // c = cost[i] w = i - b;
                        rep1(j,0,1000)
                            if (f[b][j]<INF){
                                int nextj = j + i - b;
                                if (nextj > 1001) nextj = 1001;
                                f[b][nextj] = min(f[b][nextj],f[b][j] + cost[i]);
                            }
                    }
                rep2(i,1000,1)
                    f[b][i] = min(f[b][i],f[b][i+1]);
    
                int len = v[b].size();
                rep1(i,0,len-1){
                    int x = v[b][i];
                    if (f[b][x] >= INF){
                        solved = false;
                        break;
                    }
                    ans += f[b][x];
                }
            }
            if (solved){
                ol(ans);puts("");
            }
            else
                puts("-1");
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/AWCXV/p/7626134.html
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