CF767E Change-free

题目:Change-free

思路:
贪心。
先先假设全部用硬币支付,再用优先队列维护,当硬币数量不够时,弹出会增加的生气值最小的。

代码:

#include<bits/stdc++.h>
using namespace std;

#define maxn 100000
#define ll long long

struct Pair{
    ll x,w;
    bool operator < (const Pair& oth) const {
        return w>oth.w||(w==oth.w&&x<oth.x);
    }
    Pair() {}
    Pair(ll xx,ll ww){
        x=xx,w=ww;
    }
};

ll n,m;
ll v[maxn+5],c[maxn+5];
priority_queue<Pair> que;
ll Notes[maxn+5],Coints[maxn+5];
ll ang=0;

void readin() {
    scanf("%lld%d",&n,&m);
    for(ll i=1;i<=n;i++) {
        scanf("%lld",&v[i]);
        Notes[i]=v[i]/100;
        v[i]%=100;
        if(!v[i]&&Notes[i]) v[i]=100,Notes[i]--;
    }
    for(ll j=1;j<=n;j++) {
        scanf("%lld",&c[j]);
    }
}

void slv() {
    for(ll i=1;i<=n;i++){
        que.push(Pair(i,(100-v[i])*c[i]));
        m-=v[i];
        Coints[i]+=v[i];
        while(m<0) {
            Pair h=que.top();
            que.pop();
            m+=100;
            Notes[h.x]++;
            Coints[h.x]=0;
            ang+=h.w;
        }
    }
}

void print() {
    printf("%lld\n",ang);
    for(ll i=1;i<=n;i++) printf("%lld %lld\n",Notes[i],Coints[i]);
}

int main() {
    readin();
    slv();
    print();
    return 0;
}

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转载自blog.csdn.net/rabbit_ZAR/article/details/81667272