51NOD消灭兔子

Posted 2020-09-23 ONION_CYC

【算法】贪心

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<queue>
using namespace std;
const int maxn=50010;
struct cyc{int num,value;}b[maxn];
int n,m,a[maxn];
long long ans=0;
priority_queue<int,vector<int>,greater<int> >q;
bool cmp(cyc a,cyc b)
{return a.num<b.num;}
int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)scanf("%d",&a[i]);
    sort(a+1,a+n+1);
    for(int i=1;i<=m;i++)scanf("%d%d",&b[i].num,&b[i].value);
    sort(b+1,b+m+1,cmp);
    int now=m+1;
    bool ok=1;
    for(int i=n;i>=1;i--)
    {
        for(int j=now-1;j>=1;j--)
        {
            if(b[j].num>=a[i]){now=j;q.push(b[j].value);}
            else break;
        }
        if(q.empty()){ok=0;break;}
        ans+=q.top();
        q.pop();
    }
    if(!ok)printf("No Solution");
    else printf("%lld",ans);
    return 0;
}

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