hdu 2850 Load Balancing (优先队列 + 贪心)
题目大意:
怎么分配n个任务到m个server上使得负载尽量平衡。
思路:
将任务从大到小排序,依次放入负载最小的那个server中。
由于是spj 的缘故,所以能够使用这个贪心。
比方数据
6 2
7 5 3 3 3 3
就会得到错误答案。
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <queue>
using namespace std; struct node
{
int index,load;
bool operator < (const node &cmp)const
{
return load>cmp.load;
}
};
struct foo
{
int index,v;
bool operator < (const foo &cmp)const
{
return v<cmp.v;
}
}save[100005];
priority_queue <node> Q;
int n,m;
int ans[100005];
int main()
{
int T;
scanf("%d",&T);
while(T--)
{
memset(ans,0,sizeof ans);
while(!Q.empty())Q.pop(); scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
{
save[i].index=i;
scanf("%d",&save[i].v);
} sort(save+1,save+1+n); for(int i=0;i<m;i++)
{
node t;
t.index=i;
t.load=0;
Q.push(t);
} for(int i=n;i>=1;i--)
{
node t=Q.top();
Q.pop(); t.load+=save[i].v;
// printf("---%d\n",t.load);
ans[save[i].index]=t.index; Q.push(t);
}
printf("%d\n",n);
for(int i=1;i<=n;i++)
{
printf("%d%c",ans[i],i==n?'\n':' ');
}
}
return 0;
}
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