hdoj 2647 Reward【反向拓扑排序】
Reward
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 5617 Accepted Submission(s):
1707
festival is coming , he wants to distribute rewards to his workers. Now he has a
trouble about how to distribute the rewards.
The workers will compare their
rewards ,and some one may have demands of the distributing of rewards ,just like
a's reward should more than b's.Dandelion's unclue wants to fulfill all the
demands, of course ,he wants to use the least money.Every work's reward will be
at least 888 , because it's a lucky number.
number of works and the number of demands .(n<=10000,m<=20000)
then m
lines ,each line contains two integers a and b ,stands for a's reward should be
more than b's.
uncle needs to distribute .If it's impossible to fulfill all the works' demands
,print -1.
#include<stdio.h>
#include<string.h>
#include<queue>
#include<vector>
#define MAX 20010
using namespace std;
vector<int>map[MAX];
int vis[MAX];
int reward[MAX];
int n,m,sum;
void getmap()
{
int i,j;
memset(vis,0,sizeof(vis));
for(i=1;i<=n;i++)
map[i].clear();
for(i=1;i<=m;i++)
{
int a,b;
scanf("%d%d",&a,&b);
map[b].push_back(a);
vis[a]++;
}
}
void tuopu()
{
int i,j,ok=0,sum=0;
queue<int>q;
memset(reward,0,sizeof(reward));
while(!q.empty())
q.pop();
for(i=1;i<=n;i++)
if(vis[i]==0)
{
q.push(i);
reward[i]=888;
}
int u,v;
int ans=0;
while(!q.empty())
{
u=q.front();
q.pop();
ans++;
for(i=0;i<map[u].size();i++)
{
v=map[u][i];
vis[v]--;
if(vis[v]==0)
{
q.push(v);
reward[v]=reward[u]+1;
}
}
}
if(ans!=n)
printf("-1\n");
else
{
for(i=1;i<=n;i++)
sum+=reward[i];
printf("%d\n",sum);
}
}
int main()
{
while(scanf("%d%d",&n,&m)!=EOF)
{
getmap();
tuopu();
}
return 0;
}
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