hdu1285+hdu2467(拓扑排序)
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确定比赛名次
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 10604 Accepted Submission(s): 4150
Problem Description
有N个比赛队(1<=N<=500),编号依次为1,2,3,。。。。,N进行比赛,比赛结束后,裁判委员会要将所有参赛队伍从前往后依次排名,但现在裁判委员会不能直接获得每个队的比赛成绩,只知道每场比赛的结果,即P1赢P2,用P1,P2表示,排名时P1在P2之前。现在请你编程序确定排名。
Input
输入有若干组,每组中的第一行为二个数N(1<=N<=500),M;其中N表示队伍的个数,M表示接着有M行的输入数据。接下来的M行数据中,每行也有两个整数P1,P2表示即P1队赢了P2队。
Output
给出一个符合要求的排名。输出时队伍号之间有空格,最后一名后面没有空格。
其他说明:符合条件的排名可能不是唯一的,此时要求输出时编号小的队伍在前;输入数据保证是正确的,即输入数据确保一定能有一个符合要求的排名。
其他说明:符合条件的排名可能不是唯一的,此时要求输出时编号小的队伍在前;输入数据保证是正确的,即输入数据确保一定能有一个符合要求的排名。
Sample Input
4 31 22 34 3
Sample Output
1 2 4 3
Author
SmallBeer(CML)
Source
杭电ACM集训队训练赛(VII)
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题解:
本题是道比较裸的拓扑排序题,注意重边就行了,还有本题符合条件的排名可能不是唯一的,此时要求输出时编号小的队伍在,其次就是输出格式的限定!
Total Submission(s): 3580 Accepted Submission(s): 1085
题解:
本题同上也是道比较容易看出的拓扑排序题,不同的建立拓扑结构图是应该逆向见图,这样能够保证前者比后者大。
题解:
本题是道比较裸的拓扑排序题,注意重边就行了,还有本题符合条件的排名可能不是唯一的,此时要求输出时编号小的队伍在,其次就是输出格式的限定!
#include<iostream>#include<cstring>using namespace std;const int MAXN=500+10;int inDev[MAXN];bool visited[MAXN];bool g[MAXN][MAXN];int n,m;void init(){memset(g,0,sizeof(g));memset(visited,0,sizeof(visited));memset(inDev,0,sizeof(inDev));}void input(){int a,b;for(int i=0;i<m;i++){scanf("%d%d",&a,&b);if(!g[a][b]){g[a][b]=true;++inDev[b];}}}void topSort() { int i,tag=0; while(tag<n) { for(i=1;i<=n;i++)if(!visited[i]&&0==inDev[i])break;if(tag)printf(" ");++tag;printf("%d",i);visited[i]=true;for(int j=1;j<=n;j++)if(g[i][j])--inDev[j]; } printf("\n");} int main(){while(scanf("%d%d",&n,&m)!=EOF){init();input();topSort();}return 0;}
Reward
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3580 Accepted Submission(s): 1085
Problem Description
Dandelion's uncle is a boss of a factory. As the spring 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.
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.
Input
One line with two integers n and m ,stands for the 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.
then m lines ,each line contains two integers a and b ,stands for a's reward should be more than b's.
Output
For every case ,print the least money dandelion 's uncle needs to distribute .If it's impossible to fulfill all the works' demands ,print -1.
Sample Input
2 11 22 21 22 1
Sample Output
1777-1
Author
dandelion
Source
曾是惊鸿照影来
本题同上也是道比较容易看出的拓扑排序题,不同的建立拓扑结构图是应该逆向见图,这样能够保证前者比后者大。
#include<iostream>#include<vector>#include<cstring>#include<queue>using namespace std;const int MAXN=10000+10;vector<int>g[MAXN];int inDev[MAXN];int money[MAXN];int n,m;void init(){for(int i=0;i<MAXN;i++){g[i].clear();money[i]=888;}memset(inDev,0,sizeof(inDev));}void input(){int a,b;for(int i=0;i<m;i++){scanf("%d%d",&a,&b);g[b].push_back(a);++inDev[a];}}void topSort(){queue<int>q;int tag=0,ans=0;for(int i=1;i<=n;i++){if(inDev[i]==0)q.push(i);}while(!q.empty()){++tag;int now=q.front();ans+=money[now];q.pop();for(int i=0;i<g[now].size();i++){int next=g[now][i];if(--inDev[next]==0){q.push(next);money[next]=money[now]+1;}}}if(tag!=n)ans=-1;printf("%d\n",ans);}int main(){while(scanf("%d%d",&n,&m)!=EOF){init();input();topSort();}return 0;}
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