Light oj 1074 - Extended Traffic
来源:互联网 发布:任务网站源码 编辑:程序博客网 时间:2024/05/17 03:21
Dhaka city is getting crowded and noisy day by day. Certain roads always remain blocked in congestion. In order to convince people avoid shortest routes, and hence the crowded roads, to reach destination, the city authority has made a new plan. Each junction of the city is marked with a positive integer (≤ 20) denoting the busyness of the junction. Whenever someone goes from one junction (the source junction) to another (the destination junction), the city authority gets the amount (busyness of destination - busyness of source)3 (that means the cube of the difference) from the traveler. The authority has appointed you to find out the minimum total amount that can be earned when someone intelligent goes from a certain junction (the zero point) to several others.
Input
Input starts with an integer T (≤ 50), denoting the number of test cases.
Each case contains a blank line and an integer n (1 < n ≤ 200) denoting the number of junctions. The next line contains n integers denoting the busyness of the junctions from 1 to n respectively. The next line contains an integer m, the number of roads in the city. Each of the next m lines (one for each road) contains two junction-numbers (source, destination) that the corresponding road connects (all roads are unidirectional). The next line contains the integer q, the number of queries. The next q lines each contain a destination junction-number. There can be at most one direct road from a junction to another junction.
Output
For each case, print the case number in a single line. Then print q lines, one for each query, each containing the minimum total earning when one travels from junction 1 (the zero point) to the given junction. However, for the queries that gives total earning less than 3, or if the destination is not reachable from the zero point, then print a '?'.
Sample Input
Output for Sample Input
2
5
6 7 8 9 10
6
1 2
2 3
3 4
1 5
5 4
4 5
2
4
5
2
10 10
1
1 2
1
2
Case 1:
3
4
Case 2:
?
题意:有n个城市,每一个城市有一个拥挤度ai,从一个城市I到另一个城市J的时间为:(aJ-aI)^3,存在负环。问从第一个城市到达第k个城市所话的时间,如果不能到达,或者时间小于3输出?否则输出所花的时间。。
思路:用spfa判负环
#include<cstdio>#include<cstring>#include<string>#include<queue>#include<algorithm>#include<queue>#include<map>#include<stack>#include<iostream>#include<list>#include<set>#include<cmath>#define INF 0x3f#define eps 1e-6#define inf 0x3f3f3f3fusing namespace std;#define maxn 210#define maxm 40010int value[maxn];int dis[maxn];int u[maxm];int v[maxm];int w[maxm];int first[maxn];int conut[maxn];int circle[maxn];int vis[maxn];int nex[maxm];int ans;int case_=1;void add_edge(int u_,int v_,int w_){ u[ans]=u_,v[ans]=v_,w[ans]=w_; nex[ans]=first[u_]; first[u_]=ans; ans++;}int n;int m;int k;void dfs(int x){ circle[x]=1; for(int i=first[x];i!=-1;i=nex[i]) { if(!circle[v[i]]) dfs(v[i]); }}void spfa(int x){ queue<int > Q; while(Q.size()) Q.pop(); memset(vis,0,sizeof(vis)); memset(dis,INF,sizeof(dis)); memset(conut,0,sizeof(conut)); memset(circle,0,sizeof(circle)); Q.push(x); vis[x]=1; dis[x]=0; conut[x]++; while(!Q.empty()) { int t=Q.front(); Q.front(); Q.pop(); vis[t]=0; for(int i=first[t];i!=-1;i=nex[i]) { if(dis[v[i]]>dis[t]+w[i]) { dis[v[i]]=dis[t]+w[i]; if(!vis[v[i]] && !circle[v[i]]) Q.push(v[i]),conut[v[i]]++; if(conut[v[i]]>=n && !circle[v[i]]) dfs(v[i]); } } }}int main(){ int T; cin>>T; while(T--) { ans=0; memset(first,-1,sizeof(first)); scanf("%d",&n); for(int i=1;i<=n;i++) scanf("%d",&value[i]); scanf("%d",&m); while(m--) { int aa,bb; scanf("%d%d",&aa,&bb); add_edge(aa,bb,(value[bb]-value[aa])*(value[bb]-value[aa])*(value[bb]-value[aa])); } spfa(1); scanf("%d",&k); printf("Case %d:\n",case_++); while(k--) { int aa; scanf("%d",&aa); if(circle[aa] || dis[aa]<3 || dis[aa]==inf) printf("?\n"); else printf("%d\n",dis[aa]); } } return 0;}
- Light oj 1074 - Extended Traffic
- Light oj 1074 - Extended Traffic SPFA+负权环判断
- LightOJ 1074 - Extended Traffic
- LightOJ-1074 Extended Traffic
- LightOJ 1074 Extended Traffic SPFA
- LightOJ 1074 - Extended Traffic (SPFA负环)
- LightOJ 1074 – Extended Traffic 【SPFA判负环】
- LightOJ - 1074 Extended Traffic(负环)
- SPFA判负环-LightOJ-1074-Extended Traffic
- LightOJ 1074 Extended Traffic spfa+邻接表
- lightoj 1074 - Extended Traffic(SPFA模板)
- Light OJ 1291 Real Life Traffic 双连通最少添边数
- LightOJ 1074 O - Extended Traffic(SPFA判断负环)
- o LightOJ 1074 Extended Traffic (SPFA判断负环)
- LightOJ 1074 Extended Traffic(SPFA+负环)
- Extended Traffic(spfa判负环)
- Light OJ 1291 - Real Life Traffic (构造双连通图)
- light oj 1281 - New Traffic System (最短路+dp思想)
- java String字符串
- 数据结构和算法系列 - 八大排序算法
- 可以滑动的视频播放器(VideoView)
- 接入httpDNS
- 使用FragmentActivity做成类新闻APP样式
- Light oj 1074 - Extended Traffic
- SBT(Size Balanced Tree平衡树的一种)
- 使用DOM方式解析XML
- HIVE(上)
- Windows下操作注册表
- iiOS 上线后去掉打印
- 上传项目到github并供团队克隆
- 快速理解 .bss、.data和.rodata
- python中的编解码攻略