| Time Limit: 1000MS | Memory Limit: 10000K | |
| Total Submissions: 1481 | Accepted: 485 |
Description
Input
Output
Sample Input
3 3 4 1 2 1 3 3 2 1 2 1 3 2 1 3 2 2 1 2 2 1 1 1 1 2 0 0 0
Sample Output
Villa #1 The problem can be solved in 6 steps: - Switch on light in room 2. - Switch on light in room 3. - Move to room 2. - Switch off light in room 1. - Move to room 3. - Switch off light in room 2. Villa #2 The problem cannot be solved.
Source
输入:
10 31 31
9 7
6 8
8 5
6 10
2 9
7 3
9 1
2 10
1 8
10 9
4 1
7 10
2 6
5 4
10 5
7 5
2 3
6 7
2 8
9 4
4 7
5 1
1 3
9 8
10 8
4 8
3 6
8 7
1 2
5 6
3 9
4 9
7 6
3 6
8 2
2 6
7 3
2 8
3 1
3 7
1 2
2 10
9 10
7 8
5 7
6 10
9 7
4 5
9 3
8 6
5 3
6 7
9 8
6 8
3 2
10 5
1 10
2 7
7 1
6 9
10 7
3 8
0 0 0
输出:
Villa #1
The problem can be solved in 12 steps:
- Switch on light in room 2.
- Move to room 2.
- Switch on light in room 7.
- Switch on light in room 8.
- Switch on light in room 10.
- Move to room 8.
- Switch off light in room 2.
- Move to room 7.
- Switch off light in room 1.
- Switch off light in room 8.
- Move to room 10.
- Switch off light in room 7.
代码
#include<iostream>
#include<cstring>
#include<cstdio>
#include<queue>
#include<stack>
#include<vector>
#include<algorithm>
//#include<cmath>
using namespace std;
const int INF = 9999999;
#define LL long long
inline int read(){
int x=0,f=1;char c=getchar();
for(;!isdigit(c);c=getchar()) if(c==‘-‘) f=-1;
for(;isdigit(c);c=getchar()) x=x*10+c-‘0‘;
return x*f;
}
int R,D,S;//room door switch
bool vis[10024][13];
int a,b;
struct data{
int seq,st,ro;//状态,步数,现在所在的房间
bool flag;//0为走路,1为开关灯
int to;//链表的上一个,前驱
int turn;//记录当前开关了几号
}Que[100001];
int l=1,r=1;
bool alflag=false;
bool print(data k){
if(k.to!=-1){//如果不是末尾
if(!print(Que[k.to])) return 1;//这是防止输出move to 1的
if(Que[k.to].flag==1){
if(Que[k.to].turn>0) printf("- Switch on light in room %d.\n",Que[k.to].turn);//注意on与off的区分输出
else printf("- Switch off light in room %d.\n",-Que[k.to].turn);
}
else{
printf("- Move to room %d.\n",Que[k.to].ro);
}
return 1;
}
else return 0;
}
vector<int> pat[13];
vector<int> swa[13];
int cnt;
void BFS(){
Que[l].ro=1,Que[l].seq=2,Que[l].st=0;
Que[l].turn=0;
Que[l].to=-1;
if(Que[r].seq==(1<<R)&&Que[r].ro==R){//处理卧室就是走廊的
alflag=true;
printf("Villa #%d\n",cnt);
printf("The problem can be solved in %d steps:\n",Que[r].st);
return ;
}
int room,Seq,step;
while(l<=r){
step=Que[l].st,Seq=Que[l].seq,room=Que[l].ro;
for(int i=0;i<pat[room].size();i++){//走到另一个房间
if(((Seq>>pat[room][i])&1)==1&&!vis[Seq][pat[room][i]]){//如果此房间的灯是亮着的且此状态没有出现过
vis[Seq][pat[room][i]]=true;//标记此状态出现过
Que[++r].ro=pat[room][i];
Que[r].st=step+1;
Que[r].seq=Seq;
Que[r].to=l;
Que[r].flag=0;//flag=0表示走路
if(Que[r].seq==(1<<R)&&Que[r].ro==R){
alflag=true;
printf("Villa #%d\n",cnt);
printf("The problem can be solved in %d steps:\n",Que[r].st);
print(Que[r]);
printf("- Move to room %d.\n",Que[r].ro);
return ;
}
}
}
for(int i=0;i<swa[room].size();i++){//开/关灯
if(!vis[Seq^(1<<swa[room][i])][room]&&swa[room][i]!=room){//如果不是此房间的灯且此状态没有出现过的
vis[Seq^(1<<swa[room][i])][room]=true;
Que[++r].ro=room;
Que[r].st=step+1;
Que[r].seq=Seq^(1<<swa[room][i]);//更改灯亮的状态
Que[r].to=l;
Que[r].flag=1; //flag=1表示开关灯
if(!((Seq>>swa[room][i])&1)) Que[r].turn=swa[room][i];
else Que[r].turn=-swa[room][i];//负的代表turn off
if(Que[r].seq==(1<<R)&&Que[r].ro==R){
alflag=true;
printf("Villa #%d\n",cnt);
printf("The problem can be solved in %d steps:\n",Que[r].st);
print(Que[r]);//递归输出
if(Que[r].turn>0)
printf("- Switch on light in room %d.\n",Que[r].turn);
else printf("- Switch off light in room %d.\n",-Que[r].turn);
return ;
}
}
}
l++;//不要忘了这个
}
}
int main(){
R=read(),D=read(),S=read();
while(R!=0||D!=0||S!=0){
cnt++;
l=1,r=1;
for(int i=1;i<=11;i++) pat[i].clear(),swa[i].clear();//注意清空
memset(vis,0,sizeof(vis));
for(int i=1;i<=D;i++){
a=read(),b=read();
pat[a].push_back(b);//路是双向的,可能走到下一个房间调了一下状态又回来了
pat[b].push_back(a);
}
for(int i=1;i<=R;i++) sort(pat[i].begin(),pat[i].end(),less<int>());//vector排序,因为没有spj
for(int i=1;i<=S;i++){
a=read(),b=read();
swa[a].push_back(b);
}
for(int i=1;i<=R;i++) sort(swa[i].begin(),swa[i].end(),less<int>());
BFS();
if(!alflag){
printf("Villa #%d\n",cnt);
puts("The problem cannot be solved.");
}
alflag=false;
printf("\n");
R=read(),D=read(),S=read();
}
return 0;
}
原文:http://www.cnblogs.com/wxjor/p/6962079.html