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Cleaning robot
#pragma warning(disable:4996)
#include<iostream>
using namespace std;
#define MAX 10000
class QueueCir{
int front, rear;
int* x;
int* y;
public:
QueueCir(){
front = -1;
rear = -1;
x = new int[MAX];
y = new int[MAX];
}
void reset(){
front = -1;
rear = -1;
}
bool isEmpty(){
return(front == rear);
}
void enQueue(int x1, int y1){
rear++;
x[rear] = x1;
y[rear] = y1;
}
void deQueue(){
if(isEmpty()){
cout << "Stack underflow" << endl;
return;
}
else{
front++;
}
}
int peekX(){
int temp = front+1;
return x[temp];
}
int peekY(){
int temp = front+1;
return y[temp];
}
~ QueueCir(){
delete[] x;
delete[] y;
}
};
int visited[12][100][100];
int visit[12];
int arr[100][100];
int numDirt;
int n, m;
int minDis;
struct Point{
int x;
int y;
};
Point arr3[12];
int x[] = {1, 0, -1, 0};
int y[] = {0, -1, 0, 1};
int total;
void reset(int index){
for(int i = 0; i< n; i++){
for(int j = 0; j <m; j++){
visited[index][i][j] = -1;
}
}
}
void BFS(int sourceX, int sourceY,int index){
reset(index);
QueueCir Q;
Q.enQueue(sourceX,sourceY);
visited[index][sourceX][sourceY] = total;
int sum = 1;
while(!Q.isEmpty()){
int a = Q.peekX();
int b = Q.peekY();
Q.deQueue();
total = visited[index][a][b];
for(int k = 0; k < 4; k++){
int Xduyet = a + x[k], Yduyet = b + y[k];
if(Xduyet >= 0 && Xduyet <n && Yduyet >= 0 && Yduyet <m && arr[Xduyet][Yduyet]!=2 && visited[index][Xduyet][Yduyet]==-1){
if(arr[Xduyet][Yduyet] == 1 || arr[Xduyet][Yduyet] == 3){
sum +=1;
}
visited[index][Xduyet][Yduyet] = total+1;
if(sum == numDirt) return;
Q.enQueue(Xduyet, Yduyet);
}
}
}
}
void backtrack(int i,int num, int dis){
if(dis > minDis) return;
if(num == numDirt){
if(minDis > dis) minDis = dis;
return;
}
visit[i] = 1;
for(int j = 0; j < numDirt; j++){
if(visit[j] == 0){
backtrack(j, num +1,dis + visited[i][arr3[j].x][arr3[j].y]);
}
}
visit[i] = 0;
}
int main()
{
freopen("input.txt","r",stdin);
int T;
cin >> T;
for(int t = 1; t <=T; t++){
cin>>n >> m;
int x1, y1;
for(int i = 0; i< n; i++){
for(int j = 0; j <m; j++){
arr[i][j] = 0;
}
}
int x, y;
numDirt = 1;
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
int tmp;
cin >> tmp;
arr[i][j] = tmp;
if(tmp == 1){
arr3[numDirt].x = i;
arr3[numDirt].y = j;
numDirt++;
}
if(tmp == 3){
arr3[0].x = i;
arr3[0].y = j;
}
}
}
minDis = 10000;
for(int i = 0; i < numDirt; i++){
total = 0;
BFS(arr3[i].x,arr3[i].y,i);
if(i == 0){
for(int j = 1; j < numDirt; j++){
if(visited[0][arr3[j].x][arr3[j].y] == -1){
minDis = -1;
break;
}
}
}
}
if(minDis == 10000){
for(int i = 0; i< numDirt; i++){
visit[i] = 0;
}
backtrack(0,1,0);
}
/*for(int i = 0; i< n; i++){
for(int j = 0; j <m; j++){
cout << visited[i][j] << " ";
}
cout <<endl;
}*/
cout << "Case #"<<t<<endl;
cout << minDis<<endl;
}
return 0;
}
50
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