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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 5 15 0 0 0 0 2 0 2 0 0 0 0 1 2 0 1 0 0 0 1 0 2 0 2 2 0 1 2 0 0 0 2 1 0 2 0 1 0 2 0 0 0 0 0 0 0 0 0 0 1 0 2 0 0 1 2 0 0 2 0 0 0 2 1 0 2 0 0 0 0 0 3 0 0 0 0 9 15 2 0 2 2 0 2 0 0 2 0 0 0 0 0 2 0 2 2 2 0 0 0 0 0 2 0 1 0 0 2 2 0 0 1 2 0 3 0 1 0 0 0 0 2 0 2 0 0 2 2 0 0 0 0 0 0 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