花一天時間寫的一個連連看,唉!分支限界有的關(guān)鍵點,還是不是掌握的很清楚,居然搞那么長時間,應(yīng)該 在3個小時之內(nèi)輕松拿下的,加油了 // MyLinkup.cpp : Defines the entry point for the console application. // #include "stdafx.h" //grid's intial size const int nSize = 8; struct Point{ int x; int y; Point(){this->x = INT_MAX;this->y = INT_MAX; } bool operator==(Point x){return this->x==x.x && this->y==x.y; } };//grid point struct GridPoint{ Point c; int Len; int Cross; //Cross is definitely ascending order, how about Len? //Dijkstra algorithm GridPoint(){this->Len = INT_MAX;this->Cross = INT_MAX; } int operator<(GridPoint item){if(this->Cross < item.Cross)return true;if(this->Cross > item.Cross)return false;//==return this->Len < item.Len; } int operator>(GridPoint item){if(this->Cross > item.Cross)return true;if(this->Cross < item.Cross)return false;//==return this->Len > item.Len; } }; //ms solution, keep to backtrack struct MinPoint{ int MinCross; double MinLen; MinPoint(){this->MinCross = INT_MAX;this->MinLen = DBL_MAX; } }; //implementation int** Intial(int** grid, const int type, const int count, vector<Point>& _pre); void Linkup(int** grid, vector<Point>& _pre, const int type, const int count); bool FindPath(int** grid, const int type, const int count, Point start, Point end); void PrintOut(int** grid); double dis(int x, int y, int x1, int y1){ return abs( x - x1 ) + abs( y - y1 ); } int** Intial(int** grid, const int type, const int count, vector<Point>& _pre){ int* v = new int[type](); for(int i = 0; i < type; i++)v = count; //rand() for select abitrary type srand((unsigned)time(0)); int RANGE_MIN = 0, RANGE_MAX = type;//end can't reach int POINT_MIN = 0, POINT_MAX = nSize; for(int total = count * type; total > 0; ){//select the typeint ctype = 0;for(ctype = ( (double)rand() / (double)RAND_MAX ) * RANGE_MAX + RANGE_MIN;;){if(v[ctype] != 0)break;else{ctype = ( (double)rand() / (double)RAND_MAX ) * RANGE_MAX + RANGE_MIN;}}//for[j]Point n;n.x = ( (double)rand() / (double)RAND_MAX ) * POINT_MAX + POINT_MIN;n.y = ( (double)rand() / (double)RAND_MAX ) * POINT_MAX + POINT_MIN;if(find(_pre.begin(), _pre.end(), n)==_pre.end()){//can't findgrid[n.x][n.y] = ctype + 1;v[ctype]--;total--;_pre.push_back(n);} } return grid; }void Linkup(int** grid, vector<Point>& _pre, const int type, const int count){ while(_pre.size() > 0){//enter the logicint pair = 0, x = 0, y = 0;Point start, end;cout<<endl;while((pair += scanf("%d,%d", &x, &y)) <= 4){fflush(stdin);if(x>-1&&x<nSize&&y>-1&&y<nSize&&grid[x][y]){if(pair==2){start.x = x;start.y = y;}else{if(start.x != x || start.y != y){end.x = x;end.y = y;break;}else{pair -= 2;cout<<" start mustn't be equal with end"<<endl;}}}else{pair -= 2;cout<<" invalid"<<endl;}}//get valid start and end positionif(grid[start.x][start.y] == grid[end.x][end.y]){//check if find the found or notif(FindPath(grid, type, count, start, end)){//erase i and jvector<Point>::iterator i = find(_pre.begin(), _pre.end(), start);if(i!=_pre.end())_pre.erase(i);vector<Point>::iterator j = find(_pre.begin(), _pre.end(), end);if(j!=_pre.end())_pre.erase(j);//erase the current pointgrid[start.x][start.y] = 0;grid[end.x][end.y] = 0;PrintOut(grid);}elsecout<<" no path to reach"<<endl;}elsecout<<" not equal"<<endl; } }bool FindPath(int** grid, const int type, const int count, Point start, Point end){ //offset Point offset[4]; offset[0].x = -1; offset[0].y = 0; //left offset[1].x = 1; offset[1].y = 0; //right; offset[2].x = 0; offset[2].y = -1; //up offset[3].x = 0; offset[3].y = 1;//down int NumofNbrs = 4; //step information structure GridPoint here, nbr; here.Len = 0; here.c = start; here.Cross = -1; //backtrack array MinPoint** track = new MinPoint*[nSize](); for(int i = 0; i < nSize; i++)track = new MinPoint[nSize](); track[start.x][start.y].MinCross = -1; track[start.x][start.y].MinLen = 0; //previous step information Point** pre = new Point*[nSize](); for(int i = 0; i < nSize; i++)pre = new Point[nSize](); pre[start.x][start.y].x = -1; pre[start.x][start.y].y = -1; //if we have step the grid or not? bool** step = new bool*[nSize](); for(int i = 0; i < nSize; i++)step = new bool[nSize](); MinHeap<GridPoint> Q; Q.Insert(here); while(Q.size() > 0){here = Q.DeleteMin(); //judge path for(int i = 0 ; i < NumofNbrs; i++){//offsetint x = here.c.x + offset.x;int y = here.c.y + offset.y;for(;x>-1&&x<nSize&&y>-1&&y<nSize; x += offset.x, y += offset.y){nbr.c.x = x;nbr.c.y = y;if(track[x][y].MinCross > track[here.c.x][here.c.y].MinCross + 1 ||( track[x][y].MinCross == track[here.c.x][here.c.y].MinCross + 1 && track[x][y].MinLen > track[here.c.x][here.c.y].MinLen + dis(x, y, here.c.x, here.c.y) ) ){//update informationtrack[x][y].MinCross = track[here.c.x][here.c.y].MinCross + 1;if(track[x][y].MinLen > track[here.c.x][here.c.y].MinLen + dis(x, y, here.c.x, here.c.y))track[x][y].MinLen = track[here.c.x][here.c.y].MinLen + dis(x, y, here.c.x, here.c.y); pre[x][y].x = here.c.x;pre[x][y].y = here.c.y;}if(grid[x][y]!=0){//first non-space, break;break;}else{if(!step[x][y]){//set the priority informationnbr.Cross = track[x][y].MinCross;nbr.Len = track[x][y].MinLen;//set step informationstep[x][y] = true;Q.Insert(nbr);}}}if(nbr.c == end)break;}//forif(nbr.c == end)break; } cout<<nbr.c.x<<","<<nbr.c.y<<" "<<nbr.Len<<"[Len] "<<nbr.Cross<<"[Cross] "<<endl; if(nbr.c.x == end.x && nbr.c.y == end.y && nbr.Cross <= 3){//print pathcout<<" Path : ";for(int x = nbr.c.x, y = nbr.c.y; x != -1 && y != -1;){cout<<"("<<x<<","<<y<<")";int px = pre[x][y].x;int py = pre[x][y].y;x = px;y = py;if(x!=-1&&y!=-1)cout<<" <- ";else break;}cout<<endl;return true; } return false; } void PrintOut(int** grid){ for(int i = 0; i < nSize; i++){for(int j = 0; j < nSize; j++){if(grid[j]==0)cout<<" ";else cout<<grid[j]<<" ";}cout<<"| x = "<<i<<endl; } } int _tmain(int argc, _TCHAR* argv[]) { //initialization for grid int** grid = new int*[nSize](); for(int i = 0; i < nSize; i++)grid = new int[nSize](); vector<Point> _pre; //call intial grid = Intial(grid, 5, 4, _pre); PrintOut(grid); Linkup(grid, _pre, 5, 4); QUIT(); return 0; }

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