HDU 4740 The Donkey of Gui Zhou (模拟)

由于一开始考虑的很不周到，找到很多bug.....越改越长，不忍直视。 不是写模拟的料......................

反正撞墙或者碰到已经走过的点就会转向，转向后还碰到这两种情况就会傻站那不动了......

 

#include <iostream>

#include <algorithm>

#include <cmath>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <string>

#include <vector>

#include <set>

#include <queue>

#include <stack>

#include <climits>//形如INT_MAX一类的

#define MAX 1111



using namespace std;



int vis1[MAX][MAX];

int vis2[MAX][MAX];

int step1[MAX][MAX];

int step2[MAX][MAX];

int dx[] = {0,1,0,-1};

int dy[] = {1,0,-1,0};

struct node {

    int x,y,dir,kind;

} q[1011111],st,end,ans,stop;

int head,tail,n,yes;

int flag1 , flag2;



bool inside(int x,int y) {

    if(x >= 0 && x < n && y >= 0 && y < n) return true;

    return false;

}



bool ok(int x,int y,int kind) {

    if(kind == 1 && vis1[x][y] == 0) return true;

    if(kind == 2 && vis2[x][y] == 0) return true;

    return false;

}



void init() {

    memset(vis1,0,sizeof(vis1));

    memset(vis2,0,sizeof(vis2));

    memset(step1,-1,sizeof(step1));

    memset(step2,-1,sizeof(step2));

    head = 0;

    tail = 0;

    yes = 0;

    flag1 = 0;

    flag2 = 0;

    stop.x = -1;

    stop.y = -1;

}



void getstop(node t,node tt) {

    stop.x = t.x;

    stop.y = t.y;

    if(tt.kind == 1) flag1 = 1,stop.kind = 1;

    if(tt.kind == 2) flag2 = 1,stop.kind = 2;

}



void bfs() {

    vis1[st.x][st.y] = 1;

    vis2[end.x][end.y] = 1;

    step1[st.x][st.y] = 0;

    step2[end.x][end.y] = 0;

    q[head++] = st;

    q[head++] = end;

    while(head != tail) {

        node t = q[tail++];

        //cout << t.x << ' ' << t.y << endl;

        if(step1[t.x][t.y] == step2[t.x][t.y] && step1[t.x][t.y] != -1) {

            ans.x = t.x;

            ans.y = t.y;

            yes = 1;

            return ;

        }

        if(t.x == stop.x && t.y == stop.y && t.kind != stop.kind) {

            ans.x = t.x;

            ans.y = t.y;

            yes = 1;

            return ;

        }

        if(flag1 == 1 && flag2 == 1) {

            ans.x = -1;

            return ;

        }

        node tt = t;

        tt.x = t.x + dx[t.dir];

        tt.y = t.y + dy[t.dir];



        if(inside(tt.x,tt.y)) {

            if(ok(tt.x,tt.y,tt.kind)) {

                if(tt.kind == 1) vis1[tt.x][tt.y] = 1, step1[tt.x][tt.y] = step1[t.x][t.y] + 1;

                if(tt.kind == 2) vis2[tt.x][tt.y] = 1, step2[tt.x][tt.y] = step2[t.x][t.y] + 1;

                q[head++] = tt;

            } else {

                if(tt.kind == 1) {

                    if(tt.dir == 3) tt.dir = 0;

                    else tt.dir ++;

                    tt.x = t.x + dx[tt.dir];

                    tt.y = t.y + dy[tt.dir];

                    if(vis1[tt.x][tt.y] == 0) {

                        vis1[tt.x][tt.y] = 1;

                        step1[tt.x][tt.y] = step1[t.x][t.y] + 1;

                        q[head++] = tt;

                    } else getstop(t,tt);



                }

                if(tt.kind == 2) {

                    if(tt.dir == 0) tt.dir = 3;

                    else tt.dir --;

                    tt.x = t.x + dx[tt.dir];

                    tt.y = t.y + dy[tt.dir];

                    if(vis2[tt.x][tt.y] == 0) {

                        vis2[tt.x][tt.y] = 1;

                        step2[tt.x][tt.y] = step2[t.x][t.y] + 1;

                        q[head++] = tt;

                    } else getstop(t,tt);

                }

            }

        } else {

            if(tt.x < 0) {

                if(tt.kind == 1) {

                    tt.dir = 0;

                    tt.x = t.x + dx[0];

                    tt.y = t.y + dy[0];

                } else {

                    tt.dir = 2;

                    tt.x = t.x + dx[2];

                    tt.y = t.y + dy[2];

                }

            } else if(tt.x >= n) {

                if(tt.kind == 1) {

                    tt.dir = 2;

                    tt.x = t.x + dx[2];

                    tt.y = t.y + dy[2];

                } else {

                    tt.dir = 0;

                    tt.x = t.x + dx[0];

                    tt.y = t.y + dy[0];

                }

            } else if(tt.y < 0) {

                if(tt.kind == 1) {

                    tt.dir = 3;

                    tt.x = t.x + dx[3];

                    tt.y = t.y + dy[3];

                } else {

                    tt.dir = 1;

                    tt.x = t.x + dx[1];

                    tt.y = t.y + dy[1];

                }

            } else if(tt.y >= n) {

                if(tt.kind == 1) {

                    tt.dir = 1;

                    tt.x = t.x + dx[1];

                    tt.y = t.y + dy[1];

                } else {

                    tt.dir = 3;

                    tt.x = t.x + dx[3];

                    tt.y = t.y + dy[3];

                }

            }

            if(inside(tt.x,tt.y)) {

                if(ok(tt.x,tt.y,tt.kind)) {

                    if(tt.kind == 1) vis1[tt.x][tt.y] = 1, step1[tt.x][tt.y] = step1[t.x][t.y] + 1;

                    if(tt.kind == 2) vis2[tt.x][tt.y] = 1, step2[tt.x][tt.y] = step2[t.x][t.y] + 1;

                    q[head++] = tt;

                } else getstop(t,tt);



            } else getstop(t,tt);

        }

    }

}



int main() {

    while(scanf("%d",&n) && n) {

        init();

        scanf("%d%d%d",&st.x,&st.y,&st.dir);

        st.kind = 1;

        scanf("%d%d%d",&end.x,&end.y,&end.dir);

        end.kind = 2;



        bfs();

        if(ans.x == -1 || yes == 0) {

            printf("-1\n");

        } else {

            printf("%d %d\n",ans.x,ans.y);

        }

    }

    return 0;

}