UVA816Abbott'sRevenge

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//UVA816Abbott'sRevenge#include<cstdio>#include<cstdlib>#include<iostream>#include<queue>#include<vector>#include<cstring>//#define LOCALusing namespace std;struct dot {int r, c, face_ID;dot(int r = 0, int c = 0, int face_ID = 0) : r(r), c(c), face_ID(face_ID) {}};const int MAXR = 10 + 10;const int MAXC = 10 + 10;char title[100];int r0, c0, r1, c1, r2, c2;char faced0[100];int got[MAXR][MAXC][10][10];int d[MAXR][MAXC][10];//记录出发点到该点的距离dot father[MAXR][MAXC][10];//记录该点上一个点的信息 dot G0, G1;const char* faces = "NESW";const char* go = "LRF";const int dr[] = {-1, 0, 1, 0};const int dc[] = {0, 1, 0, -1};int tra_fac(char c) {return strchr(faces, c) - faces;}//面对方向的数字转换 int tra_go(char c) {return strchr(go, c) - go;}//转向操作的数字转换 bool read() {//读入数据 memset(got, 0, sizeof(got));    memset(d, -1, sizeof(d));    //memset(father, -1, sizeof(father));    scanf("%s", title);    if(!strcmp(title, "END")) return false;scanf("%d", &r0); scanf("%d%s%d%d", &c0, faced0, &r2, &c2);G0.c = c0; G0.r = r0; G0.face_ID = tra_fac(faced0[0]);//printf("G0.r = %d, c = %d\n", G0.r, G0.c);    G1.c = c0 + dc[G0.face_ID]; G1.r = r0 + dr[G0.face_ID]; G1.face_ID = tra_fac(faced0[0]);    //printf("G0.face_ID = %d\n", G0.face_ID);    //printf("G1.r = %d, c = %d\n", G1.r, G1.c);int tmp_r, tmp_c;    char tmp_s[100];    while(scanf("%d", &tmp_r)) {if(tmp_r == 0) return true;//输入结束 scanf("%d", &tmp_c);while(scanf("%s", tmp_s) && tmp_s[0] != '*') {for(int i = 1; i < strlen(tmp_s); i++) {//printf("tmp_s = %s\n", tmp_s);int fa = tra_fac(tmp_s[0]), tmp_got = tra_go(tmp_s[i]);//printf("tmp_r = %d, tmp_c = %d, fa = %d, tmp_got = %d\n", tmp_r, tmp_c, fa, tmp_got);got[tmp_r][tmp_c][fa][tmp_got] = 1;//printf("***********\n");//标记可行路 }}}return true;}dot walk(dot former, int turn) {//探索下一个结点可能的位置 int tmp_faced = former.face_ID;if(turn == 0) tmp_faced = (tmp_faced + 3) % 4;//逆时针,防越界      if(turn == 1) tmp_faced = (tmp_faced + 1) % 4;//顺时针,防越界    return dot(former.r + dr[tmp_faced], former.c + dc[tmp_faced], tmp_faced);}int Islegal(int r, int c) {return r <= 9 && r >= 1 && c <= 9 && c >= 1;}void got_ans(dot terminal) {vector<dot> ans;ans.push_back(terminal);dot tmp = terminal;while(d[tmp.r][tmp.c][tmp.face_ID] > 0) {//printf("(%d, %d) : d = %d\n", tmp.r, tmp.c, d[tmp.r][tmp.c][tmp.face_ID]);tmp = father[tmp.r][tmp.c][tmp.face_ID];ans.push_back(tmp);}//ans.push_back(tmp);ans.push_back(G0);printf("%s\n", title);int i = 0;for(i = 1; i <= ans.size() ; i++) {if(i % 10 == 1) printf(" ");printf(" ");printf("(%d,%d)", ans[ans.size() - i].r, ans[ans.size() - i].c);if(i % 10 == 0) printf("\n");}if(i % 10 != 1) printf("\n");}bool solve() {queue<dot> routine;//routine.push(G1);//BFSd[G1.r][G1.c][G1.face_ID] = 0;while(!routine.empty()) {dot tmp_routine = routine.front(); routine.pop();//printf("tmp_routine.r = %d, c = %d\n", tmp_routine.r, tmp_routine.c);if(tmp_routine.r == r2 && tmp_routine.c == c2) {got_ans(tmp_routine); return true;}for(int i = 0; i < 3; i++) {//探索每个方向 dot tmp = walk(tmp_routine, i);if(Islegal(tmp.r, tmp.c) && got[tmp_routine.r][tmp_routine.c][tmp_routine.face_ID][i] && d[tmp.r][tmp.c][tmp.face_ID] < 0) {//行走未越界,可达,此方向的此点未被访问过     d[tmp.r][tmp.c][tmp.face_ID] = d[tmp_routine.r][tmp_routine.c][tmp_routine.face_ID] + 1;     father[tmp.r][tmp.c][tmp.face_ID] = tmp_routine;     routine.push(tmp);}}}printf("%s\n", title);printf("  No Solution Possible\n");}int main() {#ifdef LOCALfreopen("UVA816in.txt", "r", stdin);freopen("UVA816out.txt", "w", stdout);#endifwhile(read()) {solve();}}/*SAMPLE3 3 N 3 31 1 WL NR *1 2 WLF NR ER *1 3 NL ER *2 1 SL WR NF *2 2 SL WF ELF *2 3 SFR EL *0*/

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