HDU 4121

http://www.bnuoj.com/v3/problem_show.php?pid=10277

 //#pragma comment(linker, "/STACK:16777216") //for c++ Compiler
 #include <stdio.h>
 #include <iostream>
 #include <climits>
 #include <cstring>
 #include <cmath>
 #include <stack>
 #include <vector>
 #include <algorithm>
 #define ll long long
 using namespace std;

 const int INF = 0x3f3f3f3f;
 const int MAXN = ;
 const int row = ;
 const int col = ;

 int map[][];
 int G_x, G_y, pos_x, pos_y;
 bool ans;

 bool deal(int x, int y){
     return (x >=  && x <= row && y >=  && y <= col);
 }

 bool deal_plus(int x, int y){
     if(deal(x, y) && x <=  && y >=  && y <= )    return true;
     return false;
 }

 void init(){
     ans = false;
     memset(map, , sizeof(map));
 }

 bool shuai(int x, int y){
     int i, j;
     if(x -  < pos_x)   return false;
     for(i = x - ; i >= pos_x; --i){
         if(map[i][y]) break;
     }
     if(map[i][y] == )  return true;
     return false;
 }

 bool ju(int x, int y){
     int i, j;
     for(i = x + ; i <= pos_x; ++i){
         if(x +  > pos_x)   break;
         if(map[i][y]){
             if(map[i][y] == )  return true;
             else break;
         }
     }
     for(i = x - ; i >= ; --i){
         if(x -  < )   break;
         if(map[i][y]){
             if(map[i][y] == )  return true;
             else break;
         }
     }
     for(j = y - ; j >= ; --j){
         if(y -  < )   break;
         if(map[x][j]){
             if(map[x][j] == )  return true;
             else break;
         }
     }
     for(j = y + ; j <= col; ++j){
         if(y +  > col) break;
         if(map[x][j]){
             if(map[x][j] == )  return true;
             else break;
         }
     }
     return false;
 }

 bool pao(int x, int y){
     bool flag = false;
     int i, j;
     for(i = x + ; i <= pos_x; ++i){
         if(x +  > pos_x)   break;
         if(flag){
             if(map[i][y] ==  ) return true;
             else break;
         } else if(map[i][y]){
             flag = true;
         }
     }
     flag = false;
     for(i = x - ; i >= ; --i){
         if(x -  < )   break;
         if(flag){
             if(map[i][y] == )  return true;
             else break;
         } else if(map[i][y]){
             flag = true;
         }
     }
     flag = false;
     for(j = y - ; j >= ; --j){
         if(y -  < )   break;
         if(flag){
             if(map[x][j] == )  return true;
             else break;
         } else if(map[x][j]){
             flag = true;
         }
     }
     flag = false;
     for(j = y + ; j <= col; ++j){
         if(y +  > col) break;
         if(flag){
             if(map[x][j] == )  return true;
             else break;
         } else if(map[x][j]){
             flag = true;
         }
     }
     return false;
 }

 bool ma(int x, int y){
     int xx, yy;

     xx = x + ; yy = y - ;
     if(xx == pos_x && yy == pos_y && map[x + ][y] == )    return true;

     xx = x + ; yy = y + ;
     if(xx == pos_x && yy == pos_y && map[x + ][y] == )    return true;

     xx = x + ; yy = y + ;
     if(xx == pos_x && yy == pos_y && map[x][y + ] == )    return true;

     xx = x - ; yy = y + ;
     if(xx == pos_x && yy == pos_y && map[x][y + ] == )    return true;

     xx = x - ; yy = y + ;
     if(xx == pos_x && yy == pos_y && map[x - ][y] == )    return true;

     xx = x - ; yy = y - ;
     if(xx == pos_x && yy == pos_y && map[x - ][y] == )    return true;

     xx = x - ; yy = y - ;
     if(xx == pos_x && yy == pos_y && map[x][y - ] == )    return true;

     xx = x + ; yy = y - ;
     if(xx == pos_x && yy == pos_y && map[x][y - ] == )    return true;

     return false;
 }

 bool beat(int x, int y){
     int i, j;
     if(x +  > row) return false;
     for(i = x + ; i <= row; ++i){
         if(map[i][y]) break;
     }
     if(map[i][y] == )  return true;
     return false;
 }

 bool solve(){
     int i, j;
     for(i = ; i <= row; ++i){
         for(j = ; j <= col; ++j){
             if(map[i][j] == )
                 if(shuai(i, j)) return true;
             if(map[i][j] == )
                 if(ju(i, j))    return true;
             if(map[i][j] == )
                 if(pao(i, j))   return true;
             if(map[i][j] == )
                 if(ma(i, j))    return true;
         }
     }
     return false;
 }

 int main(){
     int i, j, t;
     char cc;
     while(cin >> t >> G_x >> G_y){
         if(t ==  && G_x ==  && G_y == )    break;
         init();
         map[G_x][G_y] = ;
         while(t--){
             cin >> cc >> pos_x >> pos_y;
             if(cc == 'G'){
                 map[pos_x][pos_y] = ;
             } else if(cc == 'R'){
                 map[pos_x][pos_y] = ;
             } else if(cc == 'C'){
                 map[pos_x][pos_y] = ;
             } else if(cc == 'H'){
                 map[pos_x][pos_y] = ;
             }
         }
         if(beat(G_x, G_y)){
             ans = false;
         }
         else{
             if(deal_plus(G_x - , G_y)){
                 map[G_x][G_y] = ;
                 int temp_num = map[G_x - ][G_y];
                 map[G_x - ][G_y] = ;
                 pos_x = G_x - ;
                 pos_y = G_y;

                 if(solve()){
                     ans = true;
                 }
                 else{
                     printf("NO\n");
                     continue;
                 }
                 map[G_x - ][G_y] = temp_num;
                 map[G_x][G_y] = ;
             }
             if(deal_plus(G_x + , G_y)){
                 map[G_x][G_y] = ;
                 int temp_num = map[G_x + ][G_y];
                 map[G_x + ][G_y] = ;
                 pos_x = G_x + ;
                 pos_y = G_y;

                 if(solve()){
                     ans = true;
                 }
                 else{
                     printf("NO\n");
                     continue;
                 }
                 map[G_x + ][G_y] = temp_num;
                 map[G_x][G_y] = ;
             }
             if(deal_plus(G_x, G_y - )){
                 map[G_x][G_y] = ;
                 int temp_num = map[G_x][G_y - ];
                 map[G_x][G_y - ] = ;
                 pos_x = G_x;
                 pos_y = G_y - ;

                 if(solve()){
                     ans = true;
                 }
                 else{
                     printf("NO\n");
                     continue;
                 }
                 map[G_x][G_y - ] = temp_num;
                 map[G_x][G_y] = ;
             }
             if(deal_plus(G_x, G_y + )){
                 map[G_x][G_y] = ;
                 int temp_num = map[G_x][G_y + ];
                 map[G_x][G_y + ] = ;
                 pos_x = G_x;
                 pos_y = G_y + ;

                 if(solve()){
                     ans = true;
                 }
                 else{
                     printf("NO\n");
                     continue;
                 }
                 map[G_x][G_y + ] = temp_num;
                 map[G_x][G_y] = ;
             }
         }
         if(ans){
             printf("YES\n");
         } else{
             printf("NO\n");
         }
     }
     return ;
 }