uva 1589 - Xiangqi

把所有红方的攻击范围标记出来，判断黑方四个方向是否在红方范围内
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define maxn 100 + 10
#define INF 0x7fffffff
using namespace std;
struct NODE
{
    char ch[3];
    int x, y;
}a[10];
int g[20][20];
bool vis[20][20];
bool inxy(int x, int y)
{
    if(x <= 10 && x >= 1 && y <= 9 && y >= 1) return true;
    return false;
}
bool inc(int x, int y)
{
    if(x >= 1 && x <= 3 && y >= 4 && y <= 6) return true;
    return false;
}
void check_G(int x, int y)
{
    for(int i = x-1; i >= 1; --i)
    {
        if(g[i][y]) {vis[i][y] = true; break;}
        vis[i][y] = true;
    }
    return;
}
void check_R(int x, int y)
{
    for(int i = y+1; i <= 9; ++i)//right
    {
        if(g[x][i]) {vis[x][i] = true; break;}
        vis[x][i] = true;
    }
    for(int i = y-1; i >= 1; --i)//left
    {
        if(g[x][i]) {vis[x][i] = true; break;}
        vis[x][i] = true;
    }
    for(int i = x-1; i >= 1; --i)//up
    {
        if(g[i][y]) {vis[i][y] = true; break;}
        vis[i][y] = true;
    }
    for(int i = x+1; i <= 10; ++i)//down
    {
        if(g[i][y]) {vis[i][y] = true; break;}
        vis[i][y] = true;
    }
    return;
}
void check_H(int x, int y)
{
    if(!g[x-1][y]) {//up
        int dx = x-2;
        int dy = y-1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
        dy = y+1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
    }
    //down
    if(!g[x+1][y]){
        int dx = x+2;
        int dy = y-1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
        dy = y+1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
    }

    if(!g[x][y+1]) {//right
        int dx = x+1;
        int dy = y+2;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
        dx = x-1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
    }

    if(!g[x][y-1]) {//left
        int dx = x-1;
        int dy = y-2;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
        dx = x+1;
        if(inxy(dx, dy))
            vis[dx][dy] = true;
    }
    return;
}
void check_C(int x, int y)
{
    for(int i = x-1; i >= 1; --i)//up
    {
        if(g[i][y]){
            for(int j = i-1; j >= 1; --j)
            {
                if(g[j][y]) {vis[i][y] = true; break;}
                vis[j][y] = true;
            }
            break;
        }
    }
    for(int i = x+1; i <= 10; ++i)//down
    {
        if(g[i][y]){
            for(int j = i+1; j <= 10; ++j)
            {
                if(g[j][y]) {vis[j][y] = true; break;}
                vis[j][y] = true;
            }
            break;
        }
    }

    for(int i = y-1; i >= 1; --i)//left
    {
        if(g[x][i]){
            for(int j = i-1; j >= 1; --j)
            {
                if(g[x][j]) {vis[x][j] = true; break;}
                vis[x][j] = true;
            }
            break;
        }
    }
    for(int i = y+1; i <= 9; ++i)//right
    {
        if(g[x][i]){
            for(int j = i+1; j <= 9; ++j)
            {
                if(g[x][j]) {vis[x][j] = true; break;}
                vis[x][j] = true;
            }
            break;
        }
    }
    return;
}
bool ok(int x, int y)
{
    int dx = x+1;
    int dy = y;
    if(inc(dx, dy) && !vis[dx][dy])//down
        return true;
    dx = x-1;
    if(inc(dx, dy) && !vis[dx][dy])//up
        return true;
    dx = x;
    dy = y-1;
    if(inc(dx, dy) && !vis[dx][dy])//left
        return true;
    dy = y+1;
    if(inc(dx, dy) && !vis[dx][dy])//right
        return true;
    return false;
}
int main()
{
    int n, x, y, z;
    while(scanf("%d%d%d", &n, &x, &y) != EOF)
    {
        if(!n && !x && !y) break;
        memset(vis, false, sizeof(vis));
        memset(g, 0, sizeof(g));
        for(int i = 0; i < n; ++i)
        {
            scanf("%s%d%d", a[i].ch, &a[i].x, &a[i].y);
            g[a[i].x][a[i].y] = 1;
        }
        for(int i = 0; i < n; ++i)
        {
            if(a[i].ch[0] == 'G')
                check_G(a[i].x, a[i].y);
            else if(a[i].ch[0] == 'R')
                check_R(a[i].x, a[i].y);
            else if(a[i].ch[0] == 'C')
                check_C(a[i].x, a[i].y);
            else if(a[i].ch[0] == 'H')
                check_H(a[i].x, a[i].y);
        }
        if(ok(x, y)) puts("NO");
        else puts("YES");
    }
    return 0;
}