水题，P1789 【Mc生存】插火把 （暴力即可）

#include<cstdio>
#define maxn int(1e4)
bool dp[maxn][maxn];
int n;

void f1(int x, int y)
{
    dp[x][y] = ;
    int i = x + , j = y;
    int k = ;
    while ()
    {
        ++k;
        if (i >  && i <= n&&j >  && j <= n)dp[i][j] = ;
        if (k ==  || k == )++j;
        else --j;
        if (k ==  || k == )--i;
        else ++i;
        if (i == x +  && j == y)break;
    }
    i = x + ; j = y; k = ;
    while ()
    {
        ++k;
        if (i >  && i <= n&&j >  && j <= n)dp[i][j] = ;
        if (k ==||k==||k==||k==)++j;
        else --j;
        if (k ==  || k ==  || k ==  || k == )++i;
        else --i;
        if (i == x +  && j == y)break;
    }
}

void f2(int x, int y)
{
    for (int i = x - ; i <= x + ;++i)
    for (int j = y - ; j <= y + ;++j)
    if (i >  && i <= n&&j >  && j <= n)dp[i][j] = ;
}

int main()
{
    int k, t;
    scanf("%d%d%d", &n, &k, &t);
    for (int i = ; i < k; ++i)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        f1(y, x);
    }
    for (int i = ; i < t; ++i)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        f2(y, x);
    }
    int ans = ;

//    for (int i = 1; i <= n; ++i)
//    {
//        for (int j = 1; j <= n; ++j)
//        if (dp[i][j])printf("*");
//        else printf(".");
//        printf("\n");
//    }
    for (int i = ; i <= n;++i)
    for (int j = ; j <= n;++j)
    if (!dp[i][j])++ans;
    printf("%d\n", ans);
}