传送门

模拟就好！

然后需要把一圈的有楼梯的都记录一下，取膜乱搞。

代码

#include <cstdio>
#include <iostream>
#define N 10001
#define M 101

int n, m, s, t, len, ans;
int a[N][M], pos[N];
bool b[N][M];

inline int read()
{
	int x = 0, f = 1;
	char ch = getchar();
	for(; !isdigit(ch); ch = getchar()) if(ch == ‘-‘) f = -1;
	for(; isdigit(ch); ch = getchar()) x = (x << 1) + (x << 3) + ch - ‘0‘;
	return x * f;
}

int main()
{
	int i, j;
	n = read();
	m = read();
	for(i = 1; i <= n; i++)
		for(j = 0; j < m; j++)
			b[i][j] = read(), a[i][j] = read();
	s = read();
	for(i = 1; i <= n; i++)
	{
		len = 0;
		ans = (ans + a[i][s]) % 20123;
		t = s;
		do
		{
			if(b[i][t]) pos[len++] = t;
			t = t + 1 == m ? 0 : t + 1;
		}
		while(t ^ s);
		s = pos[(a[i][s] - 1) % len];
	}
	printf("%d\n", ans);
	return 0;
}