Submission

Score: 100

User: agnes_chan

Problemset: ลำแสงเลเซอร์สะท้อน

Language: python

Time: 0.097 second

Submitted On: 2026-05-08 13:20:31

m , n , cnt = map(int,input().split()+[1])
r = [0]+list(map(int,input().split()))
b = list(map(int,[0]+input().split()))
for i in range(m):
    l1 , r1 = r[i] , r[1+i]
    for j in range(n):
        l2 , r2 = b[j:j+2]
        if i&1!=j%2 and l1<r2 and l2<r1: cnt += 1
        else: cnt += (l1<l2 and r2<=r1) | (l1>l2 and r2>=r1)
print(cnt)