Submission #217048

#	Time	Username	Problem	Language	Result	Execution time	Memory
217048		sevlll	Strange Device (APIO19_strange_device)	Pypy 2	0 / 100	27 ms	4960 KiB

strange_device

from math import gcd
from sys import exit
n, a, b = map(int, input().split())
pr = []
for i in range(n):
    x, y = map(int, input().split())
    pr.append((x, y))
g = gcd(a, b+1)
num = a * b // g
ev = []
for p in pr:
    l = p[0]
    r = p[1]
    if r - l + 1 >= num:
        print(num)
        exit(0)
    l %= num
    r %= num
    if r < l:
        ev += [(l, 1), (num, -1), (0, 1), (r+1, -1)]
    else:
        ev += [(l, 1), (r + 1, -1)]
ev.sort()
bal = 0
last = 0
ans = 0
for p in ev:
    x = p[0]
    tp = p[1]
    if bal: ans += x - last
    last = x
    bal += tp
print ans

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30