Submission #636869

#	Time	Username	Problem	Language	Result	Execution time	Memory
636869		beaconmc	Strange Device (APIO19_strange_device)	Pypy 3	100 / 100	1619 ms	353536 KiB

strange_device

import sys
input = lambda: sys.stdin.readline().strip()
from math import *
n,a,b = map(int, input().split())

def lcm(a,b):
  return a*b//gcd(a,b)

ranges = []
for i in range(n):
    ranges.append(list(map(int, input().split())))

k = (lcm(a,b+1)//(b+1)) * b

new = []
ans = 0
flag = False
for i in ranges:
    if i[1]-i[0]+1 >= k:
        flag = True
    if i[0]%k > i[1]%k:
        new.append([i[0]%k,k-1])
        new.append([0,i[1]%k])
    else:
        new.append([i[0]%k, i[1]%k])
new.sort()

realnew = []
if flag:
    print(k)
else:
    cur = k
    for i in range(len(new)):
        if not realnew:
            realnew.append(new[i])
            continue
        if realnew[-1][1] >= new[i][0]:
            realnew[-1][1] = max(realnew[-1][1],new[i][1])
        else:
            realnew.append(new[i])
    for i in realnew:
        ans += i[1]-i[0]+1
    print(ans)

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