Submission #73368476

Source Code Expand

n,m = map(int, input().split())
lis = [list(map(int, input().split())) for _ in range(m)]
lis.sort()
ind = 0
l = 0
r = 0
ans = 0
while l < n and ind < m:
  tf = False
  while ind < m and lis[ind][0] <= l+1:
    if lis[ind][1] > r:
      r = lis[ind][1]
      tf = True
    ind += 1

  if tf==False:
    print(-1)
    exit()
  ans += 1
  l = r

  
  
if l == n:
  print(ans)
else:
  print(-1)

Submission Info

Submission Time
Task D - Placement of Security Guards
User sigtuna
Language Python (PyPy 3.11-v7.3.20)
Score 400
Code Size 417 Byte
Status AC
Exec Time 522 ms
Memory 131248 KiB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 64
Set Name Test Cases
Sample sample01.txt, sample02.txt, sample03.txt
All sample01.txt, sample02.txt, sample03.txt, in01.txt, in02.txt, in03.txt, in04.txt, in05.txt, in06.txt, in07.txt, in08.txt, in09.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in46.txt, in47.txt, in48.txt, in49.txt, in50.txt, in51.txt, in52.txt, in53.txt, in54.txt, in55.txt, in56.txt, in57.txt, in58.txt, in59.txt, in60.txt, in61.txt
Case Name Status Exec Time Memory
in01.txt AC 49 ms 79736 KiB
in02.txt AC 47 ms 79732 KiB
in03.txt AC 47 ms 79716 KiB
in04.txt AC 47 ms 79732 KiB
in05.txt AC 49 ms 80904 KiB
in06.txt AC 48 ms 79656 KiB
in07.txt AC 47 ms 79696 KiB
in08.txt AC 64 ms 91616 KiB
in09.txt AC 517 ms 130548 KiB
in10.txt AC 398 ms 131120 KiB
in11.txt AC 257 ms 128700 KiB
in12.txt AC 510 ms 130824 KiB
in13.txt AC 254 ms 129256 KiB
in14.txt AC 246 ms 129172 KiB
in15.txt AC 255 ms 128908 KiB
in16.txt AC 255 ms 129088 KiB
in17.txt AC 254 ms 129004 KiB
in18.txt AC 252 ms 128572 KiB
in19.txt AC 49 ms 79736 KiB
in20.txt AC 510 ms 131248 KiB
in21.txt AC 518 ms 131244 KiB
in22.txt AC 50 ms 79644 KiB
in23.txt AC 48 ms 79740 KiB
in24.txt AC 47 ms 79644 KiB
in25.txt AC 47 ms 79740 KiB
in26.txt AC 46 ms 79696 KiB
in27.txt AC 254 ms 128692 KiB
in28.txt AC 50 ms 79872 KiB
in29.txt AC 49 ms 79736 KiB
in30.txt AC 48 ms 79644 KiB
in31.txt AC 48 ms 79712 KiB
in32.txt AC 47 ms 79756 KiB
in33.txt AC 47 ms 79868 KiB
in34.txt AC 47 ms 79716 KiB
in35.txt AC 46 ms 79700 KiB
in36.txt AC 47 ms 79976 KiB
in37.txt AC 47 ms 79976 KiB
in38.txt AC 518 ms 131168 KiB
in39.txt AC 522 ms 131096 KiB
in40.txt AC 292 ms 128684 KiB
in41.txt AC 50 ms 80364 KiB
in42.txt AC 49 ms 80648 KiB
in43.txt AC 515 ms 131100 KiB
in44.txt AC 511 ms 130992 KiB
in45.txt AC 50 ms 79880 KiB
in46.txt AC 49 ms 79424 KiB
in47.txt AC 48 ms 79740 KiB
in48.txt AC 47 ms 79880 KiB
in49.txt AC 46 ms 79608 KiB
in50.txt AC 47 ms 79880 KiB
in51.txt AC 46 ms 79832 KiB
in52.txt AC 46 ms 79936 KiB
in53.txt AC 251 ms 129092 KiB
in54.txt AC 255 ms 128904 KiB
in55.txt AC 50 ms 79880 KiB
in56.txt AC 48 ms 79976 KiB
in57.txt AC 47 ms 79716 KiB
in58.txt AC 47 ms 79640 KiB
in59.txt AC 47 ms 79656 KiB
in60.txt AC 48 ms 79716 KiB
in61.txt AC 48 ms 79976 KiB
sample01.txt AC 47 ms 79700 KiB
sample02.txt AC 47 ms 79736 KiB
sample03.txt AC 47 ms 79880 KiB