Submission #10369584

Source Code Expand

n,m=map(int,input().split())
arr=[list(map(int,input().split())) for _ in range(m)]
count=[1]*(n+1)
flag=[False]*(n+1)
flag[1]=True
for a,b in arr:
  count[b]+=1
  count[a]-=1
  if flag[a]==True:
    flag[b]=True
  if count[a]==0:
    flag[a]=False
print(flag.count(True))

Submission Info

Submission Time
Task B - Box and Ball
User tanon710
Language Python (3.4.3)
Score 400
Code Size 284 Byte
Status AC
Exec Time 367 ms
Memory 30884 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 27
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt
Case Name Status Exec Time Memory
0_00.txt AC 17 ms 3064 KB
0_01.txt AC 17 ms 3064 KB
0_02.txt AC 17 ms 3064 KB
1_00.txt AC 17 ms 3064 KB
1_01.txt AC 17 ms 3064 KB
1_02.txt AC 17 ms 3064 KB
1_03.txt AC 17 ms 3064 KB
1_04.txt AC 349 ms 25704 KB
1_05.txt AC 365 ms 30884 KB
1_06.txt AC 346 ms 24968 KB
1_07.txt AC 367 ms 28072 KB
1_08.txt AC 231 ms 18552 KB
1_09.txt AC 234 ms 19572 KB
1_10.txt AC 81 ms 8396 KB
1_11.txt AC 144 ms 12316 KB
1_12.txt AC 29 ms 4972 KB
1_13.txt AC 303 ms 23900 KB
1_14.txt AC 166 ms 13988 KB
1_15.txt AC 285 ms 22364 KB
1_16.txt AC 23 ms 4212 KB
1_17.txt AC 354 ms 27832 KB
1_18.txt AC 331 ms 25136 KB
1_19.txt AC 365 ms 27188 KB
1_20.txt AC 333 ms 25792 KB
1_21.txt AC 282 ms 22112 KB
1_22.txt AC 360 ms 27812 KB
1_23.txt AC 101 ms 10056 KB