Submission #10369544

Source Code Expand

n,m=map(int,input().split())
arr=[list(map(int,input().split())) for _ in range(m)]
count=[1]*(n+1)
s=set()
s.add(1)
for a,b in arr:
  count[b]+=1
  count[a]-=1
  if a in s:
    s.add(b)
  if count[a]==0:
    s.discard(a)
print(len(s))

Submission Info

Submission Time
Task B - Box and Ball
User tanon710
Language Python (3.4.3)
Score 400
Code Size 247 Byte
Status AC
Exec Time 375 ms
Memory 34332 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 3060 KB
1_00.txt AC 16 ms 3064 KB
1_01.txt AC 17 ms 2940 KB
1_02.txt AC 17 ms 3064 KB
1_03.txt AC 16 ms 3064 KB
1_04.txt AC 368 ms 24936 KB
1_05.txt AC 357 ms 34332 KB
1_06.txt AC 343 ms 27140 KB
1_07.txt AC 361 ms 30372 KB
1_08.txt AC 234 ms 19776 KB
1_09.txt AC 240 ms 20684 KB
1_10.txt AC 78 ms 8532 KB
1_11.txt AC 140 ms 12964 KB
1_12.txt AC 27 ms 4332 KB
1_13.txt AC 309 ms 24932 KB
1_14.txt AC 173 ms 14624 KB
1_15.txt AC 293 ms 23008 KB
1_16.txt AC 21 ms 3700 KB
1_17.txt AC 372 ms 28684 KB
1_18.txt AC 328 ms 26392 KB
1_19.txt AC 371 ms 28580 KB
1_20.txt AC 358 ms 26552 KB
1_21.txt AC 280 ms 23480 KB
1_22.txt AC 375 ms 28924 KB
1_23.txt AC 104 ms 10188 KB