oj.uz

답안 #651704

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
651704 2022-10-19T20:52:03 Z beaconmc Power Plant (JOI20_power) PyPy 3
0 / 100
 36 ms 18216 KB 
import sys
sys.setrecursionlimit(1000000000)


n = int(input())
if n==1:
    print(1)
    quit()
edges = [[] for i in range(n+1)]
par = [-1 for i in range(n+1)]
visited = [False for i in range(n+1)]
for i in range(n-1):
    a,b = map(int, input().split())
    edges[a].append(b)
    edges[b].append(a)
sus = input()

for i in range(1,n+1):
    if len(edges[i]) == 1:
        root = i

def dfs(a):
    for i in edges[a]:
        if not visited[i]:
            par[i] = a
            visited[i] = True
            dfs(i)
visited[root] = True
dfs(root)
dps = [-1 for i in range(n+1)]
used = [-1 for i in range(n+1)]

def dp(a):

    if dps[a] != -1:
        return dps[a]
    if sus[a-1]=="0":
        
        sums = 0
        for i in edges[a]:
            if i == par[a]: continue
            sums += dp(i)
        dps[a] = sums
        
        return sums

    dps[a] = 1
    maxi = 0
    for i in edges[a]:
        if i == par[a]: continue
        maxi += dp(i)

    if dps[a] <= maxi-1:
        used[a] = 1
    dps[a] = max(dps[a], maxi-1)
    return dps[a]

ans = dp(root)
if used[root]:
    ans += 2
print(ans)

Subtask #1
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 36 ms 18216 KB Output is correct
2 Incorrect 36 ms 18216 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 36 ms 18216 KB Output is correct
2 Incorrect 36 ms 18216 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 36 ms 18216 KB Output is correct
2 Incorrect 36 ms 18216 KB Output isn't correct
3 Halted 0 ms 0 KB -