結果

問題 No.1602 With Animals into Institute 2
ユーザー shotoyoo
提出日時 2021-06-19 16:19:34
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 3,027 ms / 4,000 ms
コード長 3,493 bytes
コンパイル時間 172 ms
コンパイル使用メモリ 82,176 KB
実行使用メモリ 230,400 KB
最終ジャッジ日時 2024-07-02 02:06:10
合計ジャッジ時間 37,189 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 36
権限があれば一括ダウンロードができます

ソースコード

diff # 

import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


class UF:
    # unionfind
    def __init__(self, n):
        self.n = n
        self.parent = list(range(n))
        self.size = [1] * n
    def check(self):
        return [self.root(i) for i in range(self.n)]
    def root(self, i):
        inter = set()
        while self.parent[i]!=i:
            inter.add(i)
            i = self.parent[i]
        r = i
        for i in inter:
            self.parent[i] = r
        return r
    def connect(self, i, j):
        # 繋いだかどうかを返す
        ri = self.root(i)
        rj = self.root(j)
        if ri==rj:
            return False
        if depth[rj]<depth[ri]:
            self.parent[ri] = rj
            self.size[rj] += self.size[ri]
        else:
            self.parent[rj] = ri
            self.size[ri] += self.size[rj]
        return True

    
# グラフの読み込み・重みあり
inf = 10**16
n,m,k = map(int, input().split())
ns = [[] for _ in range(n)]
ans = [-1]*n
h = []
q = [inf]*n
parent = list(range(n))
uf = UF(n)
d = [-1]*n
l = [-1]*n
es = []
for e in range(m):
    u,v,c,x = input().split()
    u = int(u)
    v = int(v)
    c = int(c)
    x = int(x, 2)
    u -= 1
    v -= 1
    ns[u].append((c,x,e,v))
    ns[v].append((c,x,e,u))
    es.append((u,v,c,x))
### ダイクストラ dijkstra
_val = 1<<20
def to(d,u):
    return d*_val+u
def frm(val):
    return divmod(val,_val)
def dijkstra(start,ns):
    import heapq
    vals = [inf] * n
    h = [to(0, start)] # (距離, ノード番号)
    vals[start] = 0
    ps = [-1]*n
    ps[start] = (-1,-1,start)
    # order = []
    while h:
        val, u = frm(heapq.heappop(h))
        if val>vals[u]:
            continue
        # order.append(u)
        for d,x,e,v in ns[u]:
            if vals[v]>val+d:
                vals[v] = val+d
                heapq.heappush(h, to(vals[v], v))
                ps[v] = (d,x,u)
    return vals, ps

vals, ps = dijkstra(n-1, ns)
ns2 = [[] for _ in range(n)]
for i,(dd,x,v) in enumerate(ps[:-1]):
    ns2[i].append((dd,x,v))
    ns2[v].append((dd,x,i))
qq = [n-1]
d[n-1] = 0
l[n-1] = 0
depth = [0]*n
while qq:
    u = qq.pop()
    for dd,x,v in ns2[u]:
        if d[v]>=0:
            continue
        d[v] = d[u] + dd
        l[v] = l[u] ^ x
        depth[v] = depth[u] + 1
        qq.append(v)
from heapq import heappop as hpp, heappush as hp, heapify
hbest = [inf]*m
for e,(u,v,c,x) in enumerate(es):
    if l[u]^x!=l[v]:
        h.append((d[u]+d[v]+c, e))
heapify(h)
while h:
    val, e = hpp(h)
    if val>=inf:
        break
    if val>hbest[e]:
        continue
    hbest[e] = val
    u,v,c,x = es[e]
    w1 = uf.root(u)
    w2 = uf.root(v)
    b = []
    while w1!=w2:
        if depth[w1]<=depth[w2]:
            b.append(w2)
            w2 = uf.root(ps[w2][2])
        else:
            b.append(w1)
            w1 = uf.root(ps[w1][2])
#     print(w1,w2)
    for ww in b:
        uf.connect(w1,ww)
        # q[ww] = min(q[ww], val - d[w1])
        q[ww] = val - d[ww]
        for cc,xx,ee,vv in ns[ww]:
            val2 = q[ww] + d[vv] + cc
            if val2<hbest[ee]:
                hp(h, (val2, ee))
for v in range(n-1):
    if l[v]!=0:
        ans[v] = d[v]
    else:
        ans[v] = q[v]
    if ans[v]==inf:
        ans[v] = -1
write("\n".join(map(str, ans[:-1])))
0