結果
問題 | No.1813 Magical Stones |
ユーザー | aaaaaaaaaa2230 |
提出日時 | 2022-01-20 23:10:37 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 3,579 bytes |
コンパイル時間 | 2,645 ms |
コンパイル使用メモリ | 86,892 KB |
実行使用メモリ | 123,956 KB |
最終ジャッジ日時 | 2023-08-15 23:47:27 |
合計ジャッジ時間 | 16,784 ms |
ジャッジサーバーID (参考情報) |
judge15 / judge12 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 69 ms
71,368 KB |
testcase_01 | AC | 68 ms
71,120 KB |
testcase_02 | AC | 69 ms
71,264 KB |
testcase_03 | AC | 111 ms
86,124 KB |
testcase_04 | AC | 70 ms
71,524 KB |
testcase_05 | WA | - |
testcase_06 | AC | 135 ms
79,016 KB |
testcase_07 | AC | 75 ms
71,384 KB |
testcase_08 | AC | 88 ms
76,680 KB |
testcase_09 | AC | 97 ms
77,284 KB |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | AC | 73 ms
71,320 KB |
testcase_13 | AC | 69 ms
71,440 KB |
testcase_14 | AC | 105 ms
86,432 KB |
testcase_15 | WA | - |
testcase_16 | AC | 496 ms
108,640 KB |
testcase_17 | AC | 443 ms
123,956 KB |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | AC | 437 ms
108,852 KB |
testcase_21 | AC | 457 ms
109,276 KB |
testcase_22 | AC | 444 ms
109,328 KB |
testcase_23 | AC | 418 ms
108,536 KB |
testcase_24 | WA | - |
testcase_25 | AC | 204 ms
81,904 KB |
testcase_26 | AC | 159 ms
79,456 KB |
testcase_27 | WA | - |
testcase_28 | WA | - |
testcase_29 | WA | - |
testcase_30 | WA | - |
testcase_31 | AC | 442 ms
113,036 KB |
testcase_32 | AC | 69 ms
71,264 KB |
testcase_33 | AC | 71 ms
71,140 KB |
testcase_34 | AC | 163 ms
79,908 KB |
testcase_35 | AC | 152 ms
82,404 KB |
testcase_36 | AC | 133 ms
78,764 KB |
testcase_37 | AC | 213 ms
87,796 KB |
testcase_38 | AC | 150 ms
83,880 KB |
testcase_39 | AC | 358 ms
99,156 KB |
testcase_40 | WA | - |
testcase_41 | AC | 108 ms
77,880 KB |
testcase_42 | AC | 148 ms
82,588 KB |
testcase_43 | AC | 192 ms
80,684 KB |
ソースコード
import sys input = sys.stdin.readline class SCC: def __init__(self,n): self.n = n self.edges = [] def csr(self): self.start = [0]*(self.n+1) self.elist = [0]*len(self.edges) for e in self.edges: self.start[e[0]+1] += 1 for i in range(1,self.n+1): self.start[i] += self.start[i-1] counter = self.start[:] for e in self.edges: self.elist[counter[e[0]]] = e[1] counter[e[0]] += 1 def add_edge(self,u,v): self.edges.append((u,v)) def scc_ids(self): self.csr() n = self.n now_ord = group_num = 0 visited = [] low = [0]*n order = [-1]*n ids = [0]*n parent = [-1]*n stack = [] for i in range(n): if order[i] == -1: stack.append(i) stack.append(i) while stack: v = stack.pop() if order[v] == -1: low[v] = order[v] = now_ord now_ord += 1 visited.append(v) for i in range(self.start[v],self.start[v+1]): to = self.elist[i] if order[to] == -1: stack.append(to) stack.append(to) parent[to] = v else: low[v] = min(low[v],order[to]) else: if low[v] == order[v]: while True: u = visited.pop() order[u] = n ids[u] = group_num if u == v: break group_num += 1 if parent[v] != -1: low[parent[v]] = min(low[parent[v]],low[v]) for i,x in enumerate(ids): ids[i] = group_num-1-x return group_num,ids def scc(self): group_num,ids = self.scc_ids() groups = [[] for i in range(group_num)] for i,x in enumerate(ids): groups[x].append(i) return groups class Unionfind: def __init__(self,n): self.uf = [-1]*n def find(self,x): if self.uf[x] < 0: return x else: self.uf[x] = self.find(self.uf[x]) return self.uf[x] def same(self,x,y): return self.find(x) == self.find(y) def union(self,x,y): x = self.find(x) y = self.find(y) if x == y: return False if self.uf[x] > self.uf[y]: x,y = y,x self.uf[x] += self.uf[y] self.uf[y] = x return True def size(self,x): x = self.find(x) return -self.uf[x] n,m = map(int,input().split()) scc = SCC(n) uf = Unionfind(n) for i in range(m): a,b = [int(x)-1 for x in input().split()] scc.add_edge(a,b) uf.union(a,b) group = scc.scc() groups = [0]*n used = [0]*n for i,g in enumerate(group): for j in g: groups[j] = i if used[uf.find(j)]: continue used[uf.find(j)] = 1 ans = 0 used2 = [0]*len(group) for a,b in scc.edges: if groups[a] != groups[b]: used2[groups[a]] = 1 for u in used2: if u: continue ans += 1 if len(used2) == 1: ans = 0 print(ans)