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Submission #476355

# Submission time Handle Problem Language Result Execution time Memory
476355 2021-09-26T07:22:38 Z cgiosy One-Way Streets (CEOI17_oneway) C++17
100 / 100
 64 ms 11588 KB 
#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	int N, M, Q;
	cin>>N>>M;
	int E[M*2+2], F[M*2+2], G[N]{};
	for(int i=1; i<=M; i++) {
		int a, b;
		cin>>a>>b; --a, --b;
		E[i*2]=b, F[i*2]=G[a], G[a]=i*2;
		E[i*2+1]=a, F[i*2+1]=G[b], G[b]=i*2+1;
	}

	int A[N]{}, T[N], P[N], t=0;
	char V[max(N, M)+1]{};
	function<int(int)> root=[&](int i) {
		return P[i]>=0 ? P[i]=root(P[i]) : i;
	};
	auto up=[&](int&i) { i=P[i]=root(~P[i]); };
	function<void(int, int)> bcc=[&](int i, int p) {
		A[i]=T[i]=++t;
		for(int e=G[i]; e; e=F[e]) if(e!=p) {
			int&j=E[e];
			if(A[j]) { T[i]=min(T[i], A[j]); continue; }
			V[e>>1]=e&1, P[j]=~i;
			bcc(j, e^1);
			T[i]=min(T[i], T[j]);
			if(A[i]<T[j]) V[e>>1]|=2;
		}
	};
	for(int i=0; i<N; i++) if(!A[i]) P[i]=~i, bcc(i, 0);

	cin>>Q;
	while(Q--) {
		int i, j, a=4, b=8;
		cin>>i>>j; --i, --j;
		if(A[i]<A[j]) swap(i, j), swap(a, b);
		for(i=root(i); A[i]>A[j]; up(i)) V[i]|=a;
		for(j=root(j); A[j]>A[i]; up(j)) V[j]|=b;
	}

	for(int i=1; i<=M; i++) {
		int v=V[i], u=v&1, t=V[E[i*2^u]]>>2;
		cout<<((v&2) && t ? (t^u)&1 ? 'L' : 'R' : 'B');
	}
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 38 ms 4748 KB Output is correct
12 Correct 32 ms 5684 KB Output is correct
13 Correct 36 ms 6660 KB Output is correct
14 Correct 35 ms 7288 KB Output is correct
15 Correct 36 ms 7324 KB Output is correct
16 Correct 30 ms 4684 KB Output is correct
17 Correct 34 ms 6724 KB Output is correct
18 Correct 34 ms 4776 KB Output is correct
19 Correct 34 ms 8196 KB Output is correct
20 Correct 34 ms 6344 KB Output is correct
21 Correct 26 ms 5580 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 38 ms 4748 KB Output is correct
12 Correct 32 ms 5684 KB Output is correct
13 Correct 36 ms 6660 KB Output is correct
14 Correct 35 ms 7288 KB Output is correct
15 Correct 36 ms 7324 KB Output is correct
16 Correct 30 ms 4684 KB Output is correct
17 Correct 34 ms 6724 KB Output is correct
18 Correct 34 ms 4776 KB Output is correct
19 Correct 34 ms 8196 KB Output is correct
20 Correct 34 ms 6344 KB Output is correct
21 Correct 26 ms 5580 KB Output is correct
22 Correct 55 ms 7860 KB Output is correct
23 Correct 54 ms 5916 KB Output is correct
24 Correct 57 ms 5988 KB Output is correct
25 Correct 60 ms 11588 KB Output is correct
26 Correct 62 ms 7364 KB Output is correct
27 Correct 64 ms 6072 KB Output is correct
28 Correct 34 ms 3112 KB Output is correct
29 Correct 53 ms 7224 KB Output is correct
30 Correct 55 ms 6772 KB Output is correct
31 Correct 54 ms 8436 KB Output is correct
32 Correct 51 ms 8864 KB Output is correct