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Submission #476358

# Submission time Handle Problem Language Result Execution time Memory
476358 2021-09-26T07:39:21 Z cgiosy One-Way Streets (CEOI17_oneway) C++17
100 / 100
 53 ms 9236 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]{}, D[N]{}, T[N], t=0;
	char S[M+1];
	cin>>Q;
	while(Q--) {
		int i, j;
		cin>>i>>j; --i, --j;
		++D[i], --D[j];
	}
	fill(S, S+M, 'B');
	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; }
			bcc(j, e^1);
			T[i]=min(T[i], T[j]);
			D[i]+=D[j];
			if(A[i]<T[j] && D[j]) S[e-2>>1]=(e&1 ? -D[j] : D[j])>0 ? 'L' : 'R';
		}
	};
	for(int i=0; i<N; i++) if(!A[i]) bcc(i, 0);

	S[M]=0;
	cout<<S<<'\n';
}

Compilation message

oneway.cpp: In lambda function:
oneway.cpp:33:29: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   33 |    if(A[i]<T[j] && D[j]) S[e-2>>1]=(e&1 ? -D[j] : D[j])>0 ? 'L' : 'R';
      |                            ~^~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 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 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 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 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 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 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 25 ms 3724 KB Output is correct
12 Correct 24 ms 4620 KB Output is correct
13 Correct 26 ms 5544 KB Output is correct
14 Correct 28 ms 6028 KB Output is correct
15 Correct 31 ms 6188 KB Output is correct
16 Correct 26 ms 3532 KB Output is correct
17 Correct 25 ms 5588 KB Output is correct
18 Correct 25 ms 3540 KB Output is correct
19 Correct 24 ms 6996 KB Output is correct
20 Correct 25 ms 5256 KB Output is correct
21 Correct 26 ms 4480 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 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 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 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 25 ms 3724 KB Output is correct
12 Correct 24 ms 4620 KB Output is correct
13 Correct 26 ms 5544 KB Output is correct
14 Correct 28 ms 6028 KB Output is correct
15 Correct 31 ms 6188 KB Output is correct
16 Correct 26 ms 3532 KB Output is correct
17 Correct 25 ms 5588 KB Output is correct
18 Correct 25 ms 3540 KB Output is correct
19 Correct 24 ms 6996 KB Output is correct
20 Correct 25 ms 5256 KB Output is correct
21 Correct 26 ms 4480 KB Output is correct
22 Correct 53 ms 5560 KB Output is correct
23 Correct 48 ms 3676 KB Output is correct
24 Correct 41 ms 3524 KB Output is correct
25 Correct 51 ms 9236 KB Output is correct
26 Correct 40 ms 5056 KB Output is correct
27 Correct 44 ms 3796 KB Output is correct
28 Correct 31 ms 1964 KB Output is correct
29 Correct 41 ms 4992 KB Output is correct
30 Correct 40 ms 4404 KB Output is correct
31 Correct 43 ms 6212 KB Output is correct
32 Correct 44 ms 6652 KB Output is correct