oj.uz

Submission #859666

# Submission time Handle Problem Language Result Execution time Memory
859666 2023-10-10T12:31:30 Z samek08 One-Way Streets (CEOI17_oneway) C++14
100 / 100
 56 ms 16988 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(a,b) for (int a = 0; a < (b); ++a)
#define pb push_back
#define all(t) t.begin(), t.end()

struct Krawedz
{
	int a,b;
};

const int MAXN = 1e5+5, MAXM = 1e5+5;
int n = 0, m = 0, p = 0, a = 0, b = 0, korzen = 0, cnt = -1;
vector<int> krawedzie[MAXN];
Krawedz krawedz_in[MAXM];
int wyn[MAXM];
int ile_parent[MAXN];
int glebokosc[MAXN];
int low[MAXN];
int parent[MAXN];
bool czy_most[MAXN];
int w_jakiej_spojnej[MAXN];
int dp[MAXN];
bool visited[MAXN];
int res[MAXN];

inline void DFS(int v, int par)
{
	low[v] = glebokosc[v];
	parent[v] = par;
	for(auto x : krawedzie[v])
	{
		if(x == par) ++ile_parent[v];
		else if(glebokosc[x] == -1)
		{
			glebokosc[x] = glebokosc[v] + 1;
			DFS(x,v);
			low[v] = min(low[v],low[x]);
		}
		else low[v] = min(low[v],glebokosc[x]);
	}
	if(ile_parent[v] > 1) low[v] = min(low[v],glebokosc[v]-1);
	if(v != korzen and low[v] == glebokosc[v]) czy_most[v] = true;
}

inline void DFS2(int v)
{
	w_jakiej_spojnej[v] = cnt;
	for(auto x : krawedzie[v]) if(w_jakiej_spojnej[x] == -1) DFS2(x);
}

inline void DFS3(int v, int par)
{
	parent[v] = par;
	visited[v] = true;
	for(auto x : krawedzie[v])
	{
		if(visited[x] == false)
		{
			DFS3(x,v);
			dp[v] += dp[x];
		}
	}
	if(par != -1) res[v] = dp[v];
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin >> n >> m;
	rep(i,m)
	{
		cin >> a >> b;
		krawedz_in[i] = {a,b};
		krawedzie[a].pb(b), krawedzie[b].pb(a);
	}

	for(int i = 1; i <= n; ++i) glebokosc[i] = -1;
	for(int i = 1; i <= n; ++i)
	{
		if(glebokosc[i] == -1)
		{
			glebokosc[i] = 0, korzen = i;
			DFS(i,0);
		}
	}

	for(int i = 1; i <= n; ++i) krawedzie[i] = vector<int>();
	rep(i,m)
	{
		int a = krawedz_in[i].a, b = krawedz_in[i].b;
		if((czy_most[a] == true and parent[a] == b) or (czy_most[b] == true and parent[b] == a)) continue;
		krawedzie[a].pb(b), krawedzie[b].pb(a);
	}


	for(int i = 1; i <= n; ++i) w_jakiej_spojnej[i] = -1;
	for(int i = 1; i <= n; ++i)
	{
		if(w_jakiej_spojnej[i] == -1)
		{
			++cnt;
			DFS2(i);
		}
	}

	for(int i = 1; i <= n; ++i) krawedzie[i] = vector<int>();
	rep(i,m)
	{
		int a = w_jakiej_spojnej[krawedz_in[i].a], b = w_jakiej_spojnej[krawedz_in[i].b];
		if(a == b) wyn[i] = 2;
		else
		{
			krawedzie[a].pb(b), krawedzie[b].pb(a);
		}
	}

	cin >> p;
	rep(i,p)
	{
		cin >> a >> b;
		a = w_jakiej_spojnej[a], b = w_jakiej_spojnej[b];
		++dp[a], --dp[b];
	}

	for(int i = 1; i <= n; ++i) if(visited[i] == false) DFS3(i,-1);

	rep(i,m)
	{
		int a = w_jakiej_spojnej[krawedz_in[i].a], b = w_jakiej_spojnej[krawedz_in[i].b];
		if(a != b)
		{
			if(parent[a] == b)
			{
				if(res[a] == 0) wyn[i] = 2;
				else if(res[a] > 0) wyn[i] = 0;
				else wyn[i] = 1;
			}
			if(parent[b] == a)
			{
				if(res[b] == 0) wyn[i] = 2;
				else if(res[b] > 0) wyn[i] = 1;
				else wyn[i] = 0;
			}
		}
	}

	rep(i,m)
	{
		if(wyn[i] == 0) cout << 'R';
		else if (wyn[i] == 1) cout << 'L';
		else cout << 'B';
	}
	cout << '\n';

	return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6644 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 1 ms 6748 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6644 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 1 ms 6748 KB Output is correct
11 Correct 29 ms 10772 KB Output is correct
12 Correct 35 ms 11436 KB Output is correct
13 Correct 38 ms 12504 KB Output is correct
14 Correct 41 ms 13140 KB Output is correct
15 Correct 43 ms 12880 KB Output is correct
16 Correct 38 ms 11344 KB Output is correct
17 Correct 39 ms 13004 KB Output is correct
18 Correct 38 ms 11344 KB Output is correct
19 Correct 42 ms 14124 KB Output is correct
20 Correct 32 ms 11096 KB Output is correct
21 Correct 31 ms 10824 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6644 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 1 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6748 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 1 ms 6748 KB Output is correct
11 Correct 29 ms 10772 KB Output is correct
12 Correct 35 ms 11436 KB Output is correct
13 Correct 38 ms 12504 KB Output is correct
14 Correct 41 ms 13140 KB Output is correct
15 Correct 43 ms 12880 KB Output is correct
16 Correct 38 ms 11344 KB Output is correct
17 Correct 39 ms 13004 KB Output is correct
18 Correct 38 ms 11344 KB Output is correct
19 Correct 42 ms 14124 KB Output is correct
20 Correct 32 ms 11096 KB Output is correct
21 Correct 31 ms 10824 KB Output is correct
22 Correct 52 ms 13904 KB Output is correct
23 Correct 50 ms 12376 KB Output is correct
24 Correct 56 ms 12608 KB Output is correct
25 Correct 53 ms 16988 KB Output is correct
26 Correct 53 ms 13708 KB Output is correct
27 Correct 50 ms 12752 KB Output is correct
28 Correct 23 ms 8620 KB Output is correct
29 Correct 44 ms 11860 KB Output is correct
30 Correct 43 ms 11856 KB Output is correct
31 Correct 44 ms 12112 KB Output is correct
32 Correct 51 ms 14272 KB Output is correct