oj.uz

Submission #108759

# Submission time Handle Problem Language Result Execution time Memory
108759 2019-05-01T15:22:21 Z MAMBA One-Way Streets (CEOI17_oneway) C++17
100 / 100
 187 ms 20552 KB 
#include <bits/stdc++.h>

using namespace std;

#define rep(i , j , k) for(int i = j; i < k; i++)
#define pb push_back

typedef long long ll;
typedef pair<int , int> pii;
typedef vector<int> vi;

template<typename S, typename T> 
inline bool smin(S &l, T r) { return l < r ? 0 : (l = r, 1); }
template<typename S, typename T> 
inline bool smax(S &l, T r) { return r < l ? 0 : (l = r, 1); }


constexpr int N = 1e5 + 10;

int n, m, p, a[N], b[N], COLOR, val[N];
vi adj[N], adj2[N];
int h[N], dp[N], inp[N], col[N];
bitset<N> mark;

void dfs2(int v, int cl, int id = -1) {
	mark[v] = true;
	if (col[v] != cl && col[v]) {
		adj2[cl].pb(inp[v]);	
		cl = col[v];
	}
	col[v] = cl;
	for (auto e : adj[v]) {
		int u = a[e] ^ b[e] ^ v;
		if (!mark[u])
			dfs2(u , cl , e);
	}
}

void dfs(int v, int id = m) {
	mark[v] = true;
	dp[v] = h[v];
	for (auto e : adj[v]) {
		if (e == id) continue;
		int u = a[e] ^ b[e] ^ v;
		if (mark[u])
			smin(dp[v] , h[u]);
		else {
			h[u] = h[v] + 1;
			dfs(u, e);
			smin(dp[v] , dp[u]);
		}
	}
	if (dp[v] == h[v]) {
		col[v] = ++COLOR;
		inp[v] = id;

	}
}

char res[N];
void dfs3(int v, int id = m) {
	for (auto e : adj2[v]) {
		int u = v ^ col[a[e]] ^ col[b[e]];
		dfs3(u, e);
		val[v] += val[u];
	}
	if (val[v] == 0) return;
	res[id] = (val[v] < 0) == (col[b[id]] == v) ? 'R' : 'L';
}

int main() {
	ios::sync_with_stdio(0);

	cin >> n >> m;

	rep(i , 0 , m) {
		cin >> a[i] >> b[i];
		adj[a[i]].pb(i);
		adj[b[i]].pb(i);
	}


	vector<pii> ziba;
	rep(i , 1 , n + 1) 
		if (!mark[i]) {
			dfs(i);
			ziba.pb({i , COLOR});
		}	
	mark.reset();

	for (auto e : ziba) 
		dfs2(e.first , e.second);

	cin >> p;
	rep(i , 0 , p) {
		int u , v;
		cin >> u >> v;
		u = col[u] , v = col[v];
		val[u]++;
		val[v]--;
	}

	memset(res , 'B', sizeof(res));
	for (auto e : ziba)
		dfs3(e.second);
	rep(i , 0 , m) 
		cout << res[i];
	cout << '\n';

	return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 8 ms 5248 KB Output is correct
4 Correct 7 ms 5248 KB Output is correct
5 Correct 8 ms 5376 KB Output is correct
6 Correct 8 ms 5248 KB Output is correct
7 Correct 9 ms 5248 KB Output is correct
8 Correct 7 ms 5248 KB Output is correct
9 Correct 6 ms 5248 KB Output is correct
10 Correct 8 ms 5248 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 8 ms 5248 KB Output is correct
4 Correct 7 ms 5248 KB Output is correct
5 Correct 8 ms 5376 KB Output is correct
6 Correct 8 ms 5248 KB Output is correct
7 Correct 9 ms 5248 KB Output is correct
8 Correct 7 ms 5248 KB Output is correct
9 Correct 6 ms 5248 KB Output is correct
10 Correct 8 ms 5248 KB Output is correct
11 Correct 81 ms 10208 KB Output is correct
12 Correct 110 ms 11296 KB Output is correct
13 Correct 108 ms 12496 KB Output is correct
14 Correct 126 ms 13684 KB Output is correct
15 Correct 141 ms 14108 KB Output is correct
16 Correct 153 ms 14072 KB Output is correct
17 Correct 151 ms 16120 KB Output is correct
18 Correct 187 ms 14044 KB Output is correct
19 Correct 132 ms 17400 KB Output is correct
20 Correct 116 ms 11140 KB Output is correct
21 Correct 69 ms 11000 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 8 ms 5248 KB Output is correct
4 Correct 7 ms 5248 KB Output is correct
5 Correct 8 ms 5376 KB Output is correct
6 Correct 8 ms 5248 KB Output is correct
7 Correct 9 ms 5248 KB Output is correct
8 Correct 7 ms 5248 KB Output is correct
9 Correct 6 ms 5248 KB Output is correct
10 Correct 8 ms 5248 KB Output is correct
11 Correct 81 ms 10208 KB Output is correct
12 Correct 110 ms 11296 KB Output is correct
13 Correct 108 ms 12496 KB Output is correct
14 Correct 126 ms 13684 KB Output is correct
15 Correct 141 ms 14108 KB Output is correct
16 Correct 153 ms 14072 KB Output is correct
17 Correct 151 ms 16120 KB Output is correct
18 Correct 187 ms 14044 KB Output is correct
19 Correct 132 ms 17400 KB Output is correct
20 Correct 116 ms 11140 KB Output is correct
21 Correct 69 ms 11000 KB Output is correct
22 Correct 170 ms 17264 KB Output is correct
23 Correct 175 ms 15608 KB Output is correct
24 Correct 176 ms 15096 KB Output is correct
25 Correct 139 ms 20552 KB Output is correct
26 Correct 149 ms 16860 KB Output is correct
27 Correct 139 ms 15608 KB Output is correct
28 Correct 45 ms 8312 KB Output is correct
29 Correct 110 ms 11764 KB Output is correct
30 Correct 104 ms 12044 KB Output is correct
31 Correct 120 ms 12280 KB Output is correct
32 Correct 114 ms 15520 KB Output is correct