oj.uz

Submission #1071318

# Submission time Handle Problem Language Result Execution time Memory
1071318 2024-08-23T06:40:47 Z shidou26 One-Way Streets (CEOI17_oneway) C++14
100 / 100
 50 ms 22616 KB 
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())

typedef long long ll;
typedef pair<int, int> ii;

const int MOD = 1e9 + 7;
inline ll add(ll x, ll y, ll mod = MOD) {return ((x % mod) + (y % mod)) % mod;}
inline ll sub(ll x, ll y, ll mod = MOD) {return ((x - y) % mod + mod) % mod;}
inline ll prod(ll x, ll y, ll mod = MOD) {return ((x % mod) * (y % mod)) % mod;}

const int N = 1e5 + 3;

int n, m, q;
int eu[N], ev[N];
vector<int> adj[N];

int timer = 0, comps = 0;
int low[N], num[N], ids[N], ans[N], dp[N];
bool used[N], vst[N];
ii t[N];
vector<int> tree[N];
stack<int> st;

void prepare() {

}

void input() {
	cin >> n >> m;

	for(int i = 1; i <= m; i++) {
		int u, v; cin >> u >> v;
		eu[i] = u;
		ev[i] = v;
		adj[u].push_back(i);
		adj[v].push_back(i);
	}
}

void dfs_tarjan(int u, int pre_id) {
	low[u] = num[u] = ++timer; st.push(u);

	for(int i = 0; i < (int)adj[u].size(); i++) {
		int id = adj[u][i];

		if(id != pre_id) {
			int v = eu[id] + ev[id] - u;

			if(used[v]) continue;

			if(num[v]) low[u] = min(low[u], num[v]);
			else {
				dfs_tarjan(v, id);
				low[u] = min(low[u], low[v]);
			}
		}
	}

	if(low[u] == num[u]) {
		++comps;
		
		int v;
		do {
			v = st.top(); st.pop();
			ids[v] = comps;
			used[v] = true;
		}while(v != u);
	}
}

void dfs_solve(int u, int pre_id) {
	vst[u] = true;

	for(int i = 0; i < (int)tree[u].size(); i++) {
		int id = tree[u][i];

		if(id != pre_id) {
			int v = t[id].first + t[id].second - u;
			dfs_solve(v, id);
			dp[u] += dp[v];

			if(dp[v] == 0) ans[id] = 0;
			else if(dp[v] < 0) ans[id] = (v == t[id].second ? 2 : 1);
			else ans[id] = (v == t[id].second ? 1 : 2);
		}
	}
}

void process() {
	for(int i = 1; i <= n; i++) {
		if(!num[i]) dfs_tarjan(i, -1);
	}

	for(int i = 1; i <= m; i++) {
		int u = eu[i], v = ev[i];
		int a = ids[u], b = ids[v];

		if(a == b) ans[i] = 0;
		else {
			t[i] = ii(a, b);
			tree[a].push_back(i);
			tree[b].push_back(i);
		}
	}

	cin >> q;
	while(q--) {
		int x, y; cin >> x >> y;
		dp[ids[x]]++;
		dp[ids[y]]--;
	}

	for(int i = 1; i <= comps; i++) {
		if(!vst[i]) dfs_solve(i, -1);
	}

	for(int i = 1; i <= m; i++) {
		if(ans[i] == 0) cout << 'B';
		else if(ans[i] == 1) cout << 'L';
		else cout << 'R';
	}
}

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

    #define task "Date_A_Live"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    prepare();
    
    int tc = 1; // cin >> tc;
    
    for(int i = 1; i <= tc; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deito hajimemashou" << endl;

    return 0;
}

/*
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*/

Compilation message

oneway.cpp: In function 'int main()':
oneway.cpp:135:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
oneway.cpp:136:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8792 KB Output is correct
2 Correct 1 ms 8796 KB Output is correct
3 Correct 1 ms 8796 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 2 ms 8880 KB Output is correct
9 Correct 2 ms 8796 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8792 KB Output is correct
2 Correct 1 ms 8796 KB Output is correct
3 Correct 1 ms 8796 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 2 ms 8880 KB Output is correct
9 Correct 2 ms 8796 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct
11 Correct 23 ms 12624 KB Output is correct
12 Correct 25 ms 13660 KB Output is correct
13 Correct 31 ms 14672 KB Output is correct
14 Correct 31 ms 15452 KB Output is correct
15 Correct 32 ms 15832 KB Output is correct
16 Correct 37 ms 16464 KB Output is correct
17 Correct 33 ms 18000 KB Output is correct
18 Correct 38 ms 16720 KB Output is correct
19 Correct 34 ms 19548 KB Output is correct
20 Correct 24 ms 13400 KB Output is correct
21 Correct 23 ms 12968 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8792 KB Output is correct
2 Correct 1 ms 8796 KB Output is correct
3 Correct 1 ms 8796 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 2 ms 8880 KB Output is correct
9 Correct 2 ms 8796 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct
11 Correct 23 ms 12624 KB Output is correct
12 Correct 25 ms 13660 KB Output is correct
13 Correct 31 ms 14672 KB Output is correct
14 Correct 31 ms 15452 KB Output is correct
15 Correct 32 ms 15832 KB Output is correct
16 Correct 37 ms 16464 KB Output is correct
17 Correct 33 ms 18000 KB Output is correct
18 Correct 38 ms 16720 KB Output is correct
19 Correct 34 ms 19548 KB Output is correct
20 Correct 24 ms 13400 KB Output is correct
21 Correct 23 ms 12968 KB Output is correct
22 Correct 44 ms 19084 KB Output is correct
23 Correct 46 ms 17496 KB Output is correct
24 Correct 50 ms 17696 KB Output is correct
25 Correct 46 ms 22616 KB Output is correct
26 Correct 48 ms 18768 KB Output is correct
27 Correct 45 ms 17744 KB Output is correct
28 Correct 19 ms 11048 KB Output is correct
29 Correct 35 ms 13944 KB Output is correct
30 Correct 34 ms 14256 KB Output is correct
31 Correct 34 ms 14676 KB Output is correct
32 Correct 39 ms 17232 KB Output is correct