Submission #1112202

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112202		mariaclara	One-Way Streets (CEOI17_oneway)	C++17	30 / 100	3073 ms	10064 KiB

oneway

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
const int MAXN = 1e5 + 5;
#define all(x) x.begin(), x.end();
#define sz(x) (int)x.size()
#define mk make_pair 
#define pb push_back 
#define fr first 
#define sc second 

int n, m, p, comp[MAXN], vis[MAXN];
int A[MAXN], B[MAXN], active[MAXN];
int S[MAXN], E[MAXN];
vector<pii> edges[MAXN];

void dfs(int x, int c) {
    comp[x] = c;
    vis[x] = 1;

    for(auto [viz, ind] : edges[x]) {
        if(active[ind] and !vis[viz])
            dfs(viz,c);
    }
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;
    string ans;

    for(int i = 0; i < m; i++) {
        cin >> A[i] >> B[i];
        edges[A[i]].pb({B[i], i});
        edges[B[i]].pb({A[i], i});
        active[i] = 1;
        ans += 'B';
    }

    cin >> p;
    
    for(int i = 1; i <= p; i++)
        cin >> S[i] >> E[i];

    for(int i = 0; i < m; i++) {
        memset(comp, 0, sizeof(comp));
        memset(vis, 0, sizeof(vis));
        active[i] = 0;

        for(int j = 1, c = 1; j <= n; j++)
            if(!vis[j]) dfs(j, c), c++;

        for(int j = 1; j <= p; j++) {
            if(comp[S[j]] == comp[E[j]]) continue;
            if(comp[A[i]] == comp[S[j]]) ans[i] = 'R';
            else ans[i] = 'L';
        }
        active[i] = 1;
    }

    cout << ans;
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40