oj.uz

Submission #570934

# Submission time Handle Problem Language Result Execution time Memory
570934 2022-05-31T14:50:41 Z bojackduy One-Way Streets (CEOI17_oneway) C++14
100 / 100
 299 ms 48116 KB 
#include<bits/stdc++.h>
#define int long long
#define task "task"
#define size() size() * 1ll 
#define all(x) (x).begin(), (x).end()
#define allr(x, sz) (x) + 1, (x) + 1 + sz
#define pb push_back
#define pii pair<int,int>
#define fi first
#define se second
#define MASK(x) (1LL<<(x))
#define BIT(x,i) (((x)>>(i))&1)
#define numbit(x) __builtin_popcountll(x)
 
using namespace std;
 
const int N = 1e5 + 1;
const int M = 1e3 + 1;
const long long mod = 1e9 + 7;
const long long oo = 1e18 + 7;
 
typedef vector<int> vi;
typedef vector<pii> vii;
typedef long long ll;
 
template<class t>
bool mini(t &x,t y) {
    if (x > y) {
       x = y;
       return 1;
    }
return 0;
}
template<class t>
bool maxi(t &x,t y) {
    if (x < y) {
       x = y;
       return 1;
    }
return 0;
}
void file() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    // freopen(task".in", "r", stdin);
    // freopen(task".out", "w", stdout);
return ;
}
 
int n, m, p;
pii e[N];
vii a[N];
vi adj[N];
map<pii, int> mp, mp1;
 
stack<int> st;
int num[N], low[N];
 
void dfs(int u, int chu) {
    st.push(u);
    num[u] = low[u] = ++num[0];
    for (auto v: a[u]) if (v.fi != chu) {
        if (num[v.se]) mini(low[u], num[v.se]); else {
            dfs(v.se, v.fi);
            mini(low[u], low[v.se]);
        }
    }
 
    if (num[u] == low[u]) {
        int v;
        low[0]++;
        do {
            v = st.top(), st.pop();
            num[v] = low[v] = mod + low[0];
        } while (v != u);
    }
}
 
 
int cha[N];
void dfs1(int u, int chu) {
    cha[u] = chu;
    num[u] = 1;
    for (auto v: adj[u]) if (!num[v] && v != chu) {
        dfs1(v, u);
    }
}
 
 
int dp[N];
void dfs2(int u, int chu) {
    num[u] = 0;
    for (auto v: adj[u]) if (num[v] && v != chu) {
        dfs2(v, u);
        dp[u] += dp[v];
    }
}
 
void solve(int test = -1) {
    cin >> n >> m;
    for (int i = 1; i <= m; i++) {
        int x, y;
        cin >> x >> y;
        a[x].pb(pii(i, y));
        a[y].pb(pii(i, x));
        e[i] = pii(x, y);
    }
 
    for (int i = 1; i <= n; i++) if (!num[i])
        dfs(i, 0);
    for (int i = 1; i <= n; i++) {
        num[i] = 0;
        for (auto v: a[i]) {
            if (low[i] != low[v.se]) {
                adj[low[i] - mod].pb(low[v.se] - mod);
            }
        }
    }
    for (int i = 1; i <= low[0]; i++) if (!num[i])
        dfs1(i, 0);
    
    cin >> p;
    for (int i = 1; i <= p; i++) {
        int x, y;
        cin >> x >> y;
        x = low[x] - mod;
        y = low[y] - mod;
        dp[x]++;
        dp[y]--;
    }

    for (int i = 1; i <= low[0]; i++) if (num[i])
        dfs2(i, 0);


    for (int i = 2; i <= low[0]; i++) {
        int u = cha[i];
        mp[pii(i, u)] = dp[i];
        mp[pii(u, i)] = -dp[i];
    }
    
    for (int i = 1; i <= n; i++) {
        for (auto v: a[i]) {
            mp1[pii(i, v.se)] = mp[pii(low[i] - mod, low[v.se] - mod)];
        }
    }
 
    for (int i = 1; i <= m; i++) {
        int u = e[i].fi;
        int v = e[i].se;
        if (mp1[pii(u, v)] == 0) cout << "B"; else {
            if (mp1[pii(u, v)] > 0) cout << "R"; else cout << "L";
        } 
    }
}
 
int32_t main()  {
    file();
    int T = 1;
    // cin >> T;
    for (int i = 1; i <= T; i++) {
        solve(i);
    }
return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 4 ms 5204 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5460 KB Output is correct
6 Correct 4 ms 5300 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 3 ms 5204 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 4 ms 5204 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5460 KB Output is correct
6 Correct 4 ms 5300 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 3 ms 5204 KB Output is correct
11 Correct 132 ms 25296 KB Output is correct
12 Correct 153 ms 26408 KB Output is correct
13 Correct 174 ms 28108 KB Output is correct
14 Correct 220 ms 32508 KB Output is correct
15 Correct 211 ms 34380 KB Output is correct
16 Correct 299 ms 43620 KB Output is correct
17 Correct 259 ms 45104 KB Output is correct
18 Correct 288 ms 43628 KB Output is correct
19 Correct 259 ms 46340 KB Output is correct
20 Correct 123 ms 26020 KB Output is correct
21 Correct 126 ms 25328 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 4 ms 5204 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5460 KB Output is correct
6 Correct 4 ms 5300 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 3 ms 5204 KB Output is correct
11 Correct 132 ms 25296 KB Output is correct
12 Correct 153 ms 26408 KB Output is correct
13 Correct 174 ms 28108 KB Output is correct
14 Correct 220 ms 32508 KB Output is correct
15 Correct 211 ms 34380 KB Output is correct
16 Correct 299 ms 43620 KB Output is correct
17 Correct 259 ms 45104 KB Output is correct
18 Correct 288 ms 43628 KB Output is correct
19 Correct 259 ms 46340 KB Output is correct
20 Correct 123 ms 26020 KB Output is correct
21 Correct 126 ms 25328 KB Output is correct
22 Correct 268 ms 45160 KB Output is correct
23 Correct 286 ms 43612 KB Output is correct
24 Correct 297 ms 43696 KB Output is correct
25 Correct 282 ms 48116 KB Output is correct
26 Correct 281 ms 44720 KB Output is correct
27 Correct 293 ms 43596 KB Output is correct
28 Correct 59 ms 10732 KB Output is correct
29 Correct 143 ms 25580 KB Output is correct
30 Correct 138 ms 25572 KB Output is correct
31 Correct 144 ms 26012 KB Output is correct
32 Correct 202 ms 30912 KB Output is correct