oj.uz

Submission #570932

# Submission time Handle Problem Language Result Execution time Memory
570932 2022-05-31T14:48:07 Z bojackduy One-Way Streets (CEOI17_oneway) C++14
100 / 100
 389 ms 49628 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 5 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 6 ms 5204 KB Output is correct
4 Correct 7 ms 5332 KB Output is correct
5 Correct 5 ms 5332 KB Output is correct
6 Correct 5 ms 5204 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 5 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 4 ms 5164 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 6 ms 5204 KB Output is correct
4 Correct 7 ms 5332 KB Output is correct
5 Correct 5 ms 5332 KB Output is correct
6 Correct 5 ms 5204 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 5 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 4 ms 5164 KB Output is correct
11 Correct 171 ms 26316 KB Output is correct
12 Correct 178 ms 27508 KB Output is correct
13 Correct 224 ms 29380 KB Output is correct
14 Correct 208 ms 33688 KB Output is correct
15 Correct 233 ms 35532 KB Output is correct
16 Correct 367 ms 44840 KB Output is correct
17 Correct 311 ms 46240 KB Output is correct
18 Correct 369 ms 44764 KB Output is correct
19 Correct 296 ms 47460 KB Output is correct
20 Correct 195 ms 27080 KB Output is correct
21 Correct 147 ms 26412 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 6 ms 5204 KB Output is correct
4 Correct 7 ms 5332 KB Output is correct
5 Correct 5 ms 5332 KB Output is correct
6 Correct 5 ms 5204 KB Output is correct
7 Correct 4 ms 5460 KB Output is correct
8 Correct 5 ms 5332 KB Output is correct
9 Correct 4 ms 5204 KB Output is correct
10 Correct 4 ms 5164 KB Output is correct
11 Correct 171 ms 26316 KB Output is correct
12 Correct 178 ms 27508 KB Output is correct
13 Correct 224 ms 29380 KB Output is correct
14 Correct 208 ms 33688 KB Output is correct
15 Correct 233 ms 35532 KB Output is correct
16 Correct 367 ms 44840 KB Output is correct
17 Correct 311 ms 46240 KB Output is correct
18 Correct 369 ms 44764 KB Output is correct
19 Correct 296 ms 47460 KB Output is correct
20 Correct 195 ms 27080 KB Output is correct
21 Correct 147 ms 26412 KB Output is correct
22 Correct 342 ms 46588 KB Output is correct
23 Correct 389 ms 45160 KB Output is correct
24 Correct 372 ms 45264 KB Output is correct
25 Correct 316 ms 49628 KB Output is correct
26 Correct 363 ms 46416 KB Output is correct
27 Correct 345 ms 45308 KB Output is correct
28 Correct 69 ms 11936 KB Output is correct
29 Correct 144 ms 27084 KB Output is correct
30 Correct 150 ms 27212 KB Output is correct
31 Correct 179 ms 27516 KB Output is correct
32 Correct 194 ms 32488 KB Output is correct