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Submission #1027273

# Submission time Handle Problem Language Result Execution time Memory
1027273 2024-07-19T03:06:28 Z coldbr3w One-Way Streets (CEOI17_oneway) C++17
60 / 100
 3000 ms 36076 KB 
#pragma GCC optimize("Ofast, unrool-loops")
#include <bits/stdc++.h>
using namespace std;
 
#define ll int
#define pll pair<int, int>
#define pb push_back
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
 
const ll N = 2e5 + 100;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const ll block = 480;
ll n,m,p,timer=0;
struct ccjv{ll v, prv, nxt;};
vector<pll>adj[N];
vector<ccjv>g[N];
ll cmp[N], low[N], num[N], b[N], pa[N];
pll edge[N];
ll cur = 0;
vector<pll>order;
map<pll,ll>dir;
void pre_dfs(ll u, ll par){
    low[u] = num[u] = ++timer;
    for(auto x : adj[u]){
        ll v = x.F, idx = x.S;
        if(idx == par) continue;
        if(num[v]) low[u] = min(low[u], num[v]);
        else{
            pre_dfs(v, idx);
            low[u] = min(low[u], low[v]);
            if(low[v] == num[v]) {
                //cout << "bridge" << ' ' << u << ' ' << v << '\n';
                b[idx] = 1;
            }
        }
    }
}
void dfs_cmp(ll u, ll par){
    cmp[u] = cur;
    for(auto x : adj[u]){
        ll v = x.F, idx = x.S;
        if(idx == par) continue;
        if(b[idx]){
            if(cmp[v]) g[cmp[u]].pb({cmp[v], u, v}), g[cmp[v]].pb({cmp[u], v, u});
        }
        else if(!cmp[v]) dfs_cmp(v, idx);
    }
}
void dfs(ll u, ll par, ll b){
    if(u == b){
        for(auto x : order){
            dir[{x.F, x.S}] = 1;
            dir[{x.S, x.F}] = -1;
        }
    }
    for(auto x : g[u]){
        ll v = x.v;
        if(v == par) continue;
        order.pb({x.prv, x.nxt});
        dfs(v, u, b);
        order.pop_back();
    }
}
void to_thic_cau(){  
    cin >> n >> m;
    for(int i = 1; i <= m;i++){
        ll u,v; cin >> u >> v;
        edge[i] = {u, v};
        adj[u].pb({v, i});
        adj[v].pb({u, i});
    }
    for(int i = 1; i <= n;i++) if(!num[i]) pre_dfs(i, 0);
    for(int i = 1; i <= n;i++){
        if(!cmp[i]){
            ++cur;
            dfs_cmp(i, 0);
        }
    }
    cin >> p;
    for(int i = 1; i <= p;i++){
        ll a,b; cin >> a >> b;
        dfs(cmp[a], 0, cmp[b]);
        order.clear();
    }
    for(int i = 1; i <= m;i++){
        if(!b[i]){
            cout << 'B';
        }
        else{
            if(!dir[{edge[i].F, edge[i].S}]) cout << 'B';
            else if(dir[{edge[i].F, edge[i].S}] == 1) cout << 'R';
            else cout << 'L';
        }
    }
    cout << '\n';
}
 
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll tc = 1;
    //cin >> tc;
    while(tc--) to_thic_cau();
}

Compilation message

oneway.cpp:1:43: warning: bad option '-f unrool-loops' to pragma 'optimize' [-Wpragmas]
    1 | #pragma GCC optimize("Ofast, unrool-loops")
      |                                           ^
oneway.cpp:13:16: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   13 | const ll inf = 1e18;
      |                ^~~~
oneway.cpp:25:26: warning: bad option '-f unrool-loops' to attribute 'optimize' [-Wattributes]
   25 | void pre_dfs(ll u, ll par){
      |                          ^
oneway.cpp:41:26: warning: bad option '-f unrool-loops' to attribute 'optimize' [-Wattributes]
   41 | void dfs_cmp(ll u, ll par){
      |                          ^
oneway.cpp:52:28: warning: bad option '-f unrool-loops' to attribute 'optimize' [-Wattributes]
   52 | void dfs(ll u, ll par, ll b){
      |                            ^
oneway.cpp:67:18: warning: bad option '-f unrool-loops' to attribute 'optimize' [-Wattributes]
   67 | void to_thic_cau(){
      |                  ^
oneway.cpp:101:13: warning: bad option '-f unrool-loops' to attribute 'optimize' [-Wattributes]
  101 | signed main(){
      |             ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 10840 KB Output is correct
2 Correct 3 ms 10840 KB Output is correct
3 Correct 3 ms 11188 KB Output is correct
4 Correct 3 ms 11240 KB Output is correct
5 Correct 6 ms 11100 KB Output is correct
6 Correct 3 ms 11100 KB Output is correct
7 Correct 5 ms 11096 KB Output is correct
8 Correct 4 ms 11100 KB Output is correct
9 Correct 3 ms 11096 KB Output is correct
10 Correct 3 ms 11100 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 10840 KB Output is correct
2 Correct 3 ms 10840 KB Output is correct
3 Correct 3 ms 11188 KB Output is correct
4 Correct 3 ms 11240 KB Output is correct
5 Correct 6 ms 11100 KB Output is correct
6 Correct 3 ms 11100 KB Output is correct
7 Correct 5 ms 11096 KB Output is correct
8 Correct 4 ms 11100 KB Output is correct
9 Correct 3 ms 11096 KB Output is correct
10 Correct 3 ms 11100 KB Output is correct
11 Correct 26 ms 18268 KB Output is correct
12 Correct 30 ms 20012 KB Output is correct
13 Correct 37 ms 21584 KB Output is correct
14 Correct 64 ms 23892 KB Output is correct
15 Correct 70 ms 24680 KB Output is correct
16 Correct 78 ms 28596 KB Output is correct
17 Correct 890 ms 36052 KB Output is correct
18 Correct 306 ms 28752 KB Output is correct
19 Correct 887 ms 36076 KB Output is correct
20 Correct 30 ms 18068 KB Output is correct
21 Correct 38 ms 17948 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 10840 KB Output is correct
2 Correct 3 ms 10840 KB Output is correct
3 Correct 3 ms 11188 KB Output is correct
4 Correct 3 ms 11240 KB Output is correct
5 Correct 6 ms 11100 KB Output is correct
6 Correct 3 ms 11100 KB Output is correct
7 Correct 5 ms 11096 KB Output is correct
8 Correct 4 ms 11100 KB Output is correct
9 Correct 3 ms 11096 KB Output is correct
10 Correct 3 ms 11100 KB Output is correct
11 Correct 26 ms 18268 KB Output is correct
12 Correct 30 ms 20012 KB Output is correct
13 Correct 37 ms 21584 KB Output is correct
14 Correct 64 ms 23892 KB Output is correct
15 Correct 70 ms 24680 KB Output is correct
16 Correct 78 ms 28596 KB Output is correct
17 Correct 890 ms 36052 KB Output is correct
18 Correct 306 ms 28752 KB Output is correct
19 Correct 887 ms 36076 KB Output is correct
20 Correct 30 ms 18068 KB Output is correct
21 Correct 38 ms 17948 KB Output is correct
22 Execution timed out 3054 ms 32356 KB Time limit exceeded
23 Halted 0 ms 0 KB -