Submission #1095386

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095386		quanlt206	Railway (BOI17_railway)	C++17	0 / 100	17 ms	7608 KiB

railway

#include<bits/stdc++.h>
#define X first
#define Y second
#define all(x) begin(x), end(x)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define FORD(i, b, a) for(int i = (b); i >= (a); i--)
#define REP(i, a, b) for (int i = (a); i < (b); i++)
#define mxx max_element
#define mnn min_element
#define SQR(x) (1LL * (x) * (x))
#define MASK(i) (1LL << (i))
#define Point Vector
#define left Left
#define right Right
#define div Div

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
typedef pair<db, db> pdb;
typedef pair<ld, ld> pld;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef pair<ll, ll> pll;
typedef pair<ll, pll> plll;
typedef pair<ll, int> pli;
typedef pair<ll, pii> plii;

template<class A, class B>
    bool maximize(A& x, B y) {
        if (x < y) return x = y, true; else return false;
    }
template<class A, class B>
    bool minimize(A& x, B y) {
        if (x > y) return x = y, true; else return false;
    }

/* END OF TEMPLATE */

const int N = 1e5 + 7;

int n, m, k;

vector<pii> v[N];

namespace sub12 {
    bitset<2007> bit[10007];
    pii P[N];
    void dfs(int x, int par) {
        for (auto y : v[x])
            if (y.X != par) {
                P[y.X] = {x, y.Y};
                dfs(y.X, x);
            }
    }
    void update(int x, int y, int w) {
        dfs(x, x);
        while (y != x) {
            bit[P[y].Y].set(w, 1);
            y = P[y].X;
        }
    }
    void Process() {
        for (int t = 1; t <= m; t++) {
            int s;
            cin>>s;
            vector<int> a(s, 0);
            for (auto &x : a) cin>>x;
            for (int i = 1; i < a.size(); i++) update(a[i - 1], a[i], t);
        }
        vector<int> res;
        for (int i = 1; i < n - 1; i++)
            if (bit[i].count() >= k) res.push_back(i);
        cout<<res.size()<<"\n";
        for (auto x : res) cout<<x<<" ";
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>m>>k;
    for (int i = 1; i < n; i++) {
        int x, y;
        cin>>x>>y;
        v[x].push_back({y, i});
        v[y].push_back({x, i});
    }
    if (n <= 10000) {
        sub12::Process();
        return 0;
    }
    return 0;
}

Compilation message (stderr)

railway.cpp: In function 'void sub12::Process()':
railway.cpp:72:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |             for (int i = 1; i < a.size(); i++) update(a[i - 1], a[i], t);
      |                             ~~^~~~~~~~~~
railway.cpp:76:32: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   76 |             if (bit[i].count() >= k) res.push_back(i);
      |                 ~~~~~~~~~~~~~~~^~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 0 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25