제출 #898406

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
898406		vjudge1	Tourism (JOI23_tourism)	C++17	10 / 100	5080 ms	9216 KiB

tourism

#include <bits/stdc++.h>
using namespace std;



template<class T>
int len(T &a){
    return a.size();
}

using ll = long long;
using pii = pair<int,int>;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
string fileio = "";


mt19937 mt(time(nullptr));
const int mod = 1e9 + 7;
const int inf = 1e9;
const ll infl = 1e18;
const int maxn = 1e5 + 1;



struct Node{
    int l, r, i;
};

struct Sparsemin{


    vector<vector<Node>> t;
    int n, logn;

    void init(int _n){
        n = _n;
        logn = 32 - __builtin_clz(n);
        t.assign(logn, vector<Node> (n));
    }

    Node merge(Node a, Node b){
        if(a.l < b.l) return a;
        if(b.l < a.l) return b;
        if(a.r > b.r) return a;
        if(b.r > a.r) return b;
        if(a.i < b.i) return a;
        return b;
    }

    void build(vector<int> &l, vector<int> &r){
        init(len(l));

        for(int i = 0; i < n; i ++){
            t[0][i] = {l[i], r[i], i};
        }

        for(int j = 1; j < logn; j ++){
            for(int i = 0; i + (1 << j) - 1 < n; i ++){
                t[j][i] = merge(t[j - 1][i], t[j - 1][i + (1 << (j - 1))]);
            }
        }
    }

    int get(int l, int r){
        int k = 31 - __builtin_clz(r - l + 1);
        return merge(t[k][l], t[k][l + (1 << k)]).i;
    }
};



struct Sparsemax{
    vector<vector<Node>> t;
    int n, logn;

    void init(int _n){
        n = _n;
        logn = 32 - __builtin_clz(n);
        t.assign(logn, vector<Node> (n));
    }

    Node merge(Node a, Node b){
        if(a.r > b.r) return a;
        if(b.r > a.r) return b;
        if(a.l < b.l) return a;
        if(b.l < a.l) return b;
        if(a.i > b.i) return a;
        return b;
    }

    void build(vector<int> &l, vector<int> &r){
        init(len(l));

        for(int i = 0; i < n; i ++){
            t[0][i] = {l[i], r[i], i};
        }

        for(int j = 1; j < logn; j ++){
            for(int i = 0; i + (1 << j) - 1 < n; i ++){
                t[j][i] = merge(t[j - 1][i], t[j - 1][i + (1 << (j - 1))]);
            }
        }
    }

    int get(int l, int r){
        int k = 31 - __builtin_clz(r - l + 1);
        //cout << l << ' ' << r << ' ' << k << endl;
        return merge(t[k][l], t[k][r - (1 << k) + 1]).i;
    }
};



void solve(){
    int n, m, q; cin >> n >> m >> q;
    vector<int> sight(m);
    vector<vector<int>> g(n);

    for(int i = 1; i < n; i ++){
        int u, v; cin >> u >> v;
        u --; v --;
        g[u].push_back(v); g[v].push_back(u);
    }

    for(int i = 0; i < m; i ++){
        cin >> sight[i]; sight[i] --;
    }

    vector<int> par(n);
    auto dfs = [&](auto &dfs, int i, int p = -1)->void{
        par[i] = p;
        for(auto u : g[i]){
            if(u == p) continue;
            dfs(dfs, u, i);
        }
    };

    while(q --){
        int l, r; cin >> l >> r;
        l --; r --;
        dfs(dfs, sight[l]);
        int cnt = 1;
        vector<int> vis(n);
        vis[sight[l]] = 1;
        for(int j = l + 1; j <= r; j ++){
            int cur = sight[j];
            while(vis[cur] == 0){
                vis[cur] = 1;
                //cout << "cur " << cur + 1 << endl;
                cnt ++; cur = par[cur];
            }
        }
        cout << cnt << '\n';
    }
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    auto start = chrono::high_resolution_clock::now();
    #ifndef LOCAL
    if(fileio.size()){
        freopen((fileio + ".in").c_str(), "r", stdin);
        freopen((fileio + ".out").c_str(), "w", stdout);
    }
    #endif
    int testcases = 1;
    #ifdef Tests
    cin >> testcases;
    #endif
    while(testcases --){
        solve();
        cout << '\n';
        #ifdef LOCAL
        cout << "_________________________" << endl;
        #endif
    }
    #ifdef LOCAL
    auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
    
    cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
    #endif
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

tourism.cpp: In function 'int main()':
tourism.cpp:161:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
  161 |     auto start = chrono::high_resolution_clock::now();
      |          ^~~~~
tourism.cpp:164:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  164 |         freopen((fileio + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tourism.cpp:165:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  165 |         freopen((fileio + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 41