Submission #366106

#	Time	Username	Problem	Language	Result	Execution time	Memory
366106		Jarif_Rahman	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2100 ms	8172 KiB

bitaro

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
int sq;
vector<bool> bl;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m, q; cin >> n >> m >> q;
    bl.resize(n, 0);
    sq = sqrt(n+0.0);
    vector<vector<int>> v(n);
    for(int i = 0; i < m; i++){
        int a, b; cin >> a >> b; a--, b--;
        v[a].pb(b);
    }
    vector<vector<pair<int, int>>> dps(n);
    for(int i = 0; i < n; i++) dps[i].pb({0, i});
    for(int i = 0; i < n; i++){
        for(int x: v[i]){
            vector<pair<int, int>> c;
            int s1 = dps[i].size(), s2 = dps[x].size();
            for(int aa = 0, bb = 0; aa < s1 || bb < s2;){
                if(aa >= s1){
                    if(!bl[dps[x][bb].sc]) bl[dps[x][bb].sc] = 1, c.pb(dps[x][bb]);
                    bb++;
                }
                else if(bb >= s2){
                    if(!bl[dps[i][aa].sc]) bl[dps[i][aa].sc] = 1, c.pb({dps[i][aa].f+1, dps[i][aa].sc});
                    aa++;
                }
                else if(dps[i][aa].f+1 >= dps[x][bb].f){
                    if(!bl[dps[i][aa].sc]) bl[dps[i][aa].sc] = 1, c.pb({dps[i][aa].f+1, dps[i][aa].sc});
                    aa++;
                }
                else{
                    if(!bl[dps[x][bb].sc]) bl[dps[x][bb].sc] = 1, c.pb(dps[x][bb]);
                    bb++;
                }
            }
            for(int i = 0; i < c.size(); i++) bl[c[i].sc] = 0;
            dps[x] = c;
        }
    }
    vector<bool> busy(n, 0);
    while(q--){
        int tj, yj; cin >> tj >> yj;
        tj--;
        vector<int> cbs(yj);
        for(int &x: cbs) cin >> x, x--, busy[x] = 1;
        if(yj < sq){
            int ans = busy[tj] ? -1 : 0;
            for(auto [c, nd]: dps[tj]) if(!busy[nd]) ans = max(ans, c);
            cout << ans << "\n";
            for(int x: cbs) busy[x] = 0;
            continue;
        }
        vector<int> dp(n, -1);
        for(int i = 0; i < n; i++){
            if(busy[i] && dp[i] == -1) continue;
            dp[i] = max(dp[i], 0);
            for(int x: v[i]) dp[x] = max(dp[x], dp[i]+1);
        }
        cout << dp[tj] << "\n";
        for(int x: cbs) busy[x] = 0;
    }
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:45:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |             for(int i = 0; i < c.size(); i++) bl[c[i].sc] = 0;
      |                            ~~^~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86