Submission #1101100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101100		InvMOD	Bitaro’s Party (JOI18_bitaro)	C++14	14 / 100	60 ms	19020 KiB

bitaro

#include<bits/stdc++.h>

using namespace std;

const int N = 1e5+1;

int n, m, q, node[N];
vector<int> adj[N], rev_adj[N], Q[N];

namespace Sub1{
    bool ckSub(){
        return n <= 1e3;
    }

    const int N = 1e3+1;

    int mx_dist[N], del[N];

    void process()
    {
        for(int cur_q = 1; cur_q <= q; cur_q++){
            for(int v : Q[cur_q]){
                del[v] = cur_q;
            }

            memset(mx_dist, 0, sizeof(mx_dist));
            mx_dist[node[cur_q]] = 1;

            int answer = 0;
            for(int i = node[cur_q]; i >= 1; i--){
                if(!mx_dist[i]) continue;
                if(del[i] != cur_q) answer = max(answer, mx_dist[i]);
                for(int v : rev_adj[i]){
                    mx_dist[v] = max(mx_dist[v], mx_dist[i]+1);
                }
            }
            --answer;
            cout << answer <<"\n";
        }
    }
}

namespace Sub2{
    bool ckSub(){
        return q <= 1;
    }

    const int N = 1e5+1;

    int mx_dist[N], del[N];

    void process()
    {
        for(int cur_q = 1; cur_q <= q; cur_q++){
            for(int v : Q[cur_q]){
                del[v] = cur_q;
            }

            memset(mx_dist, 0, sizeof(mx_dist));
            mx_dist[node[cur_q]] = 1;

            int answer = 0;
            for(int i = node[cur_q]; i >= 1; i--){
                if(!mx_dist[i]) continue;

                if(del[i] != cur_q) answer = max(answer, mx_dist[i]);
                for(int v : rev_adj[i]){
                    mx_dist[v] = max(mx_dist[v], mx_dist[i]+1);
                }
            }
            --answer;
            cout << answer <<"\n";
        }
    }
}

namespace Sub3{

    void process()
    {
        cout << "-1\n";
        return;
    }
}

void solve()
{
    cin >> n >> m >> q;
    for(int i = 1; i <= m; i++){
        int u,v; cin >> u >> v;
        adj[u].push_back(v);
        rev_adj[v].push_back(u);
    }

    for(int i = 1; i <= q; i++){
        cin >> node[i];
        int x; cin >> x;
        for(int j = 1; j <= x; j++){
            int v; cin >> v;
            Q[i].push_back(v);
        }
    }

    if(Sub1::ckSub()){
        Sub1::process();
    }
    else if(Sub2::ckSub()){
        Sub2::process();
    }
    else Sub3::process();
    return;
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }

    solve();
    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int32_t main()':
bitaro.cpp:120:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:121:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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