Submission #670445

#	Time	Username	Problem	Language	Result	Execution time	Memory
670445		hafo	Bitaro’s Party (JOI18_bitaro)	C++14	7 / 100	2053 ms	261896 KiB

bitaro

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define all(x) x.begin(), x.end()
using namespace std;

template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}

const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 7;
const int oo = 1e9 + 69;
const int sz = 320;

int n, m, q, u, v, t, y, c, id[maxn], d[maxn];
bool vis[maxn];
pa f[sz][maxn], cur[sz];
vector<int> g[maxn], topo, arc[maxn];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    //freopen(TASK".inp", "r", stdin);
    //freopen(TASK".out", "w", stdout);

    cin>>n>>m>>q;
    while(m--) {
        cin>>u>>v;
        g[u].pb(v);
        arc[v].pb(u);
    }

    fill_n(vis, n + 1, 0);
    for(int i = 1; i <= n; i++)
    for(int j = 0; j < sz; j++) f[j][i] = (j == 0 ? make_pair(0, i):make_pair(-oo, -1));
    for(auto u = 1; u <= n; u++) {
        for(auto v:g[u]) {
            fill_n(cur, sz, make_pair(-oo, -1));
            for(int id = 0, i = 0, j = 0; (id < sz && (i < sz || j < sz));) {
                auto a = make_pair(f[i][u].fi + 1, f[i][u].se), b = f[j][v];
                if(j == sz || ( i < sz && a.fi >= b.fi)) {
                    cur[id++] = a;
                    vis[a.se] = 1;
                } else {
                    cur[id++] = b;
                    vis[b.se] = 1;
                }

                while(i < sz && (f[i][u].se == -1 || vis[f[i][u].se])) i++;
                while(j < sz && (f[j][v].se == -1 || vis[f[j][v].se])) j++;
            }
            for(int id = 0; id < sz; id++) {
                f[id][v] = cur[id];
                if(cur[id].se != -1) vis[cur[id].se] = 0;
            }
        }
    }

//    for(int i = 0; i < sz; i++) cout<<f[i][5].fi<<" "<<f[i][5].se<<"\n";
    fill_n(id, n + 1, 0);
    for(int k = 1; k <= q; k++) {
        cin>>t>>y;
        for(int i = 0; i < y; i++) {
            cin>>c;
            id[c] = k;
        }

        if(y >= sz) {
            fill_n(d, n + 1, -1);
            d[t] = 0;
            int ans = -1;
            if(id[t] != k) ans = 0;
            bool ok = 0;

            for(int u = t; u >= 1; u--) {
                if(d[u] == -1) continue;
                for(auto v:arc[u]) {
                    maxi(d[v], d[u] + 1);
                    if(id[v] != k) maxi(ans, d[v]);
                }
            }
            cout<<ans<<"\n";
        } else {
            int ans = -1;
            for(int i = 0; i < sz; i++) {
                int u = f[i][t].se;
                if(u == -1 || id[u] == k || u > t) continue;
                maxi(ans, f[i][t].fi);
            }
            cout<<ans<<"\n";
        }
    }
    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:81:18: warning: unused variable 'ok' [-Wunused-variable]
   81 |             bool ok = 0;
      |                  ^~

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