Submission #1107663

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107663		bLIC	Bitaro’s Party (JOI18_bitaro)	C++17	0 / 100	2070 ms	12292 KiB

bitaro

/**
 *  Author: Anil Byar
**/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

// using namespace __gnu_pbds;
using namespace std;

// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define uniq(v) v.erase(unique(all(v)), v.end())
#define ft first
#define sd second
#define pb push_back
#define eb emplace_back

// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end


typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;

#define dbg if(0)

const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;

void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y, ll mod){if (y==0) return 1;ll ret = power(x, y/2, mod);ret *= ret;ret%=mod;if (y&1) ret *= x;return ret%mod;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2, mod);}

template<class T> bool chmin(T& a, T b){return (a>b?a=b,1:0);}
template<class T> bool chmax(T& a, T b){return (a<b?a=b,1:0);}
template<class T>
istream& operator>>(istream&in, vector<T>&v){
    for (T& x:v) in>>x;
    return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
    for (T& x:v) out<<x<<' ';
    cout<<'\n';
    return out;
}
// use ?: with brackets (?:)
// check for overflow
// think about dp
// Read the statement carefully

const int N = 1e5+5;
const int B = 88;
vi adj[N];
set<pii> s[N];
int ans[N];
bool removed[N], vis[N];


void calcDfs(int node, int par) {
    if (vis[node]) return;
    if (!removed[node]) ans[node] = 0;
    else ans[node] = -INF;
    for (int x:adj[node]) if (x!=par) {
        calcDfs(x, node);
        chmax(ans[node], ans[x] + 1);
    }
}

void solve(){
    int n, m, q;cin>>n>>m>>q;
    for (int i = 0;i<m;i++) {
        int a, b;cin>>a>>b;
        adj[b].push_back(a);
    }
    memset(vis, false, sizeof(vis));
    for (int node = 1;node<=n;node++) {
        s[node].insert({0, node});
        for (int x:adj[node]) {
            for (auto it = s[x].rbegin();it!=s[x].rend();it++) {
                auto y = *it;
                if (sz(s[node])+1<=B) {
                    s[node].insert({y.first + 1, y.second});
                } else {
                    if (s[node].begin()->first < y.first + 1) {
                        s[node].erase(s[node].begin());
                        s[node].insert({y.first + 1, y.second});
                    } else break;
                }
            }
        }
    }

    while (q--) {
        int t, y;cin>>t>>y;
        vi a(y);
        for (int i = 0;i<y;i++) {
            cin>>a[i];
            removed[a[i]] = true;
        }
        if (y<B) {
            bool found = false;
            auto it = s[t].end();
            do {
                it = prev(it);
                if (!removed[it->second] && it->first!=t) {
                    cout<<it->first;
                    found = true;
                    break;
                }
            } while (it!=s[t].begin());
            if (!found) cout<<-1;
        } else {
            for (int i = 1;i<=n;i++) vis[i] = false;
            calcDfs(t, -1);
            cout<<max(-1, ans[t]);
        }
        for (int i = 0;i<y;i++) {
            removed[a[i]] = false;
        }
        cout<<'\n';
    }
    debug(B);
}

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


    int t = 1, i = 1;
    // cin>>t;
    while(t--){
        cerr<<"Test Case: "<<i++<<'\n';
        solve();
        cout<<'\n';
    }

}

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