Submission #1186382

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186382		swishy123	Bitaro’s Party (JOI18_bitaro)	C++20	100 / 100	1064 ms	245480 KiB

bitaro

#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>

using namespace std;

#ifndef template
#ifndef define
 
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second 
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng) 
#define siz(x) (int)x.size()
 
#endif
 
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
 
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
    for (int i = 0; i < v.size(); i++){
        for (int j = 0; j < v[i].size(); j++)
            print(v[i][j]);
        nl;
    }
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
 
#endif
 
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
 
template<typename T> 
void read(vector<T> &v) {
    for (int i = 0; i < v.size(); i++)
        read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
    return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
    if constexpr(sizeof...(args) == 1)
        return vector(n, args...);
    else
        return vector(n, vec(args...));
}

#endif

using namespace std;
const ll inf = 1e18;
const ll def = 1e5+1;
const ll mod = 1e9+9;

using namespace std;

int block = 300;
vector<vector<pi>> best(def);

void solve(){
    int n, m, q;
    read(n, m, q);

    vector<vector<int>> edg(n);
    for (int i = 0; i < m; i++){
        int u, v;
        read(u, v);

        u--; v--;
        edg[v].push_back(u);
    }

    for (int i = 0; i < n; i++)
        best[i].push_back({0, i});

    auto marked = vec(n, 0);
    for (int u = 0; u < n; u++){
        for (int v : edg[u]){
            vector<pi> newbest;
            int j = 0;
            for (int i = 0; i <= best[v].size(); i++){
                while (j < best[u].size() && (i == best[v].size() || best[u][j].x > best[v][i].x + 1)){
                    if (newbest.size() == block)
                        break;
                    if (!marked[best[u][j].y])
                        newbest.push_back(best[u][j]);
                    marked[best[u][j++].y] = 1;
                }
                if (newbest.size() == block || i == best[v].size())  
                    break;
                if (!marked[best[v][i].y])
                    newbest.push_back({best[v][i].x + 1, best[v][i].y});
                marked[best[v][i].y] = 1;
            }
            for (auto it : newbest)
                marked[it.y] = 0;
            best[u] = newbest;
        }   
    }
    while (q--){
        int u, s;
        read(u, s);

        u--;
        vector<int> blocked(s);
        read(blocked);

        for (int x : blocked)
            marked[x - 1] = 1;
        int res = -1;
        if (s < block){
            for (int i = 0; i < best[u].size(); i++){
                if (marked[best[u][i].y])
                    continue;
                res = best[u][i].x;
                break;
            }
        }   
        else{
            auto dp = vec(n, -1);
            for (int i = 0; i < n; i++){
                if (!marked[i])
                    maxi(dp[i], 0);
                for (int v : edg[i]){
                    if (dp[v] == -1)
                        continue;
                    maxi(dp[i], dp[v] + 1);
                }
            }
            res = dp[u];
        }
        for (int x : blocked)
            marked[x - 1] = 0;
        print(res); nl;
    }
}

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

    if (ifstream("input.txt").good()){
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }

    int t = 1;
    while (t--){
        solve();
        nl;
    }

    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int32_t main()':
bitaro.cpp:199:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  199 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:200:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  200 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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