Submission #994155

#	Time	Username	Problem	Language	Result	Execution time	Memory
994155		whatthemomooofun1729	Game (IOI14_game)	C++17	100 / 100	259 ms	27220 KiB

game

#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <stack>
#include <map>
#include <queue>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cstring>
#include <cmath>
#include <functional>
#include <cassert>
#include <iomanip>
#include <numeric>
#include <bitset>
#include <sstream>
#include <chrono>
#include <random>

#define ff first
#define ss second
#define PB push_back
#define sz(x) int(x.size())
#define rsz resize
#define fch(xxx, yyy) for (auto xxx : yyy) // abusive notation
#define all(x) (x).begin(),(x).end()
#define eps 1e-9

// more abusive notation (use at your own risk):
// #define int ll

using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vll = vector<ll>;

// debugging
void __print(int x) {std::cerr << x;}
void __print(ll x) {std::cerr << x;} /* remember to uncomment this when not using THE MACRO */
void __print(unsigned x) {std::cerr << x;}
void __print(ull x) {std::cerr << x;}
void __print(float x) {std::cerr << x;}
void __print(double x) {std::cerr << x;}
void __print(ld x) {std::cerr << x;}
void __print(char x) {std::cerr << '\'' << x << '\'';}
void __print(const char *x) {std::cerr << '\"' << x << '\"';}
void __print(const string& x) {std::cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V> void __print(const pair<T, V> &x) {std::cerr << '{'; __print(x.ff); std::cerr << ", "; __print(x.ss); std::cerr << '}';}
template<typename T> void __print(const T& x) {int f = 0; std::cerr << '{'; for (auto &i: x) std::cerr << (f++ ? ", " : ""), __print(i); std::cerr << "}";}
void _print() {std::cerr << "]\n";}
template <typename T, typename... V> void _print(T t, V... v) {__print(t); if (sizeof...(v)) std::cerr << ", "; _print(v...);}
void println() {std::cerr << ">--------------------<" << endl;}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

// templates
template <class T> bool ckmin(T &a, const T &b) {return b<a ? a = b, 1 : 0;}
template <class T> bool ckmax(T &a, const T &b) {return b>a ? a = b, 1 : 0;}
template <class T> using gr = greater<T>;
template <class T> using vc = vector<T>;
template <class T> using p_q = priority_queue<T>;
template <class T> using pqg = priority_queue<T, vc<T>, gr<T>>;
template <class T1, class T2> using pr = pair<T1, T2>;
mt19937_64 rng_ll(chrono::steady_clock::now().time_since_epoch().count());
int rng(int M) {return (int)(rng_ll()%M);} /*returns any random number in [0, M) */

// const variables
constexpr int INF = (int)2e9;
constexpr int MOD = 998244353;
constexpr ll LL_INF = (ll)3e18;
constexpr int mod = (int)1e9 + 7;
constexpr ll inverse = 500000004LL; // inverse of 2 modulo 1e9 + 7

void setIO(const string& str) {// fast input/output
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (str.empty()) return;
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
}

struct DSU {
    int N;
    vi parent, siz;
    vc<vi> s;
    DSU() {}
    DSU(int n) { // assuming ONE INDEXING
        N = n;
        parent.clear(), siz.clear(), s.clear();
        parent.rsz(N+1), siz.rsz(N+1, 1), s.rsz(N+1, vi(N+1, 1));
        for (int i = 1; i <= N; ++i) {
            s[i][i] = 0;
        }
        iota(1 + all(parent), 1);
    }
    int find_set(int v) {
        if (parent[v] == v) return v;
        else return parent[v] = find_set(parent[v]); // LogN
        // if you want O(alpha(N)) implementation, change this to parent[v] = find_set(parent[v])
    }
    bool unite(int a, int b) {
        a = find_set(a), b = find_set(b);
        if (a == b) return false;
        if (siz[a] < siz[b]) swap(a, b);
        parent[b] = a;
        siz[a] += siz[b];
        for (int i = 1; i <= N; ++i) {
            s[a][i] += s[b][i];
            s[i][a] = s[a][i];
        }
        return true;
    }
};

int N;
DSU d = DSU();

void initialize(int n) {
    N = n;
    d = DSU(N);
}

int hasEdge(int u, int v) {
    u++, v++;
    int U = d.find_set(u), V = d.find_set(v);
    d.s[U][V]--;
    d.s[V][U]--;
    if (d.s[U][V] == 0) {
        d.unite(u, v);
        return 1;
    }
    return 0;
}
/*
signed main() { // TIME YOURSELF !!!
    setIO("");
    initialize(10);
    vc<pii> edges;
    for (int i = 1; i <= 10; ++i) {
        for (int j = i+1; j <= 10; ++j) {
            edges.PB({i, j});
        }
    }
    shuffle(all(edges), rng_ll);
    for (int i = 0; i < sz(edges); ++i) {
        debug(edges[i].ff, edges[i].ss);
        debug(hasEdge(edges[i].ff, edges[i].ss));
    }
}
*/
// TLE -> TRY NOT USING DEFINE INT LONG LONG
// CE -> CHECK LINE 45
// 5000 * 5000 size matrices are kinda big (potential mle)
// Do something, start simpler

Compilation message (stderr)

game.cpp: In function 'void setIO(const string&)':
game.cpp:88:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
game.cpp:89:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 27 / 27
• Subtask 3: 58 / 58