제출 #750658

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
750658		GrindMachine	Joker (BOI20_joker)	C++17	0 / 100	2066 ms	5596 KiB

Joker

// Om Namah Shivaya

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

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "YES" << endl
#define no cout << "NO" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

struct DSU {
    vector<int> par, rankk, siz;
    vector<int> weight;
    bool is_bip;

    DSU() {

    }

    DSU(int n) {
        init(n);
    }

    void init(int n) {
        par = vector<int>(n + 1);
        rankk = vector<int>(n + 1);
        siz = vector<int>(n + 1);
        weight = vector<int>(n + 1);
        is_bip = true;
        rep(i, n + 1) create(i);
    }

    void create(int u) {
        par[u] = u;
        rankk[u] = 0;
        siz[u] = 1;
        weight[u] = 0;
    }

    pii find(int u) {
        if (u == par[u]) return {u,0};
        auto [p, cp] = find(par[u]);
        par[u] = p;
        return {p, cp ^ weight[u]};        
    }

    bool same(int u, int v) {
        return find(u).ff == find(v).ff;
    }

    void merge(int u, int v) {
        auto [pu,cu] = find(u);
        auto [pv,cv] = find(v);

        // debug(pu);
        // debug(pv);
        // debug(cu);
        // debug(cv);

        if(pu == pv){
            if(cu == cv){
                is_bip = false;
            }

            return;
        }

        int w = cu ^ cv ^ 1;
        u = pu, v = pv;

        if (rankk[u] == rankk[v]) rankk[u]++;
        if (rankk[u] < rankk[v]) swap(u, v);

        par[v] = u;
        siz[u] += siz[v];
        weight[v] = w;
    }
};

void solve(int test_case)
{
    int n,m,q; cin >> n >> m >> q;
    vector<pii> edges(m+5);
    rep1(i,m) cin >> edges[i].ff >> edges[i].ss;

    DSU d(n+5);

    while(q--){
        int l,r; cin >> l >> r;
        DSU dsu(n+5);

        rep1(i,m){
            if(i < l or i > r){
                auto [u,v] = edges[i];
                dsu.merge(u,v);
            }
        }

        if(!dsu.is_bip){
            yes;
        }
        else{
            no;
        }
    }
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 8
• Subtask 3: 0 / 25
• Subtask 4: 0 / 10
• Subtask 5: 0 / 22
• Subtask 6: 0 / 29