제출 #1042226

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1042226		Neco_arc	Joker (BOI20_joker)	C++17	0 / 100	72 ms	10620 KiB

Joker

#include <bits/stdc++.h>
#ifdef LOCAL
#include <bits/debug.hpp>
#endif // LOCAL

#define ll long long
#define all(x) x.begin(), x.end()
#define Neco "Joker"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 2e5 + 7

using namespace std;

const ll mod = 1e9 + 7; //972663749
const ll base = 911382323;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r)(rng);
}

int n, m, q;
int f[maxn];
struct dl { int u, v; } a[maxn];

struct DSU {
    int lab[maxn], col[maxn], bad;
    int *addr[6 * maxn], val[6 * maxn], top;

    DSU() { memset(lab, -1, sizeof lab); }

    void Add(int *a, int b) { if(*a != b) addr[++top] = a, val[top] = *a, *a = b; }
    void RollBack(int Time) { while(top > Time) *addr[top] = val[top], --top; }

    int get_rt(int u) {
        return lab[u] < 0 ? u : get_rt(lab[u]);
    }

    int cl(int u) {
        return lab[u] < 0 ? col[u] : (col[u] ^ cl(lab[u]));
    }

    void uni(int u, int v) {
        int p = get_rt(u), q = get_rt(v);
        if(p == q) {
            Add(&bad, bad | (cl(u) == cl(v)));
            return;
        }

        if(lab[p] > lab[q]) swap(p, q);
        Add(&col[q], col[q] ^ (col[u] == col[v]));
        Add(&lab[p], lab[p] + lab[q]), Add(&lab[q], p);
    }

} Dsu;

void DnC(int l, int r, int optL, int optR) {
    if(l > r) return;
    int mid = (l + r) >> 1, pos = mid + 1;

    int T1 = Dsu.top;
    fid(i, optR, mid + 1) Dsu.uni(a[i].u, a[i].v);

    fi(i, optL, min(mid, optR)) {
        if(i) Dsu.uni(a[i].u, a[i].v);
        if(Dsu.bad) { pos = i; break; }
    }

    f[mid] = pos;
    pos = min(pos, mid);

    Dsu.RollBack(T1);
    fi(i, pos + 1, optR) if(i) Dsu.uni(a[i].u, a[i].v);

    DnC(l, mid - 1, optL, pos);

    Dsu.RollBack(T1);
    fi(i, optL, pos - 1) if(i) Dsu.uni(a[i].u, a[i].v);

    DnC(mid + 1, r, pos, optR);

    Dsu.RollBack(T1);
}

void solve()
{

    cin >> n >> m >> q;
    fi(i, 1, m) {
        int x, y; cin >> x >> y;
        a[i] = {x, y};
    }

    DnC(1, m, 0, m);

    fi(i, 1, q) {
        int l, r; cin >> l >> r;
        cout << (l > f[r] ? "YES\n" : "NO\n");
    }


}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
//    cin >> nTest;


    while(nTest--)
    {
        solve();
    }


    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Joker.cpp: In function 'int main()':
Joker.cpp:119:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  119 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:120:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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