Submission #1251651

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251651		icebear	Gift Exchange (JOI24_ho_t4)	C++20	50 / 100	2596 ms	80148 KiB

Main

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 5e5 + 5;
int n, q, a[N], b[N], ans[N], L[N], R[N];
vector<ii> Q[N];

struct IT {
    int node[N << 4], lazy[N << 4];
    void reset() {
        memset(node, -0x3f, sizeof node);
        memset(lazy, 0, sizeof lazy);
    }

    void pushDown(int id) {
        if (lazy[id]) {
            node[id << 1] = node[id << 1 | 1] = lazy[id];
            lazy[id << 1] = lazy[id << 1 | 1] = lazy[id];
            lazy[id] = 0;
        }
    }

    void update(int id, int l, int r, int u, int v, int k) {
        if (l > v || r < u) return;
        if (u <= l && r <= v) {
            node[id] = k;
            lazy[id] = k;
            return;
        }
        pushDown(id);
        int mid = (l + r) >> 1;
        update(id << 1, l, mid, u, v, k);
        update(id << 1 | 1, mid + 1, r, u, v, k);
        node[id] = max(node[id << 1], node[id << 1 | 1]);
    }

    int getPos(int id, int l, int r, int u, int v) {
        if (l > v || r < u) return -inf;
        if (u <= l && r <= v) return node[id];
        pushDown(id);
        int mid = (l + r) >> 1;
        return max(getPos(id << 1, l, mid, u, v), getPos(id << 1 | 1, mid + 1, r, u, v));
    }
} it;

struct BIT {
    int ft[N];
    void update(int x, int val) {
        for(; x <= n; x += x & -x) ft[x] += val;
    }

    int get(int x) {
        int ans = 0;
        for(; x; x -= x & -x) ans += ft[x];
        return ans;
    }
} bit;

void init(void) {
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n) cin >> b[i];
//    cin >> q;
//    FOR(i, 1, q) {
//        int l, r;
//        cin >> l >> r;
//        Q[r].pb(mp(l, i));
//    }
}

void process(void) {
    FOR(i, 1, n) {
        L[i] = it.getPos(1, 1, 2 * n, b[i], a[i]);
        it.update(1, 1, 2 * n, b[i], a[i], i);
    }

    it.reset();
    FORR(i, n, 1) {
        R[i] = -it.getPos(1, 1, 2 * n, b[i], a[i]);
        it.update(1, 1, 2 * n, b[i], a[i], -i);
        if (R[i] != inf) Q[R[i]].pb(mp(i, -1));
    }

    int q; cin >> q;
    while(q--) {
        int l, r;
        cin >> l >> r;
        bool ok = true;
        FOR(i, l, r) {
            if (L[i] < l && R[i] > r) {
                ok = false;
                break;
            }
        }
        cout << (ok ? "Yes\n" : "No\n");
    }

//    FOR(i, 1, q) cout << (ans[i] > 0 ? "No\n" : "Yes\n");
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:138:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  138 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:139:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 31 / 31
• Subtask 5: 0 / 8
• Subtask 6: 0 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12