Submission #1102876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102876		blackslex	Curtains (NOI23_curtains)	C++17	0 / 100	1 ms	456 KiB

curtains

#include<bits/stdc++.h>
#define lsb(x) (x &(-x))

using namespace std;
using pii = pair<int, int>;

const int N = 5e5 + 5;
int n, m, q, x, y, segm[N * 4], lz[N * 4];

void push (int l, int r, int idx) {
    segm[idx] = max(segm[idx], lz[idx]);
    if (l < r) {
        lz[idx * 2 + 1] = max(lz[idx * 2 + 1], lz[idx]);
        lz[idx * 2 + 2] = max(lz[idx * 2 + 2], lz[idx]);
    }
    lz[idx] = 0;
}

void upd (int l, int r, int idx, int tl, int tr, int val, int ckval) {
    push(l, r, idx);
    if (l > tr || r < tl || segm[idx] < ckval) return;
    if (l >= tl && r <= tr) {
        lz[idx] = max(lz[idx], val);
        push(l, r, idx);
        return;
    }
    int mid = (l + r) >> 1;
    upd(l, mid, idx * 2 + 1, tl, tr, val, ckval);
    upd(mid + 1, r, idx * 2 + 2, tl, tr, val, ckval);
    segm[idx] = max(segm[idx * 2 + 1], segm[idx * 2 + 2]);
}

void upd2 (int l, int r, int idx, int pos, int val) {
    push(l, r, idx);
    if (l == r) return void(segm[idx] = max(segm[idx], val));
    int mid = (l + r) >> 1;
    if (pos <= mid) upd2(l, mid, idx * 2 + 1, pos, val);
    else upd2(mid + 1, r, idx * 2 + 2, pos, val);
    segm[idx] = max(segm[idx * 2 + 1], segm[idx * 2 + 2]);
}

int qr (int l, int r, int idx, int pos) {
    push(l, r, idx);
    if (l == r) return segm[idx];
    int mid = (l + r) >> 1;
    if (pos <= mid) return qr(l, mid, idx * 2 + 1, pos);
    else return qr(mid + 1, r, idx * 2 + 2, pos);
}

int main() {
    scanf("%d %d %d", &n, &m, &q);
    vector<vector<int>> add(n + 5, vector<int>());
    vector<vector<pii>> cq(n + 5, vector<pii>());
    vector<int> ans(q);
    for (int i = 0; i < m; i++) {
        scanf("%d %d", &x, &y);
        add[y].emplace_back(x);
    }
    for (int i = 0; i < q; i++) {
        scanf("%d %d", &x, &y);
        cq[y].emplace_back(x, i);
    }
    for (int i = 1; i <= n; i++) {
        for (auto &e: add[i]) {
            upd(1, n, 0, 1, n, i, e - 1);
            upd2(1, n, 0, e, i);
        }
        for (auto &[x, y]: cq[i]) ans[y] = (qr(1, n, 0, x) == i);
    }
    for (auto &e: ans) printf("%s\n", e ? "YES" : "NO");
}

Compilation message (stderr)

curtains.cpp: In function 'int main()':
curtains.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     scanf("%d %d %d", &n, &m, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
curtains.cpp:56:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~
curtains.cpp:60:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36
• Subtask 6: 0 / 20