Submission #1102878

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102878		blackslex	Curtains (NOI23_curtains)	C++17	100 / 100	1016 ms	72776 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) {
    push(l, r, idx);
    if (l > tr || r < tl) 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);
    upd(mid + 1, r, idx * 2 + 2, tl, tr, val);
    segm[idx] = min(segm[idx * 2 + 1], segm[idx * 2 + 2]);
}

int qr (int l, int r, int idx, int tl, int tr) {
    push(l, r, idx);
    if (l > tr || r < tl) return 1e9;
    if (l >= tl && r <= tr) return segm[idx];
    int mid = (l + r) >> 1;
    return min(qr(l, mid, idx * 2 + 1, tl, tr), qr(mid + 1, r, idx * 2 + 2, tl, tr));
}

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, e, i, e);
        for (auto &[x, y]: cq[i]) ans[y] = (qr(1, n, 0, x, i) >= x);
    }
    for (auto &e: ans) printf("%s\n", e ? "YES" : "NO");
}

Compilation message (stderr)

curtains.cpp: In function 'int main()':
curtains.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     scanf("%d %d %d", &n, &m, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
curtains.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~
curtains.cpp:51:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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