Submission #1123307

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123307		Neco_arc	Advertisement 2 (JOI23_ho_t2)	C++20	33 / 100	586 ms	22020 KiB

Main

#include <bits/stdc++.h>

#define ll long long
#define name "Advertisement"
#define all(x) x.begin(), x.end()
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#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) (5e5 + 7)

using namespace std;

int n;
pair<int, int> a[maxn];
vector<int> Comp;


struct IT {
    int st[4 * maxn];

    IT() { memset(st, -60, sizeof st); }

    void update(int x, int val, int id = 1, int l = 1, int r = n) {
        if(l > x || r < x) return;
        if(l == r) return st[id] = val, void();

        int mid = (l + r) >> 1;
        update(x, val, _left), update(x, val, _right);

        st[id] = max(st[id * 2], st[id * 2 + 1]);
    }

    int get(int u, int v, int id = 1, int l = 1, int r = n) {
        if(l > v || r < u) return -2e9;
        if(u <= l && r <= v) return st[id];

        int mid = (l + r) >> 1;
        return max(get(u, v, _left), get(u, v, _right));
    }

} StMax, StMin;

void solve() {

    cin >> n;
    fi(i, 1, n) cin >> a[i].first >> a[i].second;

    fi(i, 1, n) Comp.push_back(a[i].first);

    sort(all(Comp));
    Comp.resize(unique(all(Comp)) - Comp.begin());

    sort(a + 1, a + 1 + n, [](pair<int, int> x, pair<int, int> y) { return x.second > y.second; });

    int ans = 0;

    fi(i, 1, n) {
        int x = a[i].first, e = a[i].second;
        int it = upper_bound(all(Comp), x) - Comp.begin();

        bool ok = 1;
        if( StMax.get(1, it) >= x + e) ok = 0;
        if(-StMin.get(it, n) <= x - e) ok = 0;

        ans += ok;
        StMax.update(it, x + e);
        StMin.update(it, -(x - e));
    }

    cout << ans;

}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

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

    solve();
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 0 / 36
• Subtask 4: 0 / 31