Submission #1272455

#	Time	Username	Problem	Language	Result	Execution time	Memory
1272455		tminh	Matryoshka (JOI16_matryoshka)	C++20	0 / 100	1 ms	576 KiB

matryoshka

#include "bits/stdc++.h"
using namespace std;

#define task ""
#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>


#define ep emplace_back
#define pb push_back
#define pf push_front


const ll mod = 1e9 + 7;
const int N = 1e6 + 5;
const int oo = 1e9;

bool START;
// so lan doc sol roi moi biet lam :


int n, q;
pii a[N];


set<pii> s;
vector<int> Q;
vector<pii> upd;

int id = 0;
void add() {
	for (int val : Q) {
		auto it = s.upper_bound(make_pair(val, oo));
		if (it == s.end()) {
			upd.pb(make_pair(val, id++));
		} else {
			int id_ = it->se;
			s.erase(it);
			upd.pb(make_pair(val, id_));
		}
	}
	for (pii sad : upd) s.insert(sad);
	Q.clear();
	upd.clear();
}

inline void solve() {
	while(q--) {
		ll A, B; cin >> A >> B;
		id = 0;
		for (int i = 1; i <= n; ++i) {
			if (a[i].fi >= A && a[i].se <= B) Q.pb(a[i].se);
			if (i == n || a[i].fi != a[i + 1].fi) add();
		}
		cout << id << endl;
		s.clear();
	} 
}


inline void input() {
    cin >> n >> q;
    for (int i = 1; i <= n; ++i) cin >> a[i].fi >> a[i].se;
    return solve();
}
bool END;

int main() {
    if(fopen(task ".inp", "r")) {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
    return 0;
}

Compilation message (stderr)

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 49