oj.uz

Submission #729617

# Submission time Handle Problem Language Result Execution time Memory
729617 2023-04-24T09:41:35 Z Sam_a17 Event Hopping (BOI22_events) C++17
50 / 100
 1500 ms 37096 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
using namespace std;

#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif

#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount

#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long

void print(long long t) { cerr << t; }
void print(int t) { cerr << t; }
void print(string t) { cerr << t; }
void print(char t) { cerr << t; }
void print(double t) { cerr << t; }
void print(long double t) { cerr << t; }
void print(unsigned long long t) { cerr << t; }

template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[], V n) { cerr << "["; for (int i = 0; i < n; i++) { print(v[i]); cerr << " "; } cerr << "]"; }
template <class T, class V> void print(pair <T, V> p) { cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}"; }
template <class T> void print(vector <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(set <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(multiset <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T, class V> void print(map <T, V> v) { cerr << "[ "; for (auto i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T, class V> void print(unordered_map <T, V> v) { cerr << "[ "; for (auto i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(deque <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'

// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);

// for grid problems
int dx[8] = { -1,0,1,0,1,-1,1,-1 };
int dy[8] = { 0,1,0,-1,1,1,-1,-1 };

// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
	fastIO();

	if (str == "input") {
		freopen("input.txt", "r", stdin);
		freopen("output.txt", "w", stdout);
	}
	else {
		// freopen("skis.in", "r", stdin);
		// freopen("skis.out", "w", stdout);
	}
}
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 2e5 + 10, M = 5e3 + 10, inf = 1e8, LOG = 18;
int n, q, ord[N];
long long down[N][LOG];

struct node {
	long long l, r;
	long long id;

	bool operator<(const node &y) const { return l < y.l; }
};

vector<node> intervals;

struct segTreeMin {
  vector<pair<long long, int>> mTree;
  int size;
 
  void init(long long n) {
    size = 1;
    while(size < n)  {
      size *= 2;
    }
    mTree.assign(2 * size - 1, {INT64_MAX, -1});
  }
 
  void upd(int u, long long v, int ind, int x, int lx, int rx) { // set value at pos u
    if(rx - lx == 1) {
      mTree[x] = min(mTree[x], make_pair(v, ind));
      return;
    }
 
    int m = (lx + rx) / 2;
    if(u < m) {
      upd(u, v, ind, 2 * x + 1, lx, m);
    }else {
      upd(u, v, ind, 2 * x + 2, m, rx);
    }
    mTree[x] = min(mTree[2 * x + 1], mTree[2 * x + 2]);
  }
 
  void upd(int u, long long v, int ind) {
    upd(u, v, ind, 0, 0, size);
  }
 
  pair<long long, int> qry (int l, int r, int x, int lx, int rx) { // range queries
    if(l >= rx || lx >= r) {
      return {INT64_MAX, -1};
    }
    if(lx >= l && r >= rx) {
      return mTree[x];
    }
 
    int m = (rx + lx) / 2;
    auto s1 = qry(l, r, 2 * x + 1, lx, m);
    auto s2 = qry(l, r, 2 * x + 2, m, rx);
    return min(s1, s2);
  }
 
  auto qry(int l, int r) {
    return qry(l, r, 0, 0, size);
  }
};

segTreeMin seg_min;

void solve_() {
	cin >> n >> q;

	vector<int> compress;
	for(int i = 1; i <= n; i++) {
		int li, ri; cin >> li >> ri;
		intervals.push_back({li, ri, i});
		
		//
		compress.push_back(li);
		compress.push_back(ri);
	}

	sort(all(compress));
	uniq(compress);
	
	sort(all(intervals));

	seg_min.init(sz(compress) + 5);
	for(int i = 0; i < n; i++) {
		intervals[i].l = lower_bound(all(compress), intervals[i].l) - compress.begin() + 1;
		intervals[i].r = lower_bound(all(compress), intervals[i].r) - compress.begin() + 1;
		seg_min.upd(intervals[i].r, intervals[i].l, i);
		ord[intervals[i].id] = i;
	}

	for(int i = 0; i < n; i++) {
		for(int j = 0; j < LOG; j++) {
			down[i][j] = -1;
		}
	}

	for(int i = 1; i < n; i++) {
		auto ans = seg_min.qry(intervals[i].l, intervals[i].r + 1);
		if(ans.first < intervals[i].l) {
			down[i][0] = ans.second;
		}
	}

	for(int i = 1; i < LOG; i++) {
		for(int j = 0; j < n; j++) {
			if(down[j][i - 1] == -1) {
				down[j][i] = -1;
				continue;
			}
			down[j][i] = down[down[j][i - 1]][i - 1];
		}
	}

	for(int i = 0; i < n; i++) {
		dbg(make_pair(intervals[i].l, intervals[i].r))
	}

	while(q--) {
		int x, y; cin >> x >> y;
		x = ord[x], y = ord[y];
		if(x == y) {
			cout << 0 << '\n';
			continue;
		}

		if(intervals[x].r == intervals[y].r) {
			cout << 1 << '\n';
			continue;
		}

		if(intervals[x].r > intervals[y].r) {
			cout << "impossible" << '\n';
			continue;
		}
		int curr = y, aa = 0;
		for(int i = LOG - 1; i >= 0; i--) {
			if(down[curr][i] == -1) continue;
			if(intervals[down[curr][i]].l > intervals[x].r) {
				curr = down[curr][i];
				aa += 1 << i;
			}
		}

		if(down[curr][0] == -1) {
			if(intervals[curr].l > intervals[x].r) {
				cout << "impossible" << '\n';
			} else {
				cout << aa + 1 << '\n';
			}
		} else {
			aa += 1;
			if(intervals[curr].l > intervals[x].r) {
				cout << aa + 1 << '\n';
			} else {
				cout << aa << '\n';
			}
		}
	}

}

int main() {
	setIO();

	auto solve = [&](int test_case)-> void {
		for (int i = 1; i <= test_case; i++) {
			solve_();
		}
	};

	int test_cases = 1;
	// cin >> test_cases;
	solve(test_cases);

	return 0;
}

Compilation message

events.cpp: In function 'void setIO(std::string)':
events.cpp:69:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |   freopen("input.txt", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:70:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |   freopen("output.txt", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1166 ms 30016 KB Output is correct
3 Correct 1259 ms 29996 KB Output is correct
4 Correct 1321 ms 30008 KB Output is correct
5 Correct 1354 ms 32488 KB Output is correct
6 Correct 1202 ms 32488 KB Output is correct
7 Correct 1231 ms 32496 KB Output is correct
8 Correct 1204 ms 37096 KB Output is correct
9 Correct 1212 ms 37024 KB Output is correct
10 Correct 1258 ms 32644 KB Output is correct
11 Correct 1237 ms 36896 KB Output is correct
12 Correct 1285 ms 32044 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 15 ms 624 KB Output is correct
4 Correct 13 ms 612 KB Output is correct
5 Correct 13 ms 616 KB Output is correct
6 Correct 12 ms 508 KB Output is correct
7 Correct 11 ms 636 KB Output is correct
8 Correct 11 ms 596 KB Output is correct
9 Correct 15 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 15 ms 624 KB Output is correct
4 Correct 13 ms 612 KB Output is correct
5 Correct 13 ms 616 KB Output is correct
6 Correct 12 ms 508 KB Output is correct
7 Correct 11 ms 636 KB Output is correct
8 Correct 11 ms 596 KB Output is correct
9 Correct 15 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 13 ms 604 KB Output is correct
13 Correct 12 ms 596 KB Output is correct
14 Correct 11 ms 596 KB Output is correct
15 Correct 14 ms 596 KB Output is correct
16 Correct 16 ms 596 KB Output is correct
17 Correct 14 ms 596 KB Output is correct
18 Correct 11 ms 468 KB Output is correct
19 Correct 107 ms 3288 KB Output is correct
20 Correct 78 ms 3328 KB Output is correct
21 Correct 91 ms 3568 KB Output is correct
22 Correct 91 ms 3644 KB Output is correct
23 Correct 103 ms 3780 KB Output is correct
24 Correct 95 ms 3764 KB Output is correct
25 Correct 92 ms 3476 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 15 ms 624 KB Output is correct
4 Correct 13 ms 612 KB Output is correct
5 Correct 13 ms 616 KB Output is correct
6 Correct 12 ms 508 KB Output is correct
7 Correct 11 ms 636 KB Output is correct
8 Correct 11 ms 596 KB Output is correct
9 Correct 15 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 12 ms 704 KB Output is correct
13 Correct 11 ms 596 KB Output is correct
14 Correct 11 ms 596 KB Output is correct
15 Correct 17 ms 596 KB Output is correct
16 Correct 12 ms 640 KB Output is correct
17 Correct 12 ms 640 KB Output is correct
18 Correct 16 ms 468 KB Output is correct
19 Correct 1339 ms 30572 KB Output is correct
20 Correct 1198 ms 29812 KB Output is correct
21 Correct 1191 ms 30464 KB Output is correct
22 Correct 1162 ms 34796 KB Output is correct
23 Correct 1241 ms 34768 KB Output is correct
24 Correct 1217 ms 34780 KB Output is correct
25 Correct 1185 ms 25040 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1342 ms 29500 KB Output is correct
2 Correct 1198 ms 30204 KB Output is correct
3 Correct 1249 ms 30264 KB Output is correct
4 Correct 1194 ms 37032 KB Output is correct
5 Correct 1292 ms 32704 KB Output is correct
6 Correct 1269 ms 36648 KB Output is correct
7 Correct 1271 ms 36744 KB Output is correct
8 Correct 1362 ms 36804 KB Output is correct
9 Execution timed out 1502 ms 34768 KB Time limit exceeded
10 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1166 ms 30016 KB Output is correct
3 Correct 1259 ms 29996 KB Output is correct
4 Correct 1321 ms 30008 KB Output is correct
5 Correct 1354 ms 32488 KB Output is correct
6 Correct 1202 ms 32488 KB Output is correct
7 Correct 1231 ms 32496 KB Output is correct
8 Correct 1204 ms 37096 KB Output is correct
9 Correct 1212 ms 37024 KB Output is correct
10 Correct 1258 ms 32644 KB Output is correct
11 Correct 1237 ms 36896 KB Output is correct
12 Correct 1285 ms 32044 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 15 ms 624 KB Output is correct
16 Correct 13 ms 612 KB Output is correct
17 Correct 13 ms 616 KB Output is correct
18 Correct 12 ms 508 KB Output is correct
19 Correct 11 ms 636 KB Output is correct
20 Correct 11 ms 596 KB Output is correct
21 Correct 15 ms 468 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 13 ms 604 KB Output is correct
25 Correct 12 ms 596 KB Output is correct
26 Correct 11 ms 596 KB Output is correct
27 Correct 14 ms 596 KB Output is correct
28 Correct 16 ms 596 KB Output is correct
29 Correct 14 ms 596 KB Output is correct
30 Correct 11 ms 468 KB Output is correct
31 Correct 107 ms 3288 KB Output is correct
32 Correct 78 ms 3328 KB Output is correct
33 Correct 91 ms 3568 KB Output is correct
34 Correct 91 ms 3644 KB Output is correct
35 Correct 103 ms 3780 KB Output is correct
36 Correct 95 ms 3764 KB Output is correct
37 Correct 92 ms 3476 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 12 ms 704 KB Output is correct
41 Correct 11 ms 596 KB Output is correct
42 Correct 11 ms 596 KB Output is correct
43 Correct 17 ms 596 KB Output is correct
44 Correct 12 ms 640 KB Output is correct
45 Correct 12 ms 640 KB Output is correct
46 Correct 16 ms 468 KB Output is correct
47 Correct 1339 ms 30572 KB Output is correct
48 Correct 1198 ms 29812 KB Output is correct
49 Correct 1191 ms 30464 KB Output is correct
50 Correct 1162 ms 34796 KB Output is correct
51 Correct 1241 ms 34768 KB Output is correct
52 Correct 1217 ms 34780 KB Output is correct
53 Correct 1185 ms 25040 KB Output is correct
54 Correct 1342 ms 29500 KB Output is correct
55 Correct 1198 ms 30204 KB Output is correct
56 Correct 1249 ms 30264 KB Output is correct
57 Correct 1194 ms 37032 KB Output is correct
58 Correct 1292 ms 32704 KB Output is correct
59 Correct 1269 ms 36648 KB Output is correct
60 Correct 1271 ms 36744 KB Output is correct
61 Correct 1362 ms 36804 KB Output is correct
62 Execution timed out 1502 ms 34768 KB Time limit exceeded
63 Halted 0 ms 0 KB -