oj.uz

Submission #681999

# Submission time Handle Problem Language Result Execution time Memory
681999 2023-01-15T07:02:40 Z SanguineChameleon Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 1032 KB 
// BEGIN BOILERPLATE CODE
 
#include <bits/stdc++.h>
using namespace std;
 
#ifdef KAMIRULEZ
	const bool kami_loc = true;
	const long long kami_seed = 69420;
#else
	const bool kami_loc = false;
	const long long kami_seed = chrono::steady_clock::now().time_since_epoch().count();
#endif
 
const string kami_fi = "kamirulez.inp";
const string kami_fo = "kamirulez.out";
mt19937_64 kami_gen(kami_seed);
 
long long rand_range(long long rmin, long long rmax) {
	uniform_int_distribution<long long> rdist(rmin, rmax);
	return rdist(kami_gen);
}
 
long double rand_real(long double rmin, long double rmax) {
	uniform_real_distribution<long double> rdist(rmin, rmax);
	return rdist(kami_gen);
}
 
void file_io(string fi, string fo) {
	if (fi != "" && (!kami_loc || fi == kami_fi)) {
		freopen(fi.c_str(), "r", stdin);
	}
	if (fo != "" && (!kami_loc || fo == kami_fo)) {
		freopen(fo.c_str(), "w", stdout);
	}
}
 
void set_up() {
	if (kami_loc) {
		file_io(kami_fi, kami_fo);
	}
	ios_base::sync_with_stdio(0);
	cin.tie(0);
}
 
void just_do_it();
 
void just_exec_it() {
	if (kami_loc) {
		auto pstart = chrono::steady_clock::now();
		just_do_it();
		auto pend = chrono::steady_clock::now();
		long long ptime = chrono::duration_cast<chrono::milliseconds>(pend - pstart).count();
		string bar(50, '=');
		cout << '\n' << bar << '\n';
		cout << "Time: " << ptime << " ms" << '\n';
	}
	else {
		just_do_it();
	}
}
 
int main() {
	set_up();
	just_exec_it();
	return 0;
}
 
// END BOILERPLATE CODE
 
// BEGIN MAIN CODE
 
const int ms = 1e5 + 20;
int lt[ms];
int rt[ms];
int n;
 
void query() {
	int u, v;
	cin >> u >> v;
	if (u == v) {
		cout << 0 << '\n';
		return;
	}
	int res = 0;
	while (true) {
		res++;
		int best = v;
		for (int i = 1; i <= n; i++) {
			if (lt[v] <= rt[i] && rt[i] <= rt[v]) {
				if (i == u) {
					cout << res << '\n';
					return;
				}
				if (lt[i] < lt[best]) {
					best = i;
				}
			}
		}
		if (best == v) {
			cout << "impossible" << '\n';
			return;
		}
		v = best;
	}
}
 
void just_do_it() {
	int q;
	cin >> n >> q;
	for (int i = 1; i <= n; i++) {
		cin >> lt[i] >> rt[i];
	}
	for (int i = 0; i < q; i++) {
		query();
	}
}
 
// END MAIN CODE

Compilation message

events.cpp: In function 'void file_io(std::string, std::string)':
events.cpp:30:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   freopen(fi.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen(fo.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1587 ms 1032 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 214 ms 340 KB Output is correct
4 Correct 43 ms 340 KB Output is correct
5 Correct 63 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 214 ms 340 KB Output is correct
4 Correct 43 ms 340 KB Output is correct
5 Correct 63 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 207 ms 340 KB Output is correct
13 Correct 42 ms 340 KB Output is correct
14 Correct 62 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Execution timed out 1575 ms 340 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 214 ms 340 KB Output is correct
4 Correct 43 ms 340 KB Output is correct
5 Correct 63 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 203 ms 340 KB Output is correct
13 Correct 43 ms 320 KB Output is correct
14 Correct 63 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Execution timed out 1588 ms 988 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1560 ms 980 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1587 ms 1032 KB Time limit exceeded
3 Halted 0 ms 0 KB -