oj.uz

Submission #420413

# Submission time Handle Problem Language Result Execution time Memory
420413 2021-06-08T10:54:59 Z Berted Autobahn (COI21_autobahn) C++14
100 / 100
 124 ms 7340 KB 
#include <iostream>
#include <vector>
#include <algorithm>

#define ll long long
#define pii pair<int, int>
#define fst first
#define snd second

using namespace std;

const int INF = 1e9 + 7;

int N, K, X;
int cur[2];

vector<int> C;
vector<pii> op;
int val[300005];

ll ret = 0;

int main()
{
	ios :: sync_with_stdio(0); cin.tie(0);
	cin >> N >> K >> X;

	C.push_back(-INF); C.push_back(INF);
	for (int i = 0; i < N; i++)
	{
		int L, t, R; cin >> L >> t >> R; L--;
		C.push_back(L); C.push_back(R);
		op.push_back({L, 1});
		op.push_back({R, -1});

		if (L + t < R)
		{
			C.push_back(L + t);
			op.push_back({L + t, 2});
			op.push_back({R, -2});
		}
	}

	sort(C.begin(), C.end());
	C.resize(unique(C.begin(), C.end()) - C.begin());
	sort(op.begin(), op.end());

	int j = 0;
	for (int i = 0; i < C.size(); i++)
	{
		for (; j < op.size() && op[j].fst <= C[i]; j++)
		{
			if (op[j].snd < 0) {cur[-op[j].snd - 1]--;}
			else {cur[op[j].snd - 1]++;}
		}
		if (cur[0] >= K) val[i] = cur[1];
		//cerr << i << ": " << C[i] << " " << cur[0] << " " << cur[1] << "\n";
	}

	j = 0; ll tmp = 0;
	for (int i = 1; i < C.size(); i++)
	{
		while (j < i - 1 && C[i] - C[j] > X)
		{
			ret = max(ret, (ll)(X - C[i - 1] + C[j]) * val[i - 1] + tmp);
			tmp -= (ll)(C[j + 1] - C[j]) * val[j]; j++;
		}
		if (C[i] - C[i - 1] <= X) tmp += (ll)(C[i] - C[i - 1]) * val[i - 1];
		else j++;
		if (j) ret = max(ret, tmp + (ll)(X - C[i] + C[j]) * val[j - 1]);
		else ret = max(ret, tmp);
	}

	cout << ret << "\n";

	return 0;
}

Compilation message

autobahn.cpp: In function 'int main()':
autobahn.cpp:49:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |  for (int i = 0; i < C.size(); i++)
      |                  ~~^~~~~~~~~~
autobahn.cpp:51:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |   for (; j < op.size() && op[j].fst <= C[i]; j++)
      |          ~~^~~~~~~~~~~
autobahn.cpp:61:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |  for (int i = 1; i < C.size(); i++)
      |                  ~~^~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 2 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 2 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 114 ms 7324 KB Output is correct
22 Correct 115 ms 7320 KB Output is correct
23 Correct 124 ms 7340 KB Output is correct
24 Correct 118 ms 7312 KB Output is correct
25 Correct 123 ms 7316 KB Output is correct
26 Correct 121 ms 7304 KB Output is correct
27 Correct 110 ms 7272 KB Output is correct
28 Correct 114 ms 7324 KB Output is correct
29 Correct 122 ms 7248 KB Output is correct