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Submission #238389

# Submission time Handle Problem Language Result Execution time Memory
238389 2020-06-11T00:25:24 Z luciocf Strange Device (APIO19_strange_device) C++14
100 / 100
 820 ms 33596 KB 
// APIO 2019 - Strange Device
// Lúcio Cardoso


#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

typedef long long ll;
typedef pair<ll, int> pii;

const int maxn = 3e6+10;
const ll inf = 1e18;

int n;
ll A, B, p;

vector<pii> event;

void add_event(ll l, ll r)
{
	if (p <= inf/B)
		l %= (p*B), r %= (p*B);

	if (l <= r)
	{
		event.push_back({l, 0});
		event.push_back({r, 1});
	}
	else
	{
		event.push_back({l, 0});
		event.push_back({p*B-1ll, 1});

		event.push_back({0, 0});
		event.push_back({r, 1});
	}
}

int main(void)
{
	scanf("%d %lld %lld", &n, &A, &B);

	ll g = __gcd(A, B+1);
	p = A/g;

	bool flag = 0;

	for (int i = 1; i <= n; i++)
	{
		ll l, r;
		scanf("%lld %lld", &l, &r);

		if ((r-l+1)/p >= B)
			flag = 1;

		add_event(l, r);
	}

	if (flag)
	{
		printf("%lld\n", p*B);
		return 0;
	}

	ll prev, ans = 0;
	int open = 0;

	sort(event.begin(), event.end());

	for (auto E: event)
	{
		ll x = E.ff, type = E.ss;

		if (open == 0) prev = x;

		if (type == 0) open++;
		else open--;

		if (open == 0) ans += (x-prev+1ll);
	}

	printf("%lld\n", ans);
}

Compilation message

strange_device.cpp: In function 'int main()':
strange_device.cpp:45:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %lld %lld", &n, &A, &B);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:55:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld", &l, &r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 256 KB Output is correct
2 Correct 11 ms 1276 KB Output is correct
3 Correct 11 ms 1276 KB Output is correct
4 Correct 4 ms 256 KB Output is correct
5 Correct 4 ms 256 KB Output is correct
6 Correct 4 ms 256 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 4 ms 256 KB Output is correct
9 Correct 5 ms 256 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 256 KB Output is correct
12 Correct 4 ms 256 KB Output is correct
13 Correct 4 ms 256 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 5 ms 256 KB Output is correct
16 Correct 12 ms 1276 KB Output is correct
17 Correct 77 ms 4844 KB Output is correct
18 Correct 5 ms 256 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 4 ms 256 KB Output is correct
3 Correct 5 ms 256 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 256 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 6 ms 384 KB Output is correct
4 Correct 6 ms 384 KB Output is correct
5 Correct 510 ms 33340 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 649 ms 33332 KB Output is correct
3 Correct 671 ms 33340 KB Output is correct
4 Correct 639 ms 33368 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 649 ms 33332 KB Output is correct
3 Correct 671 ms 33340 KB Output is correct
4 Correct 639 ms 33368 KB Output is correct
5 Correct 4 ms 256 KB Output is correct
6 Correct 666 ms 33596 KB Output is correct
7 Correct 669 ms 33340 KB Output is correct
8 Correct 649 ms 33340 KB Output is correct
9 Correct 791 ms 33340 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 649 ms 33332 KB Output is correct
3 Correct 671 ms 33340 KB Output is correct
4 Correct 639 ms 33368 KB Output is correct
5 Correct 4 ms 256 KB Output is correct
6 Correct 69 ms 4976 KB Output is correct
7 Correct 70 ms 4964 KB Output is correct
8 Correct 63 ms 4968 KB Output is correct
9 Correct 68 ms 4968 KB Output is correct
10 Correct 67 ms 4968 KB Output is correct
11 Correct 71 ms 4976 KB Output is correct
12 Correct 65 ms 4976 KB Output is correct
13 Correct 75 ms 4968 KB Output is correct
14 Correct 67 ms 4968 KB Output is correct
15 Correct 76 ms 4968 KB Output is correct
16 Correct 72 ms 4964 KB Output is correct
17 Correct 67 ms 4968 KB Output is correct
18 Correct 676 ms 33340 KB Output is correct
19 Correct 626 ms 33468 KB Output is correct
20 Correct 758 ms 33340 KB Output is correct
21 Correct 77 ms 4968 KB Output is correct
22 Correct 60 ms 4968 KB Output is correct
23 Correct 225 ms 17316 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 73 ms 4964 KB Output is correct
3 Correct 75 ms 4840 KB Output is correct
4 Correct 820 ms 33412 KB Output is correct
5 Correct 78 ms 4968 KB Output is correct
6 Correct 71 ms 4964 KB Output is correct
7 Correct 72 ms 4964 KB Output is correct
8 Correct 77 ms 5096 KB Output is correct
9 Correct 69 ms 4968 KB Output is correct
10 Correct 75 ms 4968 KB Output is correct
11 Correct 75 ms 4968 KB Output is correct
12 Correct 65 ms 4968 KB Output is correct
13 Correct 75 ms 4968 KB Output is correct
14 Correct 808 ms 33352 KB Output is correct
15 Correct 77 ms 4968 KB Output is correct
16 Correct 630 ms 33340 KB Output is correct
17 Correct 675 ms 33340 KB Output is correct
18 Correct 5 ms 256 KB Output is correct

Subtask #8
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 256 KB Output is correct
2 Correct 11 ms 1276 KB Output is correct
3 Correct 11 ms 1276 KB Output is correct
4 Correct 4 ms 256 KB Output is correct
5 Correct 4 ms 256 KB Output is correct
6 Correct 4 ms 256 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 4 ms 256 KB Output is correct
9 Correct 5 ms 256 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 256 KB Output is correct
12 Correct 4 ms 256 KB Output is correct
13 Correct 4 ms 256 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 5 ms 256 KB Output is correct
16 Correct 12 ms 1276 KB Output is correct
17 Correct 77 ms 4844 KB Output is correct
18 Correct 5 ms 256 KB Output is correct
19 Correct 5 ms 256 KB Output is correct
20 Correct 4 ms 256 KB Output is correct
21 Correct 5 ms 256 KB Output is correct
22 Correct 5 ms 256 KB Output is correct
23 Correct 5 ms 256 KB Output is correct
24 Correct 5 ms 256 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 6 ms 384 KB Output is correct
27 Correct 6 ms 384 KB Output is correct
28 Correct 510 ms 33340 KB Output is correct
29 Correct 5 ms 256 KB Output is correct
30 Correct 649 ms 33332 KB Output is correct
31 Correct 671 ms 33340 KB Output is correct
32 Correct 639 ms 33368 KB Output is correct
33 Correct 4 ms 256 KB Output is correct
34 Correct 666 ms 33596 KB Output is correct
35 Correct 669 ms 33340 KB Output is correct
36 Correct 649 ms 33340 KB Output is correct
37 Correct 791 ms 33340 KB Output is correct
38 Correct 4 ms 256 KB Output is correct
39 Correct 69 ms 4976 KB Output is correct
40 Correct 70 ms 4964 KB Output is correct
41 Correct 63 ms 4968 KB Output is correct
42 Correct 68 ms 4968 KB Output is correct
43 Correct 67 ms 4968 KB Output is correct
44 Correct 71 ms 4976 KB Output is correct
45 Correct 65 ms 4976 KB Output is correct
46 Correct 75 ms 4968 KB Output is correct
47 Correct 67 ms 4968 KB Output is correct
48 Correct 76 ms 4968 KB Output is correct
49 Correct 72 ms 4964 KB Output is correct
50 Correct 67 ms 4968 KB Output is correct
51 Correct 676 ms 33340 KB Output is correct
52 Correct 626 ms 33468 KB Output is correct
53 Correct 758 ms 33340 KB Output is correct
54 Correct 77 ms 4968 KB Output is correct
55 Correct 60 ms 4968 KB Output is correct
56 Correct 225 ms 17316 KB Output is correct
57 Correct 5 ms 256 KB Output is correct
58 Correct 73 ms 4964 KB Output is correct
59 Correct 75 ms 4840 KB Output is correct
60 Correct 820 ms 33412 KB Output is correct
61 Correct 78 ms 4968 KB Output is correct
62 Correct 71 ms 4964 KB Output is correct
63 Correct 72 ms 4964 KB Output is correct
64 Correct 77 ms 5096 KB Output is correct
65 Correct 69 ms 4968 KB Output is correct
66 Correct 75 ms 4968 KB Output is correct
67 Correct 75 ms 4968 KB Output is correct
68 Correct 65 ms 4968 KB Output is correct
69 Correct 75 ms 4968 KB Output is correct
70 Correct 808 ms 33352 KB Output is correct
71 Correct 77 ms 4968 KB Output is correct
72 Correct 630 ms 33340 KB Output is correct
73 Correct 675 ms 33340 KB Output is correct
74 Correct 5 ms 256 KB Output is correct
75 Correct 5 ms 256 KB Output is correct
76 Correct 5 ms 384 KB Output is correct
77 Correct 4 ms 384 KB Output is correct
78 Correct 5 ms 256 KB Output is correct
79 Correct 10 ms 1404 KB Output is correct
80 Correct 772 ms 33332 KB Output is correct
81 Correct 773 ms 33292 KB Output is correct
82 Correct 727 ms 33468 KB Output is correct
83 Correct 723 ms 33532 KB Output is correct
84 Correct 722 ms 33356 KB Output is correct
85 Correct 729 ms 33340 KB Output is correct
86 Correct 223 ms 16976 KB Output is correct
87 Correct 5 ms 256 KB Output is correct