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Submission #140579

# Submission time Handle Problem Language Result Execution time Memory
140579 2019-08-03T15:46:04 Z luciocf Strange Device (APIO19_strange_device) C++14
20 / 100
 5000 ms 524292 KB 
#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

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

int n;
ll A, B;

void solve_1(void)
{
	ll l, r;
	scanf("%lld %lld", &l, &r);

	ll x = (r-l+1)/B;
	ll g = A/__gcd(B+1, A);

	if (x >= g)
		printf("%lld\n", B*g);
	else
		printf("%lld\n", r-l+1);
}

void solve_2(void)
{
	set<ll> st;
	for (int i = 1; i <= n; i++)
	{
		ll l, r;
		scanf("%lld %lld", &l, &r);

		for (ll j = l; j <= r; j++)
			st.insert(j);
	}

	map<pair<ll, ll>, int> mp;

	int ans = 0;

	for (auto t: st)
	{
		ll x = (t + t/B)%A;
		ll y = t%B;

		if (!mp[{x, y}]) ans++;

		mp[{x, y}] = 1;
	}

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

void solve_4(void)
{
	vector<pii> V;

	if (A%2 == 0) A /= 2ll;

	bool ok = 0;

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

		if (r-l+1 >= A)
		{
			ok = 1;
		}
		else
		{
			if (l%A <= r%A)
			{
				V.push_back({l%A, r%A});
			}
			else
			{
				V.push_back({l%A, A-1});
				V.push_back({0, r%A});
			}
		}
	}

	if (ok)
	{
		printf("%lld\n", A);
		return;
	}

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

	ll ans = V[0].ss-V[0].ff+1, last = V[0].ss;

	for (int i = 1; i < V.size(); i++)
	{
		ll l = V[i].ff, r = V[i].ss;

		if (l > last)
		{
			ans += r-l+1;
			last = r;
		}
		else
		{
			if (r > last)
			{
				ans += r-last;
				last = r;
			}
		}
	}

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

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

	if (n == 1)
	{
		solve_1();
		return 0;
	}

	if (B == 1)
	{
		solve_4();
		return 0;
	}

	solve_2();
}

Compilation message

strange_device.cpp: In function 'void solve_4()':
strange_device.cpp:98:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < V.size(); i++)
                  ~~^~~~~~~~~~
strange_device.cpp: In function 'void solve_1()':
strange_device.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld", &l, &r);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
strange_device.cpp: In function 'void solve_2()':
strange_device.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld", &l, &r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~
strange_device.cpp: In function 'void solve_4()':
strange_device.cpp:68:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld", &l, &r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:122:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %lld %lld", &n, &A, &B);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 167 ms 21596 KB Output is correct
3 Correct 262 ms 31508 KB Output is correct
4 Correct 8 ms 1400 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 3 ms 504 KB Output is correct
7 Correct 4 ms 632 KB Output is correct
8 Correct 4 ms 632 KB Output is correct
9 Correct 36 ms 3976 KB Output is correct
10 Correct 2 ms 256 KB Output is correct
11 Correct 2 ms 292 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 256 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 201 ms 21340 KB Output is correct
16 Correct 93 ms 11960 KB Output is correct
17 Correct 131 ms 11428 KB Output is correct
18 Correct 2 ms 256 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 256 KB Output is correct
4 Correct 2 ms 256 KB Output is correct
5 Correct 2 ms 376 KB Output is correct

Subtask #3
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 420 KB Output is correct
2 Correct 523 ms 62548 KB Output is correct
3 Correct 561 ms 61736 KB Output is correct
4 Correct 546 ms 59728 KB Output is correct
5 Runtime error 4672 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 583 ms 16840 KB Output is correct
3 Correct 571 ms 18976 KB Output is correct
4 Correct 548 ms 19048 KB Output is correct

Subtask #5
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 583 ms 16840 KB Output is correct
3 Correct 571 ms 18976 KB Output is correct
4 Correct 548 ms 19048 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Runtime error 4671 ms 524288 KB Execution killed with signal 9 (could be triggered by violating memory limits)
7 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 583 ms 16840 KB Output is correct
3 Correct 571 ms 18976 KB Output is correct
4 Correct 548 ms 19048 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 812 ms 113672 KB Output is correct
7 Runtime error 4755 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Execution timed out 5050 ms 513372 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 167 ms 21596 KB Output is correct
3 Correct 262 ms 31508 KB Output is correct
4 Correct 8 ms 1400 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 3 ms 504 KB Output is correct
7 Correct 4 ms 632 KB Output is correct
8 Correct 4 ms 632 KB Output is correct
9 Correct 36 ms 3976 KB Output is correct
10 Correct 2 ms 256 KB Output is correct
11 Correct 2 ms 292 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 256 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 201 ms 21340 KB Output is correct
16 Correct 93 ms 11960 KB Output is correct
17 Correct 131 ms 11428 KB Output is correct
18 Correct 2 ms 256 KB Output is correct
19 Correct 2 ms 256 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 256 KB Output is correct
22 Correct 2 ms 256 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 2 ms 420 KB Output is correct
25 Correct 523 ms 62548 KB Output is correct
26 Correct 561 ms 61736 KB Output is correct
27 Correct 546 ms 59728 KB Output is correct
28 Runtime error 4672 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)