Submission #731792

#	Time	Username	Problem	Language	Result	Execution time	Memory
731792		beaboss	Global Warming (CEOI18_glo)	C++14	17 / 100	105 ms	4192 KiB

glo

#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back


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

// const int INF = 1e17;
const int N = 2*1e5 + 10;


int main() {
	
	int n, x;
	cin >> n >> x;

	vi vals(n);
	vi dp(n);
	vi cur;
	for (int i = 0; i < n; i++) {
		cin >> vals[i];
		auto ind = lower_bound(cur.begin(), cur.end(), vals[i]) - cur.begin();

		if (ind == cur.size()) cur.pb(vals[i]);
		else cur[ind] = vals[i];

		dp[i] = cur.size();
	}
	cur.erase(cur.begin(), cur.end());
	int ans = 0;
	for (int i = n-1; i >= 0; i--) {
		int possible = lower_bound(cur.begin(), cur.end(), -vals[i] + x) - cur.begin();
		// cout << i << possible << endl;
		ans = max(ans, dp[i] + possible);

		int ind = lower_bound(cur.begin(), cur.end(), -vals[i]) - cur.begin();
		if (ind == cur.size()) cur.pb(-vals[i]);
		else cur[ind]=-vals[i];


	}
	assert(dp[n-1] == cur.size());
	cout << ans << endl;

	
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:30:11: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |   if (ind == cur.size()) cur.pb(vals[i]);
      |       ~~~~^~~~~~~~~~~~~
glo.cpp:43:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   if (ind == cur.size()) cur.pb(-vals[i]);
      |       ~~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from glo.cpp:1:
glo.cpp:48:17: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  assert(dp[n-1] == cur.size());

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25